OBD2 Fault Code Library

Free lookup for thousands of OBD2 trouble codes: filter by family, read short meanings, and open deeper articles. Desktop ELM327 scanner with live data and AI guidance.

OBD2 symptoms

Look up diagnostic trouble codes by what the car is doing: misfire, overheating, rough idle, a check engine light, and other common symptoms.

• Engine misfire
• Engine overheating
• Rough idle
• Check engine light
• Poor fuel economy
• Hard starting
• Engine stalling
• Catalytic converter efficiency
• Oxygen sensor fault
• EVAP leak
• Thermostat not reaching temperature
• Lean air-fuel mixture
• Rich air-fuel mixture
• EGR flow fault
• Engine knock
• Charging system
• Throttle position
• Mass airflow sensor
• Turbo underboost
• Coolant temperature sensor
• Transmission fault

• B1416 — Power Window LR Motor Circuit Short To Battery (B1416): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by corroded or loose connectors, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B1417 — OBD2 code B1417 flags a problem with the body electrical system (power window LR motor circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B1418 — OBD2 code B1418 flags a problem with the body electrical system (passenger power window motor circuit failure). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, corroded or loose connectors, body control module (BCM) fault.
• B1419 — Passenger Power Window Motor Circuit Open (B1419): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by blown fuse or failed relay, faulty switch, motor or actuator of the affected system, corroded or loose connectors.
• B1420 — OBD2 code B1420 flags a problem with the body electrical system (passenger power window motor circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, blown fuse or failed relay, damaged wiring in door jambs or wet areas.
• B1421 — B1421 — Passenger Power Window Motor Circuit Short To Ground. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, blown fuse or failed relay, corroded or loose connectors.
• B1422 — Power Window RR Motor Circuit Failure (B1422): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by faulty switch, motor or actuator of the affected system, corroded or loose connectors, blown fuse or failed relay.
• B1423 — Power Window RR Motor Circuit Open (B1423): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by damaged wiring in door jambs or wet areas, corroded or loose connectors, blown fuse or failed relay.
• B1424 — Power Window RR Motor Circuit Short To Battery (B1424): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by corroded or loose connectors, blown fuse or failed relay, damaged wiring in door jambs or wet areas.
• B1425 — OBD2 code B1425 flags a problem with the body electrical system (power window RR motor circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, body control module (BCM) fault, blown fuse or failed relay.
• B1426 — B1426 — Lamp Seat Belt Circuit Short To Battery. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: failed clockspring (driver airbag circuit), SRS control module fault or stored crash data, faulty impact or occupancy sensor.
• B1427 — OBD2 code B1427 flags a problem with the airbag / restraint system (SRS) (lamp seat belt circuit open). Short, gentle driving to a shop is usually possible. Common culprits: faulty impact or occupancy sensor, damaged wiring under seats or in the steering column, SRS control module fault or stored crash data.
• B1428 — OBD2 code B1428 flags a problem with the airbag / restraint system (SRS) (lamp seat belt circuit failure). Short, gentle driving to a shop is usually possible. Common culprits: failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column, depleted backup battery or low system voltage.
• B1429 — Lamp Seat Belt Circuit Short To Ground (B1429): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by failed clockspring (driver airbag circuit), SRS control module fault or stored crash data, faulty impact or occupancy sensor.
• B1430 — Seat Belt Switch Circuit Short To Ground (B1430): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by SRS control module fault or stored crash data, failed clockspring (driver airbag circuit), damaged wiring under seats or in the steering column.
• B1431 — OBD2 code B1431 flags a problem with the ABS / stability control (wiper brake/run relay circuit failure). Short, gentle driving to a shop is usually possible. Common culprits: damaged tone (reluctor) ring on the hub, faulty ABS module or pump motor, blown fuse or low voltage to the ABS module.
• B1432 — Wiper Brake/Run Relay Circuit Short To Battery (B1432): a body electrical fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector, faulty ABS module or pump motor.
• B1433 — OBD2 code B1433 flags a problem with the ABS / stability control (wiper brake/run relay circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: failed wheel speed sensor, damaged tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector.
• B1434 — OBD2 code B1434 flags a problem with the ignition system (wiper hi/low speed relay coil circuit failure). Short, gentle driving to a shop is usually possible. Common culprits: failed ignition coil or coil pack, damaged coil wiring or connector, faulty ignition control circuit in the ECM.
• B1435 — B1435 — Wiper Hi/Low Speed Relay Coil Circuit Open. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: failed ignition coil or coil pack, moisture or oil in the spark plug wells, worn spark plugs or wrong plug gap.
• B1436 — B1436 — Wiper Hi/Low Speed Relay Coil Circuit Short To Battery. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: damaged coil wiring or connector, failed ignition coil or coil pack, faulty ignition control circuit in the ECM.
• B1437 — B1437 — Wiper Hi/Low Speed Relay Coil Circuit Short To Ground. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: failed ignition coil or coil pack, faulty ignition control circuit in the ECM, worn spark plugs or wrong plug gap.
• B1438 — B1438 — Wiper Mode Select Switch Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, blown fuse or failed relay, body control module (BCM) fault.
• B1439 — B1439 — Wiper Mode Select Switch Circuit Open. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: damaged wiring in door jambs or wet areas, blown fuse or failed relay, body control module (BCM) fault.