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

• C1401 — C1401 — Traction Control Valve RF Circuit Open. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: faulty ABS module or pump motor, failed wheel speed sensor, damaged sensor wiring or corroded connector.
• C1402 — OBD2 code C1402 flags a problem with the ABS / stability control (traction control valve RF circuit short to ground). Short, gentle driving to a shop is usually possible. Common culprits: blown fuse or low voltage to the ABS module, failed wheel speed sensor, damaged tone (reluctor) ring on the hub.
• C1403 — C1403 — Traction Control Valve RF Circuit Short To Battery. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub, failed wheel speed sensor.
• C1404 — C1404 — Traction Control Valve Rear Circuit Failure. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub, failed wheel speed sensor.
• C1405 — Traction Control Valve Rear Circuit Open (C1405): a chassis (brakes/steering/suspension) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector, damaged tone (reluctor) ring on the hub.
• C1406 — C1406 — Traction Control Valve Rear Circuit Short To Ground. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: faulty ABS module or pump motor, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.
• C1407 — C1407 — Traction Control Valve Rear Circuit Short To Battery. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: faulty ABS module or pump motor, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.
• C1408 — C1408 — Park Brake Release Switch Circuit Out Of Range: Causes, Symptoms & Fix (C1408): a vehicle fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by failed wheel speed sensor, damaged sensor wiring or corroded connector, blown fuse or low voltage to the ABS module.
• C1409 — C1409 — Park Brake Apply Switch Circuit Out Of Range: Causes, Symptoms & Fix (C1409): a vehicle fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by failed wheel speed sensor, blown fuse or low voltage to the ABS module, damaged tone (reluctor) ring on the hub.
• C1410 — Traction Control Valve LF Circuit Failure (C1410): a chassis (brakes/steering/suspension) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by damaged sensor wiring or corroded connector, faulty ABS module or pump motor, failed wheel speed sensor.
• C1411 — Traction Control Valve LF Circuit Open (C1411): a chassis (brakes/steering/suspension) fault affecting the ABS / stability control. Short, gentle driving to a shop is usually possible. Most often caused by blown fuse or low voltage to the ABS module, damaged tone (reluctor) ring on the hub, failed wheel speed sensor.
• C1412 — C1412 — Traction Control Valve LF Circuit Short To Ground. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: damaged tone (reluctor) ring on the hub, failed wheel speed sensor, damaged sensor wiring or corroded connector.
• C1413 — C1413 — Traction Control Valve LF Circuit Short To Battery. 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, damaged tone (reluctor) ring on the hub.
• C1414 — C1414 — Incorrect Module Design Level. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
• C1415 — C1415 — Incorrect Module Configuration. 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, control module driver fault, open or shorted wiring in the circuit.
• C1416 — Damper RF Circuit Short To Battery (C1416): 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 blown fuse feeding the circuit, open or shorted wiring in the circuit, control module driver fault.
• C1417 — Damper RF Circuit Short to Ground (C1417): 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 faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit, blown fuse feeding the circuit.
• C1418 — OBD2 code C1418 flags a problem with the sensor and actuator circuits (damper RF circuit failure). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
• C1419 — Damper RF Circuit Open (C1419): 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 control module driver fault, faulty sensor or actuator of the affected circuit, poor ground connection.
• C1420 — OBD2 code C1420 flags a problem with the sensor and actuator circuits (hydraulic fluid pressure/ flow circuit short to vbatt). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, faulty sensor or actuator of the affected circuit.
• C1421 — Damper LF Circuit Short To Battery (C1421): 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 faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit, corroded, loose or damaged connector.
• C1422 — C1422 — Damper LF Circuit Short to Ground. 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, corroded, loose or damaged connector, open or shorted wiring in the circuit.
• C1423 — C1423 — Damper LF Circuit 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, open or shorted wiring in the circuit, poor ground connection.
• C1424 — Damper LF Circuit Open (C1424): 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 control module driver fault, open or shorted wiring in the circuit, blown fuse feeding the circuit.