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.

P2087 — P2087 — Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 2. 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, open or shorted wiring in the circuit.
P208A — P208A — Reductant Pump Control Circuit/Open. 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.
P208B — OBD2 code P208B flags a problem with the sensor and actuator circuits (reductant pump control range/performance). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit, control module driver fault.
P208C — OBD2 code P208C flags a problem with the sensor and actuator circuits (reductant pump control circuit low). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
P208D — OBD2 code P208D flags a problem with the sensor and actuator circuits (reductant pump control circuit high). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit, control module driver fault.
P208E — OBD2 code P208E flags a problem with the sensor and actuator circuits (reductant injection valve stuck closed bank 1 unit 1). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, open or shorted wiring in the circuit, corroded, loose or damaged connector.
P208F — Reductant Injection Valve Stuck Closed Bank 2 Unit 1 (P208F): 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, faulty sensor or actuator of the affected circuit.
P2091 — P2091 — B Camshaft Position Actuator Control Circuit High Bank 1. A fault in the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Typical causes: faulty camshaft position sensor, worn cam phaser, worn timing chain/belt or jumped timing.
P2092 — A Camshaft Position Actuator Control Circuit Low Bank 2 (P2092): 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 faulty camshaft position sensor, low or dirty engine oil affecting VVT, worn cam phaser.
P2093 — A Camshaft Position Actuator Control Circuit High Bank 2 (P2093): 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, worn cam phaser, stuck or clogged VVT oil control valve (OCV).
P2094 — P2094 — B Camshaft Position Actuator Control Circuit Low Bank 2. 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, worn cam phaser.
P2095 — P2095 — B Camshaft Position Actuator Control Circuit High Bank 2. A fault in the camshaft position and variable valve timing. Short, gentle driving to a shop is usually possible. Typical causes: worn cam phaser, faulty camshaft position sensor, worn timing chain/belt or jumped timing.
P209A — Reductant Injection Air Pressure Sensor "B" Circuit (P209A): 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 faulty sensor or actuator of the affected circuit, poor ground connection, blown fuse feeding the circuit.
P209B — P209B — Reductant Injection Air Pressure Sensor "B" Circuit Range/Performance. 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, corroded, loose or damaged connector.
P209C — P209C — Reductant Injection Air Pressure Sensor "B" Circuit Low. 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, faulty sensor or actuator of the affected circuit, control module driver fault.
P209D — P209D — Reductant Injection Air Pressure Sensor "B" Circuit High. 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, blown fuse feeding the circuit.
P209E — P209E — Reductant Injection Air Pressure Sensor "A"/"B" Correlation. 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.
P209F — Reductant Tank Heater Control Circuit Performance (P209F): 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, corroded, loose or damaged connector, blown fuse feeding the circuit.
P20A0 — OBD2 code P20A0 flags a problem with the evaporative emission (EVAP) system (reductant purge control valve circuit /open). The car is usually drivable while you plan the repair. Common culprits: faulty vent valve or leak detection pump, saturated or damaged charcoal canister, small leak in the fuel tank or filler neck.
P20A1 — OBD2 code P20A1 flags a problem with the evaporative emission (EVAP) system (reductant purge control valve performance). The car is usually drivable while you plan the repair. Common culprits: cracked EVAP hoses or lines, loose, damaged or wrong fuel cap, faulty vent valve or leak detection pump.
P20A2 — Reductant Purge Control Valve Circuit Low (P20A2): a powertrain (engine/transmission) fault affecting the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Most often caused by faulty purge valve (canister purge solenoid), saturated or damaged charcoal canister, cracked EVAP hoses or lines.
P20A3 — P20A3 — Reductant Purge Control Valve Circuit High. A fault in the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Typical causes: saturated or damaged charcoal canister, faulty vent valve or leak detection pump, small leak in the fuel tank or filler neck.
P20A4 — Reductant Purge Control Valve Stuck Open (P20A4): a powertrain (engine/transmission) fault affecting the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Most often caused by faulty purge valve (canister purge solenoid), saturated or damaged charcoal canister, faulty vent valve or leak detection pump.
P20A5 — OBD2 code P20A5 flags a problem with the evaporative emission (EVAP) system (reductant purge control valve stuck closed). The car is usually drivable while you plan the repair. Common culprits: small leak in the fuel tank or filler neck, saturated or damaged charcoal canister, loose, damaged or wrong fuel cap.