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

• B1824 — Wiper Rear Park Sense Input Circuit Short To Battery (B1824): 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, body control module (BCM) fault.
• B1825 — OBD2 code B1825 flags a problem with the body electrical system (wiper rear park sense input circuit short to ground). 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, corroded or loose connectors.
• B1826 — OBD2 code B1826 flags a problem with the body electrical system (wiper rear high limit input circuit failure). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, damaged wiring in door jambs or wet areas, body control module (BCM) fault.
• B1827 — OBD2 code B1827 flags a problem with the body electrical system (wiper rear high limit 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, corroded or loose connectors.
• B1828 — Wiper Rear High Limit Input Circuit Short To Battery (B1828): 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.
• B1829 — OBD2 code B1829 flags a problem with the body electrical system (wiper rear high limit input 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, faulty switch, motor or actuator of the affected system.
• B1830 — OBD2 code B1830 flags a problem with the body electrical system (door unlock disarm switch circuit failure). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.
• B1831 — B1831 — Door Unlock Disarm Switch 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, damaged wiring in door jambs or wet areas, body control module (BCM) fault.
• B1832 — Door Unlock Disarm Switch Circuit Short To Battery (B1832): 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, body control module (BCM) fault.
• B1833 — OBD2 code B1833 flags a problem with the body electrical system (door unlock disarm 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, body control module (BCM) fault.
• B1834 — Door Unlock Disarm Output Circuit Failure (B1834): 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, blown fuse or failed relay.
• B1835 — OBD2 code B1835 flags a problem with the body electrical system (door unlock disarm output circuit open). 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.
• B1836 — OBD2 code B1836 flags a problem with the body electrical system (door unlock disarm output circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, body control module (BCM) fault, blown fuse or failed relay.
• B1837 — OBD2 code B1837 flags a problem with the body electrical system (door unlock disarm output 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.
• B1838 — OBD2 code B1838 flags a problem with the body electrical system (battery saver power relay circuit failure). 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.
• B1839 — Wiper Rear Motor Circuit Failure (B1839): 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.
• B1840 — B1840 — Wiper Front Power 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, blown fuse or failed relay, body control module (BCM) fault.
• B1841 — B1841 — Wiper Front Power 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, corroded or loose connectors, blown fuse or failed relay.
• B1842 — B1842 — Wiper Front Power 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, blown fuse or failed relay, body control module (BCM) fault.
• B1843 — B1843 — Wiper Front Power 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.
• B1844 — Phone Handset Circuit Failure (B1844): 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, body control module (BCM) fault.
• B1845 — B1845 — Ignition Tamper 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, damaged coil wiring or connector, worn spark plugs or wrong plug gap.
• B1846 — B1846 — Ignition Tamper Circuit Open. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, damaged coil wiring or connector, faulty ignition control circuit in the ECM.
• B1847 — OBD2 code B1847 flags a problem with the ignition system (ignition tamper circuit short to battery). Short, gentle driving to a shop is usually possible. Common culprits: faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells, worn spark plugs or wrong plug gap.