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

• B1656 — Seat Driver Rear Up Circuit Open (B1656): 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.
• B1657 — OBD2 code B1657 flags a problem with the body electrical system (seat driver rear up circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, corroded or loose connectors, faulty switch, motor or actuator of the affected system.
• B1658 — OBD2 code B1658 flags a problem with the body electrical system (seat driver rear up circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, faulty switch, motor or actuator of the affected system, corroded or loose connectors.
• B1659 — B1659 — Seat Driver Front Up 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.
• B1660 — OBD2 code B1660 flags a problem with the body electrical system (seat driver front up circuit open). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, body control module (BCM) fault, corroded or loose connectors.
• B1661 — B1661 — Seat Driver Front Up Circuit Short To Battery. 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.
• B1662 — Seat Driver Front Up Circuit Short To Ground (B1662): 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, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
• B1663 — Seat Driver Front Up/Down Motor Stalled (B1663): 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, damaged wiring in door jambs or wet areas, blown fuse or failed relay.
• B1664 — B1664 — Seat Driver Rear Up/Down Motor Stalled. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B1665 — OBD2 code B1665 flags a problem with the body electrical system (seat driver forward/backward motor stalled). 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, blown fuse or failed relay.
• B1666 — OBD2 code B1666 flags a problem with the body electrical system (seat driver recline motor stalled). 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.
• B1667 — B1667 — Mirror Driver Up/Down Motor Stalled. 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, blown fuse or failed relay, corroded or loose connectors.
• B1668 — B1668 — Mirror Driver Right/Left Motor Stalled. 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, faulty switch, motor or actuator of the affected system.
• B1669 — Mirror Passenger Up/Down Motor Stalled (B1669): 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.
• B1670 — B1670 — Mirror Passenger Right/Left Motor Stalled. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1671 — OBD2 code B1671 flags a problem with the body electrical system (battery module voltage out of range). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, blown fuse or failed relay, body control module (BCM) fault.
• B1672 — B1672 — Seat Driver Occupied Input 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, corroded or loose connectors.
• B1673 — OBD2 code B1673 flags a problem with the body electrical system (seat driver occupied input circuit open). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
• B1674 — Seat Driver Occupied Input Circuit Short To Battery (B1674): 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.
• B1675 — OBD2 code B1675 flags a problem with the body electrical system (seat driver occupied input circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, body control module (BCM) fault, corroded or loose connectors.
• B1676 — B1676 — Battery Pack Voltage Out Of Range. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: body control module (BCM) fault, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
• B1677 — Alarm Panic Input Circuit Failure (B1677): 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, damaged wiring in door jambs or wet areas.
• B1678 — OBD2 code B1678 flags a problem with the body electrical system (alarm panic input circuit open). 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, faulty switch, motor or actuator of the affected system.
• B1679 — Alarm Panic Input Circuit Short To Battery (B1679): 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, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.