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.

C1273 — C1273 — Motor # 2 Input Circuit Short to Vbat. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: corroded, loose or damaged connector, blown fuse feeding the circuit, poor ground connection.
C1274 — C1274 — Solenoid Relay # 1 Circuit Failure. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, poor ground connection, faulty sensor or actuator of the affected circuit.
C1275 — OBD2 code C1275 flags a problem with the sensor and actuator circuits (solenoid relay # 1 circuit short to vbatt). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
C1276 — OBD2 code C1276 flags a problem with the ABS / stability control (park brake actuator assembly switch applied circuit short to gnd). Short, gentle driving to a shop is usually possible. Common culprits: failed wheel speed sensor, damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module.
C1277 — OBD2 code C1277 flags a problem with the sensor and actuator circuits (STEERING wheel angle 1and 2 circuit failure). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, control module driver fault.
C1278 — C1278 — STEERING Wheel Angle 1and 2 Signal Faulted. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, corroded, loose or damaged connector, blown fuse feeding the circuit.
C1279 — C1279 — Yaw Rate Sensor circuit Failure. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector, faulty ABS module or pump motor.
C1280 — C1280 — Yaw Rate Sensor Signal Fault. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: damaged sensor wiring or corroded connector, blown fuse or low voltage to the ABS module, faulty ABS module or pump motor.
C1281 — C1281 — Lateral Accelerometer circuit Failure. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: blown fuse feeding the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
C1282 — OBD2 code C1282 flags a problem with the sensor and actuator circuits (lateral accelerometer signal fault). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, open or shorted wiring in the circuit, poor ground connection.
C1283 — OBD2 code C1283 flags a problem with the sensor and actuator circuits (switch test signal failure). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
C1284 — C1284 — Oil Pressure Switch Failure. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: faulty sensor or actuator of the affected circuit, poor ground connection, corroded, loose or damaged connector.
C1285 — Booster Solenoid circuit Failure (C1285): a chassis (brakes/steering/suspension) fault affecting the turbocharger / supercharger boost control. Short, gentle driving to a shop is usually possible. Most often caused by faulty boost pressure sensor, vacuum or actuator line damage, boost leak in intercooler piping or hoses.
C1286 — OBD2 code C1286 flags a problem with the turbocharger / supercharger boost control (booster mechanical failure). Short, gentle driving to a shop is usually possible. Common culprits: boost leak in intercooler piping or hoses, clogged intake or exhaust (DPF/cat), worn turbocharger.
C1287 — OBD2 code C1287 flags a problem with the turbocharger / supercharger boost control (booster pedal force switch circuit failure). Short, gentle driving to a shop is usually possible. Common culprits: boost leak in intercooler piping or hoses, stuck wastegate or faulty boost control solenoid, faulty boost pressure sensor.
C1288 — Pressure Transducer Main / Primary Input Circuit Failure (C1288): a chassis (brakes/steering/suspension) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by poor ground connection, corroded, loose or damaged connector, blown fuse feeding the circuit.
C1289 — OBD2 code C1289 flags a problem with the sensor and actuator circuits (pressure transducer redundant / secondary input circuit failure). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, control module driver fault, corroded, loose or damaged connector.
C1291 — C1291 — Adaptive Speed Control Module Sensor Temperature Out Of Range: Causes, Symptoms & Fix (C1291): a vehicle fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, poor ground connection.
C1292 — C1292 — C1292 — Adaptive Speed Control Blockage Detection: Causes, Symptoms & Fix. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: blown fuse feeding the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
C1293 — C1293 — Adaptive Speed Control Alignment Offset Angle Out Of Range: Causes, Symptoms & Fix (C1293): a vehicle fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by poor ground connection, faulty sensor or actuator of the affected circuit, control module driver fault.
C1294 — C1294 — C1294 — Adaptive Speed Control Active Speed Out Of Range: Causes, Symptoms & Fix. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, poor ground connection, corroded, loose or damaged connector.
C1295 — C1295 — C1295 — Steering Wheel Angle Sensor Internal Fault: Causes, Symptoms & Fix. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, open or shorted wiring in the circuit, blown fuse feeding the circuit.
C1296 — C1296 — Front Left Wheel Speed Signal Fault: Causes, Symptoms & Fix (C1296): a vehicle fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module, faulty ABS module or pump motor.
C1297 — C1297 — Front Right Wheel Speed Signal Fault: Causes, Symptoms & Fix (C1297): a vehicle fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by faulty ABS module or pump motor, damaged sensor wiring or corroded connector, damaged tone (reluctor) ring on the hub.