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

• B1488 — Door Handle Right Front Circuit Open (B1488): 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, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B1489 — Door Handle Right Front Short To Battery (B1489): 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, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B1490 — OBD2 code B1490 flags a problem with the body electrical system (door handle right front short to ground). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B1491 — B1491 — Ignition Cylinder Sensor Circuit Failure. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells, worn spark plugs or wrong plug gap.
• B1492 — OBD2 code B1492 flags a problem with the ignition system (ignition cylinder sensor open circuit). Short, gentle driving to a shop is usually possible. Common culprits: moisture or oil in the spark plug wells, faulty ignition control circuit in the ECM, failed ignition coil or coil pack.
• B1493 — OBD2 code B1493 flags a problem with the ignition system (ignition cylinder sensor battery short). Short, gentle driving to a shop is usually possible. Common culprits: moisture or oil in the spark plug wells, failed ignition coil or coil pack, damaged coil wiring or connector.
• B1494 — B1494 — Ignition Cylinder Sensor Ground Short. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: faulty ignition control circuit in the ECM, failed ignition coil or coil pack, worn spark plugs or wrong plug gap.
• B1495 — B1495 — Decklid Punch-Out Sensor Circuit Failure. 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, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B1496 — OBD2 code B1496 flags a problem with the body electrical system (decklid punch-out sensor open circuit). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, body control module (BCM) fault, blown fuse or failed relay.
• B1497 — B1497 — Decklid Punch-Out Sensor Battery Short. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
• B1498 — B1498 — Decklid Punch-Out Sensor Ground Short. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: blown fuse or failed relay, body control module (BCM) fault, damaged wiring in door jambs or wet areas.
• B1499 — Lamp Turn Signal Left Circuit Failure (B1499): 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, blown fuse or failed relay, corroded or loose connectors.
• B1500 — Lamp Turn Signal Left Circuit Open (B1500): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by body control module (BCM) fault, blown fuse or failed relay, corroded or loose connectors.
• B1501 — OBD2 code B1501 flags a problem with the body electrical system (lamp turn signal left circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B1502 — B1502 — Lamp Turn Signal Left Circuit Short To Ground. 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.
• B1503 — B1503 — Lamp Turn Signal Right Circuit Failure. 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, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.
• B1504 — Lamp Turn Signal Right Circuit Open (B1504): 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, body control module (BCM) fault, corroded or loose connectors.
• B1505 — Lamp Turn Signal Right Circuit Short To Battery (B1505): 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.
• B1506 — Lamp Turn Signal Right Circuit Short To Ground (B1506): 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, blown fuse or failed relay, body control module (BCM) fault.
• B1507 — Flash To Pass Switch Circuit Failure (B1507): 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, corroded or loose connectors, faulty switch, motor or actuator of the affected system.
• B1508 — Flash To Pass Switch Circuit Open (B1508): 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, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.
• B1509 — OBD2 code B1509 flags a problem with the body electrical system (flash to pass switch circuit short to battery). 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, corroded or loose connectors.
• B1510 — OBD2 code B1510 flags a problem with the body electrical system (flash to pass switch circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B1511 — B1511 — Driver Door Handle Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: blown fuse or failed relay, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.