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

• P247C — Exhaust Gas Temperature Out of Range Bank 2 Sensor 1 (P247C): 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, corroded, loose or damaged connector, poor ground connection.
• P247D — Exhaust Gas Temperature Out of Range Bank 2 Sensor 2 (P247D): 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, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P247E — P247E — Exhaust Gas Temperature Out of Range Bank 2 Sensor 3. 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, blown fuse feeding the circuit.
• P247F — Exhaust Gas Temperature Out of Range Bank 2 Sensor 4 (P247F): 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 control module driver fault, open or shorted wiring in the circuit, poor ground connection.
• P2480 — OBD2 code P2480 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit/open bank 1 sensor 5). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
• P2481 — P2481 — Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 5. 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.
• P2482 — OBD2 code P2482 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit high bank 1 sensor 5). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, poor ground connection, faulty sensor or actuator of the affected circuit.
• P2483 — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 5 (P2483): 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, control module driver fault, corroded, loose or damaged connector.
• P2484 — Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 1 Sensor 5 (P2484): 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, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
• P2485 — OBD2 code P2485 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit/open bank 2 sensor 5). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, open or shorted wiring in the circuit, control module driver fault.
• P2486 — OBD2 code P2486 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit low bank 2 sensor 5). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, blown fuse feeding the circuit, poor ground connection.
• P2488 — Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 5 (P2488): 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, poor ground connection, blown fuse feeding the circuit.
• P2500 — OBD2 code P2500 flags a problem with the sensor and actuator circuits (generator lamp/l-terminal circuit low). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, control module driver fault, blown fuse feeding the circuit.
• P2501 — Generator Lamp/L-Terminal Circuit High (P2501): 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, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P2503 — P2503 — Charging System Voltage 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, open or shorted wiring in the circuit, poor ground connection.
• P2504 — OBD2 code P2504 flags a problem with the sensor and actuator circuits (charging system voltage high). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, poor ground connection, control module driver fault.
• P2505 — P2505 — ECM/PCM Power Input Signal. 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, control module driver fault, corroded, loose or damaged connector.
• P2506 — P2506 — ECM/PCM Power Input Signal Range/Performance. 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, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P2507 — OBD2 code P2507 flags a problem with the sensor and actuator circuits (ECM/PCM power input signal low). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, control module driver fault, corroded, loose or damaged connector.
• P2508 — P2508 — ECM/PCM Power Input Signal High. 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, blown fuse feeding the circuit.
• P2509 — OBD2 code P2509 flags a problem with the sensor and actuator circuits (ECM/PCM power input signal intermittent). 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.
• P250A — P250A — Engine Oil Level Sensor Circuit. 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, open or shorted wiring in the circuit.
• P250B — Engine Oil Level Sensor Circuit Range/Performance (P250B): 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 control module driver fault, open or shorted wiring in the circuit, poor ground connection.
• P250C — P250C — Engine Oil Level Sensor 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, blown fuse feeding the circuit.