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

• B2231 — B2231 — Air Bag Passenger Circuit Short to Battery - Loop #2. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: damaged wiring under seats or in the steering column, faulty impact or occupancy sensor, depleted backup battery or low system voltage.
• B2232 — OBD2 code B2232 flags a problem with the airbag / restraint system (SRS) (air bag driver circuit open - loop #2). Short, gentle driving to a shop is usually possible. Common culprits: damaged wiring under seats or in the steering column, depleted backup battery or low system voltage, failed clockspring (driver airbag circuit).
• B2233 — OBD2 code B2233 flags a problem with the airbag / restraint system (SRS) (air bag passenger circuit open - loop #2). Short, gentle driving to a shop is usually possible. Common culprits: faulty impact or occupancy sensor, SRS control module fault or stored crash data, depleted backup battery or low system voltage.
• B2234 — B2234 — Air Bag Driver Inflator Circuit Resistance Low on Squib - Loop #2. A fault in the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Typical causes: failed clockspring (driver airbag circuit), SRS control module fault or stored crash data, faulty impact or occupancy sensor.
• B2235 — Air Bag Passenger Inflator Circuit (B2235): a body electrical fault affecting the airbag / restraint system (SRS). Short, gentle driving to a shop is usually possible. Most often caused by faulty impact or occupancy sensor, damaged wiring under seats or in the steering column, depleted backup battery or low system voltage.
• B2236 — B2236 — Weak or Defected Electric Vehicle Battery Module Fault. 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.
• B2238 — B2238 — Power Cable For Power Sliding Door Broken. 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, body control module (BCM) fault.
• B2239 — OBD2 code B2239 flags a problem with the body electrical system (rear cargo door set switch stuck (short to ground)). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, corroded or loose connectors, body control module (BCM) fault.
• B2240 — B2240 — Rear Cargo Door Reset Switch Stuck (Short to Ground). 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, damaged wiring in door jambs or wet areas.
• B2241 — OBD2 code B2241 flags a problem with the body electrical system (rear cargo door lock circuit short to ground). 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, blown fuse or failed relay.
• B2242 — Rear Cargo Door Unlock Circuit Open (B2242): 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, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.
• B2243 — Driver Rear Door Ajar Circuit Open (B2243): 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, faulty switch, motor or actuator of the affected system.
• B2244 — B2244 — Driver Sliding Door Ajar Circuit Short to GND. 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.
• B2245 — OBD2 code B2245 flags a problem with the body electrical system (passenger rear door ajar circuit open). 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.
• B2246 — OBD2 code B2246 flags a problem with the body electrical system (passenger sliding door ajar circuit short to GND). 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.
• B2247 — EV Battery Pack Temperature Fault (B2247): 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, faulty switch, motor or actuator of the affected system.
• B2248 — B2248 — Heated Windshield Relay Coil Circuit Failure. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: failed ignition coil or coil pack, worn spark plugs or wrong plug gap, damaged coil wiring or connector.
• B2249 — B2249 — Head Lamp Relay Coil Short to Battery. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: moisture or oil in the spark plug wells, faulty ignition control circuit in the ECM, worn spark plugs or wrong plug gap.
• B2250 — All Doors Unlock Relay Circuit Failure (B2250): 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, corroded or loose connectors.
• B2251 — B2251 — Parklamp Output Relay Driver 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, corroded or loose connectors.
• B2252 — Parklamp Output Relay Dirver Short to Battery (B2252): 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, damaged wiring in door jambs or wet areas.
• B2300 — B2300 — Seat Driver Memory Position Error. 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.
• B2301 — OBD2 code B2301 flags a problem with the body electrical system (seat passenger memory position error). 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.
• B2302 — B2302 — Seat Headrest Feedback Potentiometer 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, faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas.