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

• C1949 — C1949 — Accelerometer Sensor Circuit Open. 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.
• C1950 — Accelerometer Sensor Circuit Failure (C1950): 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, poor ground connection.
• C1951 — OBD2 code C1951 flags a problem with the sensor and actuator circuits (lateral accelerometer sensor circuit open). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, control module driver fault, blown fuse feeding the circuit.
• C1952 — Yaw Rate Sensor Circuit Open (C1952): a chassis (brakes/steering/suspension) 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, blown fuse or low voltage to the ABS module, failed wheel speed sensor.
• C1953 — C1953 — Master Cylinder Pressure Sensor Circuit Open. 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, blown fuse feeding the circuit.
• C1954 — OBD2 code C1954 flags a problem with the sensor and actuator circuits (master cylinder pressure sensor circuit failure). 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, control module driver fault.
• C1955 — OBD2 code C1955 flags a problem with the ABS / stability control (steering angle sensor circuit open). Short, gentle driving to a shop is usually possible. Common culprits: damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module, damaged sensor wiring or corroded connector.
• C1956 — OBD2 code C1956 flags a problem with the ABS / stability control (steering angle sensor circuit failure). Short, gentle driving to a shop is usually possible. Common culprits: damaged tone (reluctor) ring on the hub, damaged sensor wiring or corroded connector, failed wheel speed sensor.
• C1957 — C1957 — Dynamic Stability Control Valve RF Circuit Failure. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: failed wheel speed sensor, damaged sensor wiring or corroded connector, damaged tone (reluctor) ring on the hub.
• C1958 — C1958 — Dynamic Stability Control Valve LF Circuit Failure. A fault in the ABS / stability control. Short, gentle driving to a shop is usually possible. Typical causes: damaged sensor wiring or corroded connector, failed wheel speed sensor, damaged tone (reluctor) ring on the hub.
• C1959 — Lateral Accelerometer Sensor Circuit Failure (C1959): 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, poor ground connection, corroded, loose or damaged connector.
• C1960 — Driver Brake Apply Circuit Fault (C1960): a chassis (brakes/steering/suspension) 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, damaged tone (reluctor) ring on the hub.
• C1961 — C1961 — Park Lamp Relay Coil Circuit Failure. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, failed ignition coil or coil pack, damaged coil wiring or connector.
• C1962 — Park Lamp Relay Coil Short to Battery (C1962): a chassis (brakes/steering/suspension) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by worn spark plugs or wrong plug gap, faulty ignition control circuit in the ECM, failed ignition coil or coil pack.
• C1963 — OBD2 code C1963 flags a problem with the ABS / stability control (stability control inhibit warning). 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.
• C2767 — Reserved - TBD (C2767): 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, faulty sensor or actuator of the affected circuit, control module driver fault.
• P0001 — Fuel Volume Regulator Control Circuit/Open (P0001): a powertrain (engine/transmission) 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, corroded, loose or damaged connector, control module driver fault.
• P0002 — OBD2 code P0002 flags a problem with the sensor and actuator circuits (fuel volume regulator control circuit range/performance). 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.
• P0003 — Fuel Volume Regulator Control Circuit Low (P0003): a powertrain (engine/transmission) 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, blown fuse feeding the circuit, control module driver fault.
• P0004 — OBD2 code P0004 flags a problem with the sensor and actuator circuits (fuel volume regulator control circuit high). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P0005 — OBD2 code P0005 flags a problem with the sensor and actuator circuits (fuel shutoff valve "A" control circuit/open). 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, open or shorted wiring in the circuit.
• P0006 — OBD2 code P0006 flags a problem with the sensor and actuator circuits (fuel shutoff valve "A" control circuit low). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• P0007 — OBD2 code P0007 flags a problem with the sensor and actuator circuits (fuel shutoff valve "A" control circuit high). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P0008 — P0008 — Engine Positions System Performance Bank 1. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, blown fuse feeding the circuit, poor ground connection.