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

• P06C1 — P06C1 — Cylinder 9 Glow Plug Circuit Range/Performance. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: burned-out glow plug, blown fuse in the glow plug circuit, faulty glow plug relay or control module.
• P06C2 — OBD2 code P06C2 flags a problem with the diesel glow plug system (cylinder 10 glow plug circuit range/performance). The car is usually drivable while you plan the repair. Common culprits: damaged glow plug wiring or connector, faulty glow plug relay or control module, corroded glow plug connectors.
• P06C3 — P06C3 — Cylinder 11 Glow Plug Circuit Range/Performance. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: corroded glow plug connectors, burned-out glow plug, blown fuse in the glow plug circuit.
• P06C4 — P06C4 — Cylinder 12 Glow Plug Circuit Range/Performance. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: damaged glow plug wiring or connector, blown fuse in the glow plug circuit, burned-out glow plug.
• P06C5 — Cylinder 1 Glow Plug Incorrect (P06C5): a powertrain (engine/transmission) fault affecting the diesel glow plug system. The car is usually drivable while you plan the repair. Most often caused by corroded glow plug connectors, faulty glow plug relay or control module, damaged glow plug wiring or connector.
• P06C6 — OBD2 code P06C6 flags a problem with the diesel glow plug system (cylinder 2 glow plug incorrect). The car is usually drivable while you plan the repair. Common culprits: corroded glow plug connectors, faulty glow plug relay or control module, blown fuse in the glow plug circuit.
• P06C7 — P06C7 — Cylinder 3 Glow Plug Incorrect. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: faulty glow plug relay or control module, corroded glow plug connectors, damaged glow plug wiring or connector.
• P06C8 — OBD2 code P06C8 flags a problem with the diesel glow plug system (cylinder 4 glow plug incorrect). The car is usually drivable while you plan the repair. Common culprits: blown fuse in the glow plug circuit, burned-out glow plug, faulty glow plug relay or control module.
• P06C9 — P06C9 — Cylinder 5 Glow Plug Incorrect. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: blown fuse in the glow plug circuit, corroded glow plug connectors, burned-out glow plug.
• P06CA — P06CA — Cylinder 6 Glow Plug Incorrect. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: damaged glow plug wiring or connector, burned-out glow plug, blown fuse in the glow plug circuit.
• P06CB — OBD2 code P06CB flags a problem with the diesel glow plug system (cylinder 7 glow plug incorrect). The car is usually drivable while you plan the repair. Common culprits: blown fuse in the glow plug circuit, corroded glow plug connectors, burned-out glow plug.
• P06CC — OBD2 code P06CC flags a problem with the diesel glow plug system (cylinder 8 glow plug incorrect). The car is usually drivable while you plan the repair. Common culprits: faulty glow plug relay or control module, blown fuse in the glow plug circuit, burned-out glow plug.
• P06CD — P06CD — Cylinder 9 Glow Plug Incorrect. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: damaged glow plug wiring or connector, faulty glow plug relay or control module, blown fuse in the glow plug circuit.
• P06CE — P06CE — Cylinder 10 Glow Plug Incorrect. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: damaged glow plug wiring or connector, blown fuse in the glow plug circuit, faulty glow plug relay or control module.
• P06CF — P06CF — Cylinder 11 Glow Plug Incorrect. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: faulty glow plug relay or control module, burned-out glow plug, damaged glow plug wiring or connector.
• P06D0 — P06D0 — Cylinder 12 Glow Plug Incorrect. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: faulty glow plug relay or control module, blown fuse in the glow plug circuit, corroded glow plug connectors.
• P06D1 — Internal Control Module Ignition Coil Control Performance (P06D1): a powertrain (engine/transmission) 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, damaged coil wiring or connector, faulty ignition control circuit in the ECM.
• P0700 — Transmission Control System Malfunction (P0700): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by failed shift or pressure control solenoid, low or degraded transmission fluid, internal mechanical wear (clutches, torque converter).
• P0701 — Transmission Control System Range/Performance (P0701): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by failed shift or pressure control solenoid, faulty transmission speed sensor, valve body wear.
• P0702 — OBD2 code P0702 flags a problem with the automatic transmission control (transmission control system electrical). Short, gentle driving to a shop is usually possible. Common culprits: internal mechanical wear (clutches, torque converter), low or degraded transmission fluid, failed shift or pressure control solenoid.
• P0703 — OBD2 code P0703 flags a problem with the automatic transmission control (torque converter/brake switch b circuit malfunction). Short, gentle driving to a shop is usually possible. Common culprits: failed shift or pressure control solenoid, wiring or connector faults in the valve body harness, low or degraded transmission fluid.
• P0704 — OBD2 code P0704 flags a problem with the sensor and actuator circuits (clutch switch input circuit malfunction). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, control module driver fault.
• P0705 — Transmission Range Sensor A Circuit malfunction (PRNDL Input) (P0705): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by internal mechanical wear (clutches, torque converter), wiring or connector faults in the valve body harness, valve body wear.
• P0706 — OBD2 code P0706 flags a problem with the automatic transmission control (transmission range sensor a circuit range/performance). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, faulty transmission speed sensor, wiring or connector faults in the valve body harness.