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

• C0064 — OBD2 code C0064 flags a problem with the sensor and actuator circuits (C0064 — roll rate sensor (subfault): causes, symptoms & fix). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, open or shorted wiring in the circuit.
• C0069 — OBD2 code C0069 flags a problem with the ABS / stability control (C0069 — yaw rate/longitude sensors (subfault): causes, symptoms & fix). Short, gentle driving to a shop is usually possible. Common culprits: faulty ABS module or pump motor, damaged sensor wiring or corroded connector, blown fuse or low voltage to the ABS module.
• C006A — C006A — C006A — Multi-axis 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: poor ground connection, corroded, loose or damaged connector, open or shorted wiring in the circuit.
• C006B — C006B — Stability System Active Too Long (Subfault): Causes, Symptoms & Fix (C006B): a vehicle 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.
• C006C — C006C — Stability System (Subfault): Causes, Symptoms & Fix (C006C): 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, faulty ABS module or pump motor, failed wheel speed sensor.
• C0071 — C0071 — 2/4 Wheel Drive Status Input (Subfault): Causes, Symptoms & Fix (C0071): a vehicle 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, corroded, loose or damaged connector, control module driver fault.
• C0072 — C0072 — C0072 — Brake Temperature Too High (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 sensor wiring or corroded connector, failed wheel speed sensor.
• C0073 — OBD2 code C0073 flags a problem with the sensor and actuator circuits (C0073 — delivered driving torque (subfault): causes, symptoms & fix). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• C0074 — C0074 — C0074 — Requested Driving Torque (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, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
• C0075 — OBD2 code C0075 flags a problem with the ABS / stability control (C0075 — extended brake pedal travel output to PCM (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 tone (reluctor) ring on the hub, failed wheel speed sensor.
• C0076 — C0076 — PWM for Traction Control (Subfault): Causes, Symptoms & Fix (C0076): 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, faulty ABS module or pump motor, damaged sensor wiring or corroded connector.
• C0077 — C0077 — C0077 — Low Tire Pressure (Subfault): 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, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
• C0078 — C0078 — C0078 — Tire Diameter (Subfault): Causes, Symptoms & Fix. 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, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• C0079 — OBD2 code C0079 flags a problem with the sensor and actuator circuits (C0079 — variable effort steering (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.
• C0081 — OBD2 code C0081 flags a problem with the ABS / stability control (C0081 — ABS malfunction indicator (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.
• C0082 — C0082 — Brake System Malfunction Indicator (Subfault): Causes, Symptoms & Fix (C0082): a vehicle 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, damaged tone (reluctor) ring on the hub, blown fuse or low voltage to the ABS module.
• C0083 — C0083 — C0083 — Tire Pressure Monitor Malfunction Indicator (Subfault): 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, blown fuse feeding the circuit, control module driver fault.
• C0084 — C0084 — Traction Active Indicator (Subfault): Causes, Symptoms & Fix (C0084): 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, failed wheel speed sensor, damaged tone (reluctor) ring on the hub.
• C0085 — OBD2 code C0085 flags a problem with the ABS / stability control (C0085 — traction disable indicator (subfault): causes, symptoms & fix). 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, faulty ABS module or pump motor.
• C0086 — C0086 — C0086 — Vehicle Dynamics Indicator (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.
• C0089 — C0089 — C0089 — TCS Disable Switch (Subfault): 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, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
• C008A — C008A — C008A — TCS Mode Control (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, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
• C0663 — C0663 — C0663 — Left Rear Wheel Speed Sensor B Intermittent/Erratic: 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 tone (reluctor) ring on the hub, failed wheel speed sensor.
• C0664 — C0664 — Left Rear Wheel Speed Sensor B Correlation: Causes, Symptoms & Fix (C0664): a vehicle 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, damaged tone (reluctor) ring on the hub.