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

• B1992 — B1992 — Driver Side. 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, corroded or loose connectors, blown fuse or failed relay.
• B1993 — OBD2 code B1993 flags a problem with the body electrical system (driver side). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, blown fuse or failed relay, body control module (BCM) fault.
• B1994 — B1994 — Driver Side. 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, corroded or loose connectors.
• B1995 — OBD2 code B1995 flags a problem with the body electrical system (driver side). 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.
• B1996 — OBD2 code B1996 flags a problem with the body electrical system (passenger side). 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, body control module (BCM) fault.
• B1997 — B1997 — Passenger Side. 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.
• B1998 — B1998 — Passenger Side. 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, corroded or loose connectors.
• B1999 — OBD2 code B1999 flags a problem with the body electrical system (passenger side). 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.
• B2100 — B2100 — Door Driver Key Cylinder Switch 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, body control module (BCM) fault, damaged wiring in door jambs or wet areas.
• B2101 — Head Rest Switch Circuit Failure (B2101): 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.
• B2102 — B2102 — Antenna 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, faulty switch, motor or actuator of the affected system.
• B2103 — OBD2 code B2103 flags a problem with the body electrical system (antenna not connected). 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.
• B2104 — B2104 — Door Passenger Key Cylinder Switch Failure. 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, faulty switch, motor or actuator of the affected system.
• B2105 — OBD2 code B2105 flags a problem with the throttle and intake air metering (throttle position input out of range low). Short, gentle driving to a shop is usually possible. Common culprits: intake air leaks after the MAF sensor, faulty throttle position sensor or pedal sensor, dirty throttle body or stuck throttle plate.
• B2106 — OBD2 code B2106 flags a problem with the throttle and intake air metering (throttle position input out of range high). Short, gentle driving to a shop is usually possible. Common culprits: intake air leaks after the MAF sensor, failed electronic throttle motor, contaminated or failed MAF/MAP sensor.
• B2107 — OBD2 code B2107 flags a problem with the body electrical system (front wiper motor relay circuit short to vbatt). 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.
• B2108 — B2108 — Trunk Key Cylinder Switch 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, body control module (BCM) fault.
• B2109 — OBD2 code B2109 flags a problem with the body electrical system (heated wind shield relay short to vbatt (changed from failure 2/6/97)). 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.
• B2110 — Front Wiper Motor Relay Circuit Open (changed from Failure 2/6/97) (B2110): 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.
• B2111 — All Door Lock Input Short to Ground (B2111): 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, corroded or loose connectors.
• B2112 — OBD2 code B2112 flags a problem with the body electrical system (door driver set switch stuck 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, faulty switch, motor or actuator of the affected system.
• B2113 — OBD2 code B2113 flags a problem with the body electrical system (heated windshield input short to ground). 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, body control module (BCM) fault.
• B2114 — B2114 — Front Washer Input 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, blown fuse or failed relay.
• B2115 — B2115 — Rear Washer Input 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, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.