All OBD2 Diagnostic Codes
Browse our complete database of 16000 diagnostic trouble codes.
B0400: Airbag System Fault
The airbag system has detected a fault, which may prevent the airbags from deploying in the event of a crash. This code is often related to issues with the airbag sensors, wiring, or electronic control unit.
B0401: Climate Control Temperature Sensor Malfunction
The B0401 code indicates a malfunction in the climate control temperature sensor, which is responsible for monitoring the temperature of the air being blown into the vehicle. This malfunction can cause the climate control system to malfunction or not function at all.
B0402: Door Locks Malfunction
The B0402 code indicates a malfunction in the door lock system, which may cause doors to lock or unlock unexpectedly, or fail to lock/unlock at all.
B0403: Power Window Circuit Malfunction
The B0403 code indicates a malfunction in the power window circuit, which can cause windows to malfunction or not function at all.
B0404: Seat Switch Circuit Malfunction
The B0404 code indicates a malfunction in the seat switch circuit, which controls the seat's position, recline, or lumbar support. This code is usually triggered when the seat switch circuit is faulty or damaged.
B0405: Exterior Lighting Malfunction
This code indicates a problem with the exterior lighting system, such as a faulty headlight, taillight, or turn signal.
B0406: Body System Security Malfunction
The B0406 code indicates a malfunction in the vehicle's security system, which may cause issues with door locks, alarm systems, or other security-related functions.
B0407: Audio System Malfunction
The B0407 code indicates a malfunction in the audio system, possibly due to a faulty amplifier, speaker, or wiring issue.
B0408: Airbag System Fault
The B0408 code indicates a fault in the airbag system, likely due to a malfunctioning sensor or wiring issue.
B0409: Climate Control Fan Motor Malfunction
This code indicates a malfunction in the climate control fan motor, which may cause the fan to malfunction or not turn on.
B0410: Door Locks Actuator Malfunction
The B0410 code indicates a malfunction in the door lock actuator, which may prevent the doors from locking or unlocking properly.
B0411: Power Window Relay Circuit Malfunction
The B0411 code indicates a problem with the power window relay circuit, which controls the operation of the windows. This can cause windows to malfunction, fail to open or close, or operate intermittently.
B0412: Seat Position Sensor Circuit Malfunction
The seat position sensor circuit has malfunctioned, preventing the vehicle's computer from accurately monitoring the seat's position and function.
B0413: Turn Signal Lamp Malfunction
The B0413 code indicates a malfunction in the turn signal lamp circuit, which can cause the turn signal lights to malfunction or not function at all.
B0414: Immobilizer System Malfunction
The immobilizer system has detected a malfunction, preventing the vehicle from starting. This code is usually caused by a faulty immobilizer module, key fob, or wiring issues.
B0415: Audio System Fault
The B0415 code indicates a fault in the audio system, likely due to a malfunctioning amplifier or speaker. This can cause poor sound quality, distorted audio, or complete loss of sound.
B0416: Airbag System Fault
The B0416 code indicates a fault in the airbag system, specifically in the passenger seat sensor or wiring.
B0417: Climate Control Fan Motor Fault
The B0417 code indicates a fault in the climate control fan motor circuit, which can cause the fan to malfunction or not turn on.
B0418: Door Locks Actuator Malfunction
The B0418 code indicates a malfunction in the door lock actuator, which may prevent the doors from locking or unlocking properly.
B0419: Power Window Relay Circuit Malfunction
The B0419 code indicates a malfunction in the power window relay circuit, which controls the operation of the windows. This can cause the windows to malfunction or fail to function properly.
B0420: Seat Switch Circuit Malfunction
The B0420 code indicates a malfunction in the seat switch circuit, which controls the seat's position, recline, or lumbar support functions.
B0421: Body Control Module (BCM) Malfunction - Exterior Lighting
The Body Control Module (BCM) has detected a malfunction in the exterior lighting system, which may cause issues with the headlights, taillights, or other exterior lights.
B0422: Body Control Module (BCM) Security System Malfunction
The Body Control Module (BCM) has detected a malfunction in the security system, which may cause the vehicle to be in a locked state or prevent the engine from starting.
B0423: Audio System Malfunction
The B0423 code indicates a malfunction in the audio system, possibly due to a faulty amplifier, speaker, or wiring issue.
B0424: Airbag System Fault
The airbag system has detected a fault, possibly due to a malfunctioning sensor, wiring issue, or faulty airbag module.
B0425: Climate Control Blower Motor Malfunction
The B0425 code indicates a malfunction in the climate control blower motor, which may cause issues with air flow and temperature regulation.
B0426: Door Locks Actuator Circuit Malfunction
The B0426 code indicates a malfunction in the door locks actuator circuit, which prevents the door locks from functioning properly.
B0427: Window Regulator Motor Circuit Malfunction
The B0427 code indicates a problem with the window regulator motor circuit, which controls the movement of the window glass. This can cause the window to malfunction or not move at all.
B0428: Seat Position Sensor Circuit Malfunction
The seat position sensor circuit has malfunctioned, preventing the vehicle's computer from accurately detecting the position of the seat. This can cause issues with seat adjustment, airbag deployment, and other safety features.
B0429: Exterior Lighting Malfunction
This code indicates a problem with the exterior lighting system, such as a faulty headlight, taillight, or turn signal.
B0430: Body System Code - Security System Malfunction
The B0430 code indicates a malfunction in the vehicle's security system, which may cause issues with door locks, alarm systems, or other security-related functions.
B0431: Audio System Malfunction
The B0431 code indicates a malfunction in the audio system, likely due to a faulty amplifier, speaker, or wiring issue.
B0432: Airbag System Fault
The airbag system has detected a fault in the deployment mechanism, possibly due to a wiring issue or faulty sensor.
B0433: Climate Control Blower Motor Fault
This code indicates a fault in the climate control blower motor circuit, which may cause issues with air flow, temperature, or air quality in the vehicle.
B0434: Door Locks Actuator Malfunction
The B0434 code indicates a malfunction in the door lock actuator, which prevents the door locks from functioning properly.
B0435: Power Window Circuit Malfunction
This code indicates a problem with the power window circuit, which may cause one or more windows to malfunction or not function at all.
B0436: Seat Switch Circuit Malfunction
The seat switch circuit is malfunctioning, preventing the driver's seat from functioning properly.
B0437: Body System Code - Malfunction in the Front Fog Light Circuit
This code indicates a malfunction in the front fog light circuit, which can cause the fog lights to malfunction or not function at all.
B0438: Immobilizer System Malfunction
The immobilizer system has malfunctioned, preventing the vehicle from starting or running. This code is typically set when the immobilizer system is not communicating with the engine control module.
B0439: Audio System Malfunction
This code indicates a malfunction in the audio system, which may cause issues with sound quality, volume, or functionality.
B0440: Airbag System Circuit Malfunction
The airbag system is malfunctioning due to a circuit issue, which may prevent the airbags from deploying in the event of an accident.
B0441: Climate Control Temperature Sensor Circuit Malfunction
The B0441 code indicates a malfunction in the climate control temperature sensor circuit, which can cause the air conditioning or heating system to malfunction or not function at all.
B0442: Door Locks Circuit Malfunction
The B0442 code indicates a malfunction in the door locks circuit, which can cause issues with door locking and unlocking functions.
B0443: Power Window Circuit Malfunction
This code indicates a problem with the power window circuit, possibly due to a faulty switch, relay, or wiring issue.
B0444: Seat Switch Circuit Malfunction
The B0444 code indicates a problem with the seat switch circuit, which controls the seat's position and function. This can cause issues with seat adjustment, locking, or even airbag deployment.
B0445: Body Control Module (BCM) Malfunction - Lighting
The Body Control Module (BCM) has detected a malfunction in the lighting system, which may cause issues with the vehicle's exterior lights, such as brake lights, turn signals, or hazard lights.
B0446: Body System Security Malfunction
This code indicates a malfunction in the vehicle's security system, which may cause issues with door locks, alarm systems, or other security-related functions.
B0447: Audio System Malfunction
This code indicates a problem with the audio system, such as faulty wiring, a malfunctioning amplifier, or a problem with the audio control module.
B0448: Airbag System Circuit Malfunction
The airbag system circuit has malfunctioned, preventing the airbag from deploying in the event of a crash. This code is often accompanied by other airbag-related codes.
B0449: Climate Control Actuator Malfunction
The B0449 code indicates a malfunction in the climate control system's actuator, which regulates the flow of air and temperature in the vehicle's cabin.