Fault Code GuidesEngine & Chassis Fault Code Guides: Scan, Know & Fix DTCs – launch SEA

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Powertrain Codes

P0100

Mass Air Flow Circuit Malfunction

P0102

MAF Circuit Low Input

P0113

Intake Air Temp Sensor High Input

P0128

Coolant Thermostat Below Reg Temp

P0171

System Too Lean (Bank 1)

P0172

System Too Rich (Bank 1)

P0201

Injector Circuit Malfunction Cylinder 1

P0300

Random/Multiple Cylinder Misfire

P0301

Cylinder 1 Misfire

P0302

Cylinder 1 Misfire

P0325

Knock Sensor Circuit Malfunction

P0335

Crankshaft Position Sensor Malfunction

P0401

EGR Flow Insufficient

P0420

Catalyst System Efficiency Below Threshold

P0430

Catalyst System Efficiency Below Threshold Bank 2

P0440

EVAP System Malfunction

P0442

EVAP Small Leak Detected

P0455

EVAP Large Leak Detected

P0500

Vehicle Speed Sensor Malfunction

P0700

Transmission Control System Malfunction

C0035

Left Front Wheel Speed Sensor

C0040

Right Front Wheel Speed Sensor

C0045

Left Rear Wheel Speed Sensor

C0050

Right Rear Wheel Speed Sensor

C0110

ABS Pump Motor Circuit

C0161

ABS Brake Switch Circuit

C0200

ABS Motor Circuit

C0241

EBCM Indicated Engine Torque

C0265

ABS Relay Circuit

C0279

ABS Pressure Sensor Fault

C0281

Brake Switch Circuit

C0300

Rear Speed Sensor Malfunction

C0561

System Disabled Information Stored

C0710

Steering Position Signal

C0800

Control Module Power Circuit

C1214

C1214 – Steering Angle Sensor Fault

C1233

Wheel Speed Sensor Rear Left

C1241

Low Battery Voltage

C1252

Brake Booster Sensor Fault

C1280

Yaw Rate Sensor Circuit

B0020

Driver Frontal Deployment Loop

B0028

Passenger Frontal Deployment Loop

B0092

Passenger Presence System Fault

B1000

ECU Malfunction

B1001

Option Configuration Error

B101D

Loss of Communication

B1025

Airbag Module Communication

B1342

ECU Internal Fault

B1402

Driver Power Window Circuit

B1421

Seat Belt Sensor Fault

B1440

Door Lock Circuit

B1500

Turn Signal Circuit

B1600

Immobilizer Communication Fault

B1650

Crash Event Stored

B1760

Seat Position Sensor Fault

B1801

Airbag Igniter Circuit

B2103

Key Transponder Fault

B2470

Climate Control Fault

B2780

Security System Malfunction

B2799

Engine Immobilizer System Fault

U0073

Control Module Communication Bus Off

U0100

Lost Communication With ECM/PCM

U0101

Lost Communication With TCM

U0102

Lost Communication With Transfer Case Module

U0121

Lost Communication With ABS Module

U0140

Lost Communication With BCM

U0155

Lost Communication With Instrument Cluster

U0164

Lost Communication With HVAC

U0184

Lost Communication With Radio

U0200

Lost Communication With Door Module

U023A

Lost Communication With Image Processing Module

U0293

Lost Communication With Hybrid Module

U0401

Invalid Data Received From ECM

U0415

Invalid Data From ABS Module

U0422

Invalid Data From BCM

U1000

CAN Communication Line Fault

U1100

Communication Bus Malfunction

U1120

Lost Wheel Speed Data

U1403

Implausible Fuel Level Signal

U3000

Control Module Internal Fault

Browse by Vehicle System

SRS-2

P0100

The P0100 diagnostic trouble code (DTC) indicates a malfunction in the Mass Air Flow (MAF) sensor circuit. This code is triggered when the Engine Control Module (ECM) detects an abnormal signal from the MAF sensor, which is responsible for measuring the amount of air entering the engine. Accurate airflow data is critical for proper fuel injection and air‑fuel ratio control. When P0100 is present, drivers may experience a check engine light, rough idle, engine hesitation, reduced power, poor fuel economy, or even stalling. Common causes include a faulty MAF sensor, damaged wiring, vacuum leaks, or a contaminated air intake system. Using a professional OBD2 scanner to read live data and perform diagnostic tests is essential to accurately diagnose and fix P0100 engine performance issues.
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P0102

P0102 means the engine control module has detected a low voltage signal from the mass air flow sensor. This often indicates restricted airflow, a dirty MAF sensor, intake leaks, or electrical connection problems. Symptoms may include engine stalling, hesitation during acceleration, and decreased fuel efficiency. A check engine light will usually appear. Diagnosing P0102 requires scanning live data with an advanced diagnostic scan tool to verify airflow readings before replacing parts.
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P0113

The P0113 trouble code indicates the intake air temperature (IAT) sensor is sending a high voltage signal, typically meaning the ECM interprets the intake air as extremely cold. This can affect fuel mixture calculations and overall engine performance. Drivers may experience hard starting, rough idle, or increased fuel consumption. Common causes include a faulty IAT sensor, damaged wiring, or poor electrical connections. An OBD2 scanner can confirm sensor readings and help pinpoint the root cause.
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P0128

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P0128 is triggered when the engine coolant temperature does not reach the proper operating range within a specified time. This usually indicates a stuck‑open thermostat or a faulty coolant temperature sensor. The check engine light may come on, and drivers may notice poor heater performance or reduced fuel economy. Addressing P0128 quickly is important because incorrect engine temperature can affect emissions and long‑term engine health.
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P0171

The P0171 code means the engine is running too lean on Bank 1, indicating too much air and not enough fuel in the air‑fuel mixture. This is a common check engine light issue and may cause rough idle, engine hesitation, misfires, or poor acceleration. Typical causes include vacuum leaks, a weak fuel pump, clogged fuel injectors, or a faulty MAF sensor. Proper diagnosis with a professional OBD2 scan tool and fuel trim analysis is critical before replacing components.
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P0172

P0172 indicates the engine control module has detected a rich fuel condition on Bank 1, meaning too much fuel is being injected compared to available air. Symptoms may include black exhaust smoke, poor fuel economy, rough running, or a strong fuel smell. Common causes include leaking fuel injectors, a faulty oxygen sensor, high fuel pressure, or a malfunctioning MAF sensor. Live data monitoring and fuel trim diagnostics are essential for accurate repair.
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P0300

The P0300 diagnostic trouble code indicates random or multiple cylinder misfires. This is one of the most common causes of a flashing check engine light and can lead to reduced engine performance, shaking, poor acceleration, and potential catalytic converter damage. Causes range from faulty spark plugs and ignition coils to vacuum leaks or fuel delivery issues. Immediate diagnosis with an advanced OBD2 scanner is recommended to prevent further engine damage.
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P0301

P0301 specifically indicates a misfire in cylinder 1. Drivers may notice rough idle, engine vibration, hesitation, or loss of power. Common causes include worn spark plugs, faulty ignition coils, fuel injector problems, or compression issues. Identifying the exact cause requires reading freeze frame data and performing ignition system diagnostics using a professional scan tool.
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P0335

The P0335 code indicates a problem with the crankshaft position sensor circuit. This sensor provides critical timing information for ignition and fuel injection. When faulty, the engine may stall, fail to start, or experience intermittent misfires. The check engine light will illuminate, and the vehicle may not run properly. Diagnosing P0335 involves testing sensor signals, wiring integrity, and ECM communication using a reliable diagnostic scanner.
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P0420

P0420 means the catalytic converter on Bank 1 is not operating at the required efficiency level. This is a very common emissions‑related trouble code and often triggers the check engine light. Symptoms may include reduced fuel efficiency or no noticeable performance issues at all. Causes include a failing catalytic converter, faulty oxygen sensors, exhaust leaks, or engine misfires. Accurate diagnosis requires monitoring upstream and downstream O2 sensor data with a professional OBD2 scan tool before replacing expensive components.
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SRS-3

P0700

The P0700 diagnostic trouble code indicates a general transmission control system malfunction. This code means the Transmission Control Module (TCM) has detected a fault and requested the check engine light to turn on. P0700 itself does not specify the exact transmission problem, but it signals that additional transmission codes are stored. Drivers may experience shifting issues, transmission slipping, delayed engagement, or harsh gear changes. A professional OBD2 scanner capable of accessing the TCM is required to retrieve detailed transmission fault codes and properly diagnose the issue.
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P0715

P0715 indicates a malfunction in the input or turbine speed sensor circuit. This sensor monitors transmission input shaft speed to help control gear shifting and torque converter operation. Symptoms may include erratic shifting, transmission slipping, limp mode activation, or inaccurate speed readings. Common causes include a faulty speed sensor, damaged wiring, or internal transmission problems. Accurate diagnosis requires live transmission data using an advanced diagnostic scan tool.
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P0720

The P0720 trouble code signals a problem with the transmission output speed sensor circuit. This sensor provides vehicle speed data to the TCM and ECM for proper gear ratio control. When faulty, drivers may notice harsh shifting, incorrect speedometer readings, or transmission entering limp mode. Causes may include a failed sensor, wiring issues, or internal transmission damage. Scanning live data with a professional OBD2 scanner is essential for accurate troubleshooting.
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P0730

P0730 indicates that the transmission control module has detected an incorrect gear ratio. This means the actual gear ratio does not match the expected ratio, often due to slipping clutches, low transmission fluid, or internal mechanical wear. Symptoms may include delayed shifting, slipping transmission, poor acceleration, or abnormal engine RPM. Because transmission repair costs can be high, proper diagnosis with a transmission-capable scan tool is critical before replacing parts.
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P0740

P0740 refers to a malfunction in the torque converter clutch (TCC) circuit. The torque converter clutch helps improve fuel efficiency by locking the engine and transmission together at cruising speeds. When this code appears, drivers may experience shuddering, stalling when stopping, or decreased fuel economy. Possible causes include a faulty TCC solenoid, low transmission fluid, or wiring issues. Advanced diagnostics and solenoid testing are recommended to pinpoint the exact transmission problem.
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P0750

The P0750 diagnostic trouble code indicates a malfunction in Shift Solenoid A. Shift solenoids control hydraulic pressure inside the transmission to manage gear changes. When this code is triggered, symptoms may include harsh shifting, transmission stuck in one gear, or limp mode activation. Causes often include a failed solenoid, contaminated transmission fluid, or electrical circuit problems. A professional scan tool can perform active tests to verify solenoid operation before repair.
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P0755

P0755 signals a malfunction in Shift Solenoid B, which plays a critical role in automatic transmission shifting performance. Drivers may experience delayed gear engagement, slipping, or rough shifts. Low transmission fluid, valve body issues, or faulty wiring can trigger this code. Proper diagnosis using an OBD2 scanner with bidirectional control helps confirm whether the solenoid is mechanically or electrically defective.
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P0760

P0760 indicates a fault in Shift Solenoid C. This transmission trouble code may cause improper gear selection, hesitation during acceleration, or reduced drivability. In some cases, the vehicle may enter fail-safe or limp mode to protect the transmission from further damage. Diagnosing P0760 requires checking transmission fluid condition, wiring integrity, and solenoid performance with a professional diagnostic tool.
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P0776

The P0776 code means the pressure control solenoid is not performing within the expected range. This solenoid regulates hydraulic pressure inside the automatic transmission to ensure smooth shifting. Symptoms can include hard shifts, slipping transmission, overheating, or poor acceleration. Causes may include contaminated fluid, valve body issues, or a failing solenoid. Monitoring transmission line pressure data with an advanced scan tool is key to accurate repair.
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P0796

P0796 indicates a performance issue with Pressure Control Solenoid C. This can result in erratic shifting, transmission overheating, or engagement problems when shifting into drive or reverse. Because hydraulic pressure directly affects transmission durability, ignoring this code may lead to costly transmission repairs. A professional OBD2 scanner with transmission diagnostic capability can help confirm solenoid function and prevent unnecessary parts replacement.
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SRS-1

C0035

The C0035 diagnostic trouble code indicates a malfunction in the left front wheel speed sensor circuit. This sensor is a critical part of the anti‑lock braking system (ABS), providing wheel speed data to the ABS module for proper brake pressure control. When this code appears, the ABS light or traction control light may illuminate. Drivers may experience reduced ABS functionality, disabled stability control, or inconsistent braking performance. Common causes include a faulty wheel speed sensor, damaged wiring, corrosion, or debris buildup near the sensor. A professional scan tool with ABS system access is required to properly diagnose and clear this brake system problem.
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C0040

C0040 indicates a fault in the right front wheel speed sensor circuit. The ABS control module relies on accurate wheel speed readings to prevent wheel lockup during hard braking. A failed sensor can trigger the ABS warning light and disable traction control or electronic stability control systems. Symptoms may include pulsating brakes or loss of anti‑lock braking function. Diagnosing this ABS trouble code requires checking live wheel speed data using an advanced OBD2 scanner capable of accessing the ABS module.
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C0045

The C0045 code signals a malfunction in the left rear wheel speed sensor circuit. This issue can cause the ABS light to stay on and may affect brake system safety features such as traction control and stability control. Possible causes include sensor failure, broken tone rings, or damaged wiring harnesses. Since wheel speed sensors directly impact braking performance, prompt diagnosis with a professional ABS scan tool is strongly recommended.
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C0050

C0050 indicates a problem with the right rear wheel speed sensor circuit. When the ABS module detects incorrect or missing speed data from this wheel, it disables anti‑lock braking functionality as a safety precaution. Drivers may notice warning lights on the dashboard and reduced braking system performance in slippery conditions. Inspecting the sensor, tone ring, and electrical connections with the help of a diagnostic scanner is essential for accurate repair.
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C0110

The C0110 diagnostic trouble code refers to a malfunction in the ABS pump motor circuit. The ABS pump motor is responsible for modulating brake pressure during emergency braking situations. When faulty, the ABS warning light will illuminate, and the anti‑lock braking system may become inoperative. Causes may include a failed pump motor, blown fuse, relay failure, or internal ABS module issues. Proper diagnosis requires an advanced diagnostic tool capable of performing ABS active tests.
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C0161

C0161 indicates a malfunction in the brake switch circuit. The brake switch provides critical input to multiple systems, including ABS, traction control, and cruise control. When faulty, drivers may experience ABS warning lights, inoperative cruise control, or brake lights that fail to function correctly. Common causes include a defective brake pedal switch or wiring issues. A scan tool with brake system diagnostics can help verify switch status in real time.
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C0241

The C0241 code means the ABS or traction control module is not receiving proper engine torque data from the engine control module (ECM). Since traction control relies on engine torque reduction to prevent wheel slip, this communication fault can disable stability control systems. The ABS light and traction control warning light may turn on simultaneously. Diagnosing this issue requires scanning both the ABS and engine modules to identify related communication or performance trouble codes.
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C0265

C0265 indicates a malfunction in the ABS relay circuit, which supplies power to the ABS pump motor and control module. When this relay fails, the ABS system may be completely disabled. Drivers will typically see the ABS light illuminated on the dashboard. Causes include a faulty relay, wiring issues, or internal ABS module failure. Testing power and ground circuits with professional diagnostic equipment is necessary for proper repair.
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C0279

The C0279 diagnostic trouble code refers to a malfunction in the ABS brake pressure sensor circuit. This sensor monitors hydraulic brake pressure to ensure accurate modulation during anti‑lock braking operation. A faulty pressure sensor can cause inconsistent braking response and trigger the ABS warning light. Diagnosis involves checking live brake pressure data using an advanced ABS scan tool and inspecting the hydraulic control unit.
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C0561

C0561 indicates that the ABS or stability control system has been disabled due to information received from another control module. This code often appears alongside engine or transmission trouble codes. The vehicle’s traction control and electronic stability control systems may be temporarily shut down as a protective measure. Proper diagnosis requires scanning all vehicle modules with a professional diagnostic scanner to identify the root cause of the brake system warning.
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C0475

The C0475 diagnostic trouble code indicates a malfunction in the steering position sensor circuit. This sensor provides critical steering wheel angle and direction data to the electronic power steering (EPS) system and stability control module. When faulty, drivers may experience steering assist issues, illuminated power steering warning lights, or disabled traction and stability control systems. Common causes include a failed steering position sensor, wiring problems, or calibration errors. Diagnosing C0475 requires a professional scan tool capable of accessing steering system data and performing steering angle sensor recalibration.
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C0545

C0545 refers to a malfunction in the steering wheel torque sensor, which measures the amount of force applied to the steering wheel. This information allows the electronic power steering system to adjust steering assist accordingly. Symptoms may include heavy steering, inconsistent steering feel, or EPS warning lights. Causes often involve sensor failure, internal EPS motor issues, or electrical circuit faults. Advanced diagnostics with a bidirectional scan tool are recommended to properly test steering torque sensor performance.
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C0710

The C0710 code indicates an invalid or missing steering position signal. Since modern vehicles rely on steering angle data for electronic stability control (ESC), lane assist, and traction control systems, this fault can trigger multiple warning lights on the dashboard. Drivers may notice reduced safety system functionality. Proper diagnosis involves scanning the steering control module and verifying real-time steering angle sensor data using a professional diagnostic scanner.
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C0800

C0800 indicates a power supply problem within a chassis or steering control module. Low voltage, blown fuses, weak batteries, or damaged wiring can cause this trouble code. Symptoms may include loss of power steering assist, suspension warning lights, or disabled stability control systems. Because multiple modules may be affected, a full system scan with an advanced OBD2 diagnostic tool is necessary to identify voltage irregularities and communication faults.
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C1095

The C1095 diagnostic trouble code means the steering angle sensor has not been properly initialized or calibrated. This often occurs after wheel alignment, battery replacement, or steering component repair. When this code is active, the ABS and stability control systems may be disabled. Recalibrating the steering angle sensor using a professional scan tool with calibration capability is typically required to restore normal operation.
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C1110

C1110 indicates a malfunction within the electronic suspension control system. Vehicles equipped with adaptive suspension or electronically controlled dampers rely on this system to adjust ride comfort and handling performance. Symptoms may include a suspension warning light, uneven ride height, or reduced ride comfort. Causes can range from faulty suspension sensors to control module failures. Diagnosing this issue requires a scan tool capable of accessing the suspension control module and reading live suspension data.
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C1140

The C1140 code signals a fault in the ride height sensor circuit, commonly found in vehicles with air suspension systems. The ride height sensor monitors vehicle height to maintain proper suspension leveling. When malfunctioning, drivers may notice sagging suspension, uneven ride height, or an air suspension warning message. Proper diagnosis includes inspecting the sensor linkage and checking live data with an advanced chassis diagnostic scanner.
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C1210

C1210 indicates a malfunction in the steering angle sensor circuit, a key component for ABS, traction control, and electronic stability control systems. When this code appears, multiple dashboard warning lights may illuminate, and stability control may be disabled. Causes include sensor failure, damaged wiring, or calibration issues. A professional scan tool with steering angle reset functionality is required for accurate repair.
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C1280

The C1280 diagnostic trouble code refers to a malfunction in the yaw rate sensor circuit. The yaw rate sensor measures vehicle rotation and is critical for electronic stability control and rollover prevention systems. When faulty, drivers may notice traction control and stability control warning lights. Diagnosing C1280 involves scanning the chassis control module and verifying sensor output data using an advanced automotive diagnostic tool.
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C1A20

C1A20 indicates a fault within the air suspension control module. This module manages air compressor operation, ride height adjustments, and suspension leveling. When malfunctioning, symptoms may include suspension warning lights, compressor running continuously, or the vehicle sitting too high or too low. Because air suspension repairs can be costly, accurate diagnosis with a professional scan tool that supports air suspension system diagnostics is essential before replacing components.
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SRS

B0020

The B0020 diagnostic trouble code indicates a low resistance condition in the driver frontal airbag deployment loop (Stage 2). This code will typically trigger the airbag light or SRS warning light on the dashboard. The Supplemental Restraint System (SRS) continuously monitors airbag circuits for proper resistance to ensure safe deployment in the event of a collision. Common causes include damaged wiring, faulty airbag modules, clock spring failure, or poor electrical connections. Diagnosing B0020 requires a professional automotive diagnostic scanner capable of accessing the SRS airbag control module.
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B0028

B0028 indicates a low resistance fault in the passenger frontal airbag deployment loop. When this trouble code is present, the airbag system may be partially disabled, and the airbag warning light will remain illuminated. Causes may include faulty airbag wiring, defective passenger airbag modules, or connector corrosion under the seat area. Because airbag system repairs directly affect vehicle safety, proper diagnosis with an SRS-capable scan tool is essential before replacing components.
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B0092

The B0092 code refers to a malfunction in the passenger presence detection system. This system determines whether the passenger airbag should be enabled or disabled based on seat occupancy. Symptoms may include an illuminated airbag light, incorrect passenger airbag status indicator, or warning messages on the dashboard. Causes often involve a faulty seat weight sensor, wiring issues, or seat module calibration errors. Advanced diagnostics and passenger presence system recalibration may be required using a professional scan tool.
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B0100

B0100 indicates a general malfunction in the driver airbag circuit. The SRS control module has detected abnormal resistance or signal interruption in the deployment loop. This may be caused by a faulty clock spring, loose connectors, or damaged wiring inside the steering column. The airbag warning light will remain on until the issue is repaired and cleared with an SRS diagnostic scanner. Immediate inspection is recommended to maintain proper crash protection functionality.
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B1015

The B1015 trouble code indicates a malfunction in one of the vehicle’s crash impact sensors. These sensors detect collision forces and send signals to the airbag control module to deploy airbags when necessary. If this code is stored, the airbag system may not function properly during an accident. Causes may include sensor failure, water intrusion, or wiring harness damage. Diagnosing crash sensor faults requires an advanced automotive scan tool with SRS system access.
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B1342

B1342 indicates an internal fault within the airbag control module (SRS module). This can occur due to voltage spikes, accident history data storage, or module hardware failure. When this code appears, the airbag light will illuminate and the SRS system may be disabled. In some cases, module reprogramming or replacement is required. A professional diagnostic scanner capable of performing module communication tests is essential for confirming this fault.
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B1402

The B1402 code refers to a malfunction in the driver seat belt pretensioner circuit. The pretensioner tightens the seat belt during a collision to improve occupant safety. A faulty pretensioner circuit can trigger the SRS warning light and reduce crash protection effectiveness. Common causes include wiring issues, connector corrosion, or a failed pretensioner unit. Proper diagnosis with an SRS-compatible scan tool is necessary before replacement.
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B1421

B1421 indicates a fault in the passenger seat belt pretensioner circuit. Like other airbag system trouble codes, this issue will illuminate the airbag warning light and may disable part of the Supplemental Restraint System. Causes often include damaged wiring under the passenger seat or a defective pretensioner assembly. Because seat belt systems are part of the vehicle’s safety system, professional diagnostics are strongly recommended.
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B1650

The B1650 diagnostic trouble code signals a malfunction in the occupant classification system (OCS). This system works with the passenger presence sensor to determine airbag deployment strategy. When faulty, drivers may notice airbag status indicator errors or persistent SRS warning lights. Diagnosis may involve recalibrating the seat sensor or testing the body control module (BCM) communication with an advanced automotive diagnostic scanner.
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B1801

B1801 indicates a fault in the driver airbag squib circuit, meaning the deployment initiator circuit has detected abnormal resistance or signal interruption. This can result from wiring damage, connector issues, or clock spring failure inside the steering wheel. The airbag light will remain illuminated until the problem is properly repaired and cleared using an SRS-capable scan tool. Ensuring proper airbag system functionality is critical for vehicle safety compliance.
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B1000

The B1000 diagnostic trouble code indicates an internal fault within a vehicle control module, commonly the Body Control Module (BCM) or another electronic control unit. When this code appears, drivers may experience multiple electrical issues such as malfunctioning power locks, interior lighting problems, dashboard warning lights, or communication errors. In many cases, the check engine light or airbag light may also illuminate. Causes include voltage spikes, software corruption, or module hardware failure. Diagnosing B1000 requires a professional automotive diagnostic scanner capable of full system module communication and control module programming verification.
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B1025

B1025 indicates a malfunction in one of the airbag impact sensor circuits. The Supplemental Restraint System (SRS) relies on accurate crash sensor signals to deploy airbags during a collision. When this code is stored, the airbag warning light will typically remain illuminated, and the SRS system may be partially disabled. Common causes include faulty crash sensors, wiring damage, or connector corrosion. Proper diagnosis requires an advanced OBD2 scanner with SRS airbag system access to ensure vehicle safety compliance.
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B1370

The B1370 code refers to a malfunction in the ignition switch accessory circuit. This issue may cause intermittent power loss to vehicle accessories such as the radio, dashboard electronics, or climate control system. In some cases, drivers may experience starting problems or erratic electrical behavior. Possible causes include a worn ignition switch, wiring harness damage, or Body Control Module communication issues. A full system diagnostic scan is recommended to identify related electrical faults.
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B1402

B1402 indicates a fault in the driver seat belt pretensioner circuit, which is part of the vehicle’s airbag and Supplemental Restraint System. The pretensioner tightens the seat belt during a collision to improve occupant safety. When this trouble code is present, the airbag light or SRS warning light may turn on. Causes often include damaged wiring under the seat, loose connectors, or a defective pretensioner unit. An SRS-capable diagnostic scanner is required to properly diagnose and clear this safety-related code.
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B1440

The B1440 diagnostic trouble code indicates a malfunction in the windshield wiper motor park switch circuit. This can cause wipers to stop in the wrong position, fail to turn off properly, or operate intermittently. Although not directly related to engine performance, this body electrical issue can affect driving visibility and safety. Common causes include a faulty wiper motor assembly, switch failure, or BCM-related circuit problems. Diagnosis typically involves electrical circuit testing and module scanning with a professional automotive diagnostic tool.
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B1500

B1500 refers to a fault in a vehicle lighting control circuit, often managed by the Body Control Module. Drivers may notice headlight failure, tail light malfunction, dashboard illumination problems, or warning messages related to exterior lighting. Causes include blown bulbs, damaged wiring, relay failure, or BCM communication errors. A full vehicle scan with a professional OBD2 diagnostic scanner can help isolate the specific lighting system fault.
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B1600

The B1600 code indicates a malfunction in the vehicle’s anti-theft or immobilizer system, often referred to as Passive Anti-Theft System (PATS). When triggered, the vehicle may fail to start or display a security warning light on the dashboard. This issue is commonly caused by key transponder problems, faulty immobilizer modules, or communication errors between the key and control module. Advanced diagnostics with an automotive scan tool capable of accessing the immobilizer system are required for accurate troubleshooting.
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B1676

B1676 signals that the vehicle’s system voltage has fallen outside the normal operating range. Low battery voltage, charging system problems, alternator failure, or poor electrical connections may trigger this code. Symptoms can include multiple warning lights, electronic module communication errors, or starting difficulties. Because unstable voltage can affect multiple control modules, a complete system diagnostic scan is recommended to prevent further electrical system damage.
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B2103

The B2103 diagnostic trouble code indicates a malfunction in the rear wiper motor circuit. Drivers may notice the rear wiper not operating, operating continuously, or stopping mid-cycle. This body control system issue can be caused by a faulty wiper motor, blown fuse, wiring problems, or BCM failure. Diagnosing B2103 involves electrical inspection and scanning the body control module using a professional automotive diagnostic scanner.
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P0420

The P0420 trouble code is one of the most common and widely searched OBD2 codes. It indicates that the catalytic converter efficiency on Bank 1 is below the required threshold. When this code appears, the check engine light will illuminate, and the vehicle may fail an emissions test or smog inspection. Common causes include a failing catalytic converter, faulty oxygen (O2) sensors, exhaust leaks, or engine misfire issues. Symptoms may include reduced fuel efficiency, sulfur smell from the exhaust, or poor engine performance. Accurate diagnosis requires monitoring live O2 sensor data using a professional OBD2 scanner before replacing the catalytic converter, as unnecessary replacement can lead to high repair costs.
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B0263

The B0263 diagnostic trouble code indicates a low voltage condition in the HVAC mode door actuator circuit. This actuator controls airflow direction inside the vehicle, such as switching between floor vents, dash vents, and defrost mode. When this code is present, drivers may experience improper airflow distribution, weak cabin heating or cooling performance, or unusual clicking noises behind the dashboard. Common causes include a faulty blend door actuator, wiring issues, or climate control module failure. Diagnosing B0263 requires a professional automotive diagnostic scanner capable of accessing the HVAC control module and performing actuator tests.
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B0408

B0408 refers to a temperature control circuit performance issue within the vehicle’s HVAC system. This can result in inconsistent cabin temperature, no heat, no AC cooling, or automatic climate control malfunction. Possible causes include a faulty temperature blend door actuator, in-car temperature sensor failure, or body control module communication errors. A full system scan using an advanced OBD2 scanner with body and HVAC module access is recommended to accurately pinpoint the fault.
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B0414

The B0414 trouble code indicates a malfunction in the HVAC air recirculation door actuator circuit. When this issue occurs, the vehicle may fail to switch between fresh air and recirculated air modes, reducing climate control efficiency. Drivers might notice fogging windows, reduced AC performance, or abnormal airflow behavior. Diagnosis typically involves testing actuator operation using a bidirectional diagnostic scan tool capable of active HVAC component testing.
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B0424

B0424 signals a malfunction in the cabin temperature sensor circuit. The automatic climate control system relies on accurate sensor input to regulate heating and air conditioning performance. When faulty, interior temperature may fluctuate unpredictably. Causes may include sensor failure, wiring damage, or climate control module faults. Professional automotive electrical diagnostics using a full-system scan tool are recommended to confirm sensor readings and restore HVAC system performance.
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B1001

The B1001 diagnostic trouble code indicates a fault within the airbag control module (SRS module). This issue will typically trigger the airbag warning light or SRS light on the dashboard. Causes can include internal module failure, crash data storage, voltage irregularities, or communication errors. Because the Supplemental Restraint System directly affects occupant safety, diagnosing B1001 requires a professional diagnostic scanner with SRS system access and the ability to read airbag module data.
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B1231

B1231 indicates a malfunction in the vehicle’s anti-theft system or immobilizer system. When this code is stored, the vehicle may not start, or a security warning light may appear on the instrument cluster. Common causes include key transponder failure, damaged antenna ring, or body control module communication errors. Proper troubleshooting requires an advanced automotive scan tool capable of accessing the immobilizer and body control systems.
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B1241

The B1241 trouble code points to a malfunction in the air mix (blend) door actuator circuit. This component regulates the mix of hot and cold air inside the cabin. A faulty actuator may cause temperature imbalance, no heat, or no cold air from vents. Diagnosis typically involves checking actuator operation using a professional OBD2 scanner with HVAC active test capabilities.
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B1346

B1346 indicates a communication fault within the airbag control module or between the SRS module and other vehicle control modules. This can result in an illuminated airbag light and partial system disablement. Causes include CAN bus communication errors, low battery voltage, or module failure. A full vehicle diagnostic scan is necessary to verify module communication status and restore proper SRS functionality.
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B1375

The B1375 diagnostic trouble code indicates a malfunction in the interior lighting or illuminated entry circuit. Drivers may notice dome lights staying on, not turning on, or flickering. Since interior lighting systems are controlled by the Body Control Module (BCM), faults may involve relays, wiring harnesses, or module programming issues. Advanced body system diagnostics are recommended for accurate repair.
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B1479

B1479 refers to a fault in the windshield wiper motor control circuit. Symptoms may include inoperative wipers, intermittent operation, or incorrect parking position. This issue may stem from a faulty wiper motor, damaged wiring, or a failing body control module. Diagnosing B1479 requires electrical circuit testing and scanning the BCM using a professional automotive diagnostic scanner.
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U0073

The U0073 diagnostic trouble code indicates that the vehicle’s CAN Bus communication network (Bus “A”) has been disabled or gone offline. Modern vehicles rely on the Controller Area Network (CAN Bus) system to allow multiple control modules—such as the ECM, BCM, ABS, and airbag module—to communicate with each other. When this code appears, drivers may notice multiple warning lights, loss of power steering assist, transmission issues, or erratic electronic behavior. Common causes include wiring faults, short circuits, low battery voltage, or a failing control module. Diagnosing U0073 requires a professional automotive diagnostic scanner capable of full network communication analysis.
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U0100

U0100 indicates a lost communication error between other control modules and the Engine Control Module (ECM) or Powertrain Control Module (PCM). This can result in a no-start condition, check engine light, transmission malfunction, or multiple system warning lights. Causes often include damaged CAN Bus wiring, module failure, or unstable battery voltage. Because this is a network communication fault code, a full system OBD2 scan tool with CAN Bus diagnostic capability is required to accurately trace the communication breakdown.
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U0101

The U0101 trouble code signals a loss of communication with the Transmission Control Module (TCM). When stored, drivers may experience harsh shifting, limp mode, transmission stuck in one gear, or illuminated check engine and transmission warning lights. This issue is typically related to CAN Bus communication failure, wiring harness damage, or TCM malfunction. Proper diagnosis requires scanning all vehicle modules using an advanced automotive diagnostic tool that supports transmission system diagnostics.
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U0121

U0121 indicates that communication with the ABS control module has been lost. As a result, the ABS warning light, traction control light, and stability control light may illuminate on the dashboard. Anti-lock braking and electronic stability control functions may be disabled. Common causes include ABS module failure, damaged CAN Bus wiring, or low system voltage. A professional scan tool capable of accessing ABS and chassis control modules is essential for accurate troubleshooting.
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U0140

The U0140 diagnostic trouble code refers to lost communication with the Body Control Module (BCM). Since the BCM manages critical systems such as interior lighting, power windows, door locks, and anti-theft systems, this fault may cause widespread electrical malfunctions. Drivers may experience inoperative accessories, security system warnings, or multiple dashboard alerts. Diagnosing U0140 requires a full vehicle network scan and CAN Bus communication test using an advanced OBD2 diagnostic scanner.
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U0155

U0155 indicates that communication has been lost with the instrument panel cluster. Symptoms may include a blank dashboard, non-functioning gauges, warning lights staying on, or inaccurate speedometer readings. Because the instrument cluster communicates with other modules via the CAN Bus system, wiring issues or module failure are common causes. Accurate diagnosis requires scanning the vehicle network with a professional automotive diagnostic tool capable of module communication testing.
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U0401

The U0401 trouble code means that another control module has received invalid or corrupted data from the Engine Control Module (ECM/PCM). This can trigger the check engine light, transmission issues, traction control disablement, or engine performance problems. Causes may include ECM software errors, faulty sensors sending incorrect signals, or CAN Bus interference. Advanced diagnostics using a full-system OBD2 scanner are recommended to analyze live data streams and verify module integrity.
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U0415

U0415 indicates that a control module has received implausible or invalid data from the ABS module. This may cause ABS warning lights, traction control deactivation, or stability control malfunction. In some cases, braking performance may be affected. Common causes include faulty wheel speed sensors, ABS module failure, or CAN network communication errors. Proper troubleshooting requires a scan tool capable of reading ABS live data and performing system diagnostics.
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U1000

The U1000 diagnostic trouble code is a manufacturer-specific CAN communication fault indicating a network line error within the vehicle’s communication system. This may result in intermittent electrical issues, multiple warning lights, no-start conditions, or erratic module behavior. Low battery voltage, loose ground connections, or damaged CAN wiring are common causes. A professional automotive diagnostic scanner with network topology scanning capability is recommended for accurate repair.
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U3000

U3000 refers to an internal control module fault, often related to software corruption, hardware failure, or voltage irregularities. This code may appear in various modules, including ABS, BCM, steering control, or airbag modules. Symptoms depend on the affected system and may include warning lights, system disablement, or drivability concerns. Diagnosing U3000 requires a full-system diagnostic scan, module communication verification, and in some cases, module reprogramming using a professional-grade automotive diagnostic tool.
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