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

• P0363 — OBD2 code P0363 flags a problem with the engine misfire monitoring (misfire detected - fueling disabled). Short, gentle driving to a shop is usually possible. Common culprits: failed ignition coil or coil wiring, faulty crankshaft/camshaft position signal, vacuum leak in the intake.
• P0364 — Reserved (P0364): 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 corroded, loose or damaged connector, blown fuse feeding the circuit, control module driver fault.
• P0365 — P0365 — Camshaft Position Sensor "B" Circuit (Bank 1). A fault in the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Typical causes: stuck or clogged VVT oil control valve (OCV), damaged sensor wiring or reluctor ring, worn cam phaser.
• P0366 — Camshaft Position Sensor "B" Circuit Range/Performance (Bank 1) (P0366): a powertrain (engine/transmission) fault affecting the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Most often caused by low or dirty engine oil affecting VVT, faulty camshaft position sensor, stuck or clogged VVT oil control valve (OCV).
• P0367 — P0367 — Camshaft Position Sensor "B" Circuit Low (Bank 1). A fault in the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Typical causes: stuck or clogged VVT oil control valve (OCV), faulty camshaft position sensor, damaged sensor wiring or reluctor ring.
• P0368 — Camshaft Position Sensor "B" Circuit High (Bank 1) (P0368): a powertrain (engine/transmission) fault affecting the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Most often caused by damaged sensor wiring or reluctor ring, worn timing chain/belt or jumped timing, worn cam phaser.
• P0369 — P0369 — Camshaft Position Sensor "B" Circuit Intermittent (Bank 1). A fault in the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Typical causes: stuck or clogged VVT oil control valve (OCV), low or dirty engine oil affecting VVT, worn timing chain/belt or jumped timing.
• P0370 — P0370 — Timing Reference High Resolution Signal A Malfunction. 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, control module driver fault, open or shorted wiring in the circuit.
• P0371 — P0371 — Timing Reference High Resolution Signal A Too Many Pulses. 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, poor ground connection, control module driver fault.
• P0372 — Timing Reference High Resolution Signal A Too Few Pulses (P0372): 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 corroded, loose or damaged connector, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
• P0373 — OBD2 code P0373 flags a problem with the sensor and actuator circuits (timing reference high resolution signal a intermittent/erratic pulses). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, control module driver fault, poor ground connection.
• P0374 — Timing Reference High Resolution Signal A No Pulses (P0374): 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, poor ground connection.
• P0375 — OBD2 code P0375 flags a problem with the sensor and actuator circuits (timing reference high resolution signal b malfunction). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, open or shorted wiring in the circuit, control module driver fault.
• P0376 — P0376 — Timing Reference High Resolution Signal B Too Many Pulses. 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, poor ground connection, blown fuse feeding the circuit.
• P0377 — Timing Reference High Resolution Signal B Too Few Pulses (P0377): 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 corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
• P0378 — P0378 — Timing Reference High Resolution Signal B Intermittent/Erratic Pulses. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, corroded, loose or damaged connector, open or shorted wiring in the circuit.
• P0379 — Timing Reference High Resolution Signal B No Pulses (P0379): 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 poor ground connection, control module driver fault, open or shorted wiring in the circuit.
• P037D — Glow Plug Sense Circuit (P037D): 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 faulty glow plug relay or control module, burned-out glow plug, damaged glow plug wiring or connector.
• P037E — P037E — Glow Plug Sense Circuit Low. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: corroded glow plug connectors, blown fuse in the glow plug circuit, burned-out glow plug.
• P037F — P037F — Glow Plug Sense Circuit High. 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, burned-out glow plug.
• P0380 — P0380 — Glow Plug/Heater Circuit "A". 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, burned-out glow plug, damaged glow plug wiring or connector.
• P0381 — OBD2 code P0381 flags a problem with the diesel glow plug system (glow plug/heater indicator circuit malfunction). The car is usually drivable while you plan the repair. Common culprits: damaged glow plug wiring or connector, corroded glow plug connectors, burned-out glow plug.
• P0382 — Glow Plug/Heater Circuit "B" (P0382): 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 burned-out glow plug, blown fuse in the glow plug circuit, faulty glow plug relay or control module.
• P0383 — P0383 — Glow Plug Control Module Control Circuit Low. A fault in the diesel glow plug system. The car is usually drivable while you plan the repair. Typical causes: corroded glow plug connectors, faulty glow plug relay or control module, blown fuse in the glow plug circuit.