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

• B1512 — B1512 — Driver Door Handle Circuit Open. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, body control module (BCM) fault, blown fuse or failed relay.
• B1513 — B1513 — Driver Door Handle Circuit Short To Battery. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: blown fuse or failed relay, corroded or loose connectors, body control module (BCM) fault.
• B1514 — B1514 — Driver Door Handle Circuit Short To Ground. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: faulty switch, motor or actuator of the affected system, body control module (BCM) fault, damaged wiring in door jambs or wet areas.
• B1515 — OBD2 code B1515 flags a problem with the body electrical system (seat driver occupied switch circuit failure). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
• B1516 — Seat Driver Occupied Switch Circuit Open (B1516): 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, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1517 — B1517 — Seat Driver Occupied Switch Circuit Short To Battery. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.
• B1518 — Seat Driver Occupied Switch Circuit Short To Ground (B1518): 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, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B1519 — OBD2 code B1519 flags a problem with the body electrical system (hood switch circuit failure). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, corroded or loose connectors, blown fuse or failed relay.
• B1520 — OBD2 code B1520 flags a problem with the body electrical system (hood switch circuit open). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, blown fuse or failed relay, corroded or loose connectors.
• B1521 — Hood Switch Circuit Short To Battery (B1521): 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, body control module (BCM) fault, damaged wiring in door jambs or wet areas.
• B1522 — B1522 — Hood Switch 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, damaged wiring in door jambs or wet areas.
• B1523 — B1523 — Keyless Entry 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, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B1524 — OBD2 code B1524 flags a problem with the body electrical system (keyless entry circuit open). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B1525 — OBD2 code B1525 flags a problem with the body electrical system (keyless entry 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, faulty switch, motor or actuator of the affected system.
• B1526 — OBD2 code B1526 flags a problem with the body electrical system (keyless entry circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
• B1527 — Memory Set Switch Circuit Failure (B1527): 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, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B1528 — Memory Set Switch Circuit Open (B1528): 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, faulty switch, motor or actuator of the affected system.
• B1529 — Memory Set Switch Circuit Short To Battery (B1529): 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.
• B1530 — OBD2 code B1530 flags a problem with the body electrical system (memory set switch circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B1531 — Memory 1 Switch Circuit Failure (B1531): 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, faulty switch, motor or actuator of the affected system, corroded or loose connectors.
• B1532 — Memory 1 Switch Circuit Open (B1532): 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, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B1533 — Memory 1 Switch Circuit Short To Battery (B1533): 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, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1534 — B1534 — Memory 1 Switch Circuit Short To Ground. 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, body control module (BCM) fault.
• B1535 — OBD2 code B1535 flags a problem with the body electrical system (memory 2 switch circuit failure). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, blown fuse or failed relay, damaged wiring in door jambs or wet areas.