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

• B1728 — B1728 — Seat Driver Rear Up Switch 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, blown fuse or failed relay, body control module (BCM) fault.
• B1729 — Seat Driver Rear Down Switch Circuit Failure (B1729): 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, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B1730 — B1730 — Seat Driver Rear Down Switch Circuit Open. 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, damaged wiring in door jambs or wet areas, corroded or loose connectors.
• B1731 — OBD2 code B1731 flags a problem with the body electrical system (seat driver rear down switch circuit short to battery). 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.
• B1732 — Seat Driver Rear Down Switch Circuit Short To Ground (B1732): 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, body control module (BCM) fault.
• B1733 — B1733 — Mirror Driver Vertical Switch 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, corroded or loose connectors.
• B1734 — Mirror Driver Vertical Switch Circuit Open (B1734): 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, blown fuse or failed relay.
• B1735 — OBD2 code B1735 flags a problem with the body electrical system (mirror driver vertical switch circuit short to battery). 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, faulty switch, motor or actuator of the affected system.
• B1736 — B1736 — Mirror Driver Vertical Switch 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, body control module (BCM) fault, corroded or loose connectors.
• B1737 — OBD2 code B1737 flags a problem with the body electrical system (mirror driver horizontal switch circuit failure). 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.
• B1738 — OBD2 code B1738 flags a problem with the body electrical system (mirror driver horizontal switch circuit open). 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.
• B1739 — OBD2 code B1739 flags a problem with the body electrical system (mirror driver horizontal switch circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: blown fuse or failed relay, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1740 — OBD2 code B1740 flags a problem with the body electrical system (mirror driver horizontal switch circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.
• B1741 — Mirror Passenger Vertical Switch Circuit Failure (B1741): 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, body control module (BCM) fault.
• B1742 — B1742 — Mirror Passenger Vertical Switch Circuit Open. 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.
• B1743 — OBD2 code B1743 flags a problem with the body electrical system (mirror passenger vertical switch circuit short to battery). 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, damaged wiring in door jambs or wet areas.
• B1744 — Mirror Passenger Vertical Switch Circuit Short To Ground (B1744): 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.
• B1745 — Mirror Passenger Horizontal Switch Circuit Failure (B1745): 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, corroded or loose connectors.
• B1746 — OBD2 code B1746 flags a problem with the body electrical system (mirror passenger horizontal switch circuit open). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, body control module (BCM) fault, damaged wiring in door jambs or wet areas.
• B1747 — Mirror Passenger Horizontal Switch Circuit Short To Battery (B1747): 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, blown fuse or failed relay.
• B1748 — B1748 — Mirror Passenger Horizontal 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, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1749 — OBD2 code B1749 flags a problem with the body electrical system (park/neutral switch circuit failure). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, corroded or loose connectors, damaged wiring in door jambs or wet areas.
• B1750 — OBD2 code B1750 flags a problem with the body electrical system (park/neutral switch circuit open). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, blown fuse or failed relay, corroded or loose connectors.
• B1751 — Park/Neutral Switch Circuit Short To Battery (B1751): 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, faulty switch, motor or actuator of the affected system.