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

• C003A — C003A — C003A — Right Rear Wheel Speed Sensor (Subfault): Causes, Symptoms & Fix. 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, failed wheel speed sensor.
• C003B — C003B — C003B — Right Rear Wheel Speed Sensor Supply (Subfault): Causes, Symptoms & Fix. 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, faulty ABS module or pump motor.
• C003C — C003C — C003C — Rear Tone Wheel (Subfault): Causes, Symptoms & Fix. 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.
• C003D — OBD2 code C003D flags a problem with the ABS / stability control (C003D — rear wheel speed sensor (subfault): causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: failed wheel speed sensor, damaged sensor wiring or corroded connector, damaged tone (reluctor) ring on the hub.
• C003E — C003E — C003E — Rear Wheel Speed Sensor Supply (Subfault): Causes, Symptoms & Fix. 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, damaged sensor wiring or corroded connector.
• C0040 — C0040 — Brake Pedal Switch A (Subfault): Causes, Symptoms & Fix (C0040): 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 tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector.
• C0041 — C0041 — Brake Pedal Switch B (Subfault): Causes, Symptoms & Fix (C0041): 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 sensor wiring or corroded connector.
• C0042 — C0042 — Brake Pedal Position Sensor Circuit A (Subfault): Causes, Symptoms & Fix (C0042): 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, failed wheel speed sensor, damaged sensor wiring or corroded connector.
• C0043 — OBD2 code C0043 flags a problem with the ABS / stability control (C0043 — brake pedal position sensor circuit b (subfault): causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: failed wheel speed sensor, faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub.
• C0044 — OBD2 code C0044 flags a problem with the ABS / stability control (C0044 — brake pressure sensor a (subfault): causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: failed wheel speed sensor, damaged tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector.
• C0045 — C0045 — C0045 — Brake Pressure Sensor B (Subfault): Causes, Symptoms & Fix. 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, faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub.
• C0046 — OBD2 code C0046 flags a problem with the ABS / stability control (C0046 — brake pressure sensor A/B (subfault): causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: blown fuse or low voltage to the ABS module, faulty ABS module or pump motor, damaged tone (reluctor) ring on the hub.
• C0047 — OBD2 code C0047 flags a problem with the turbocharger / supercharger boost control (C0047 — brake booster pressure sensor (subfault): causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: stuck wastegate or faulty boost control solenoid, clogged intake or exhaust (DPF/cat), faulty boost pressure sensor.
• C0048 — C0048 — Brake Booster Travel Sensor (Subfault): Causes, Symptoms & Fix (C0048): a vehicle fault affecting the turbocharger / supercharger boost control. Short, gentle driving to a shop is usually possible. Most often caused by clogged intake or exhaust (DPF/cat), faulty boost pressure sensor, boost leak in intercooler piping or hoses.
• C0049 — C0049 — Brake Fluid (Subfault): Causes, Symptoms & Fix (C0049): 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 tone (reluctor) ring on the hub, faulty ABS module or pump motor.
• C004A — C004A — Brake Lining Wear Sensor (Subfault): Causes, Symptoms & Fix (C004A): a vehicle 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, damaged sensor wiring or corroded connector.
• C0051 — C0051 — C0051 — Steering Wheel Position Sensor (Subfault): 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, blown fuse feeding the circuit.
• C0052 — OBD2 code C0052 flags a problem with the sensor and actuator circuits (C0052 — steering wheel position sensor signal a (subfault): causes, symptoms & fix). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, blown fuse feeding the circuit.
• C0053 — C0053 — C0053 — Steering Wheel Position Sensor Signal B (Subfault): Causes, Symptoms & Fix. 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, poor ground connection, blown fuse feeding the circuit.
• C0054 — OBD2 code C0054 flags a problem with the sensor and actuator circuits (C0054 — steering wheel position sensor signal c (subfault): causes, symptoms & fix). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, blown fuse feeding the circuit, corroded, loose or damaged connector.
• C0055 — C0055 — Steering Wheel Position Sensor Signal D (Subfault): Causes, Symptoms & Fix (C0055): 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, corroded, loose or damaged connector.
• C0061 — C0061 — C0061 — Lateral Acceleration Sensor (Subfault): 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, control module driver fault, poor ground connection.
• C0062 — OBD2 code C0062 flags a problem with the sensor and actuator circuits (C0062 — longitudinal acceleration sensor (subfault): causes, symptoms & fix). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
• C0063 — OBD2 code C0063 flags a problem with the ABS / stability control (C0063 — yaw rate sensor (subfault): causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector, failed wheel speed sensor.