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

• B1272 — OBD2 code B1272 flags a problem with the body electrical system (servo motor potentiometer vent circuit failure). 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, body control module (BCM) fault.
• B1273 — Servo Motor Potentiometer Vent Circuit Open (B1273): 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.
• B1274 — Servo Motor Potentiometer Vent Circuit Short To Battery (B1274): 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.
• B1275 — Servo Motor Potentiometer Vent Circuit Short To Ground (B1275): 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.
• B1276 — OBD2 code B1276 flags a problem with the body electrical system (servo motor potentiometer foot circuit failure). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B1277 — Servo Motor Potentiometer Foot Circuit Open (B1277): 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, body control module (BCM) fault, corroded or loose connectors.
• B1278 — Servo Motor Potentiometer Foot Circuit Short To Battery (B1278): 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, corroded or loose connectors.
• B1279 — B1279 — Servo Motor Potentiometer Foot Circuit 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, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.
• B1280 — OBD2 code B1280 flags a problem with the body electrical system (servo motor potentiometer coolair 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.
• B1281 — Servo Motor Potentiometer Coolair Circuit Open (B1281): 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.
• B1282 — Servo Motor Potentiometer Coolair Circuit Short To Battery (B1282): 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.
• B1283 — OBD2 code B1283 flags a problem with the body electrical system (servo motor potentiometer coolair circuit short to ground). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, corroded or loose connectors, blown fuse or failed relay.
• B1284 — OBD2 code B1284 flags a problem with the body electrical system (servo motor potentiometer airintake left circuit failure). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, body control module (BCM) fault, faulty switch, motor or actuator of the affected system.
• B1285 — Servo Motor Potentiometer Airintake Left Circuit Open (B1285): 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, damaged wiring in door jambs or wet areas.
• B1286 — OBD2 code B1286 flags a problem with the body electrical system (servo motor potentiometer airintake left circuit short to battery). 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.
• B1287 — Servo Motor Potentiometer Airintake Left Circuit Short To Ground (B1287): 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.
• B1288 — Servo Motor Potentiometer Airintake Right Circuit Failure (B1288): 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, body control module (BCM) fault.
• B1289 — OBD2 code B1289 flags a problem with the body electrical system (servo motor potentiometer airintake right circuit open). 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.
• B1290 — OBD2 code B1290 flags a problem with the body electrical system (servo motor potentiometer airintake right circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: damaged wiring in door jambs or wet areas, blown fuse or failed relay, faulty switch, motor or actuator of the affected system.
• B1291 — Servo Motor Potentiometer Airintake Right Circuit Short To Ground (B1291): 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, damaged wiring in door jambs or wet areas.
• B1292 — Battery Power Relay Circuit Failure (B1292): 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.
• B1293 — Battery Power Relay Circuit Open (B1293): 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, damaged wiring in door jambs or wet areas.
• B1294 — OBD2 code B1294 flags a problem with the body electrical system (battery power relay circuit short to battery). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system.
• B1295 — Battery Power Relay Circuit Short To Ground (B1295): 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, blown fuse or failed relay.