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

• P0AE3 — Hybrid Battery Precharge Contactor Circuit Stuck Open (P0AE3): 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.
• P0AE4 — OBD2 code P0AE4 flags a problem with the sensor and actuator circuits (hybrid battery precharge contactor control circuit). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, poor ground connection, corroded, loose or damaged connector.
• P0AE5 — Range/Performance (P0AE5): 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, open or shorted wiring in the circuit, control module driver fault.
• P0AE6 — P0AE6 — Hybrid Battery Precharge Contactor Control Circuit Low. 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.
• P0AE7 — OBD2 code P0AE7 flags a problem with the sensor and actuator circuits (hybrid battery precharge contactor control circuit high). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, control module driver fault, open or shorted wiring in the circuit.
• P0AE8 — OBD2 code P0AE8 flags a problem with the sensor and actuator circuits (hybrid battery temperature sensor "D" circuit). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit, poor ground connection.
• P0AE9 — Hybrid Battery Temperature Sensor "D" Range/Performance (P0AE9): 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, poor ground connection, blown fuse feeding the circuit.
• P0AEA — OBD2 code P0AEA flags a problem with the sensor and actuator circuits (hybrid battery temperature sensor "D" circuit low). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, poor ground connection, control module driver fault.
• P0AEB — Hybrid Battery Temperature Sensor "D" Circuit High (P0AEB): 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, control module driver fault.
• P0AEC — Hybrid Battery Temperature Sensor "D" Circuit Intermittent/Erratic (P0AEC): 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, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
• P0AED — OBD2 code P0AED flags a problem with the sensor and actuator circuits (drive motor inverter temperature sensor "A" circuit). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
• P0AEE — Range/Performance (P0AEE): 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, control module driver fault, faulty sensor or actuator of the affected circuit.
• P0AEF — P0AEF — Drive Motor Inverter Temperature Sensor "A" 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, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
• P0AF0 — Drive Motor Inverter Temperature Sensor "A" Circuit High (P0AF0): 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, poor ground connection.
• P0AF1 — P0AF1 — Intermittent/Erratic. 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, poor ground connection.
• P0AF2 — Drive Motor Inverter Temperature Sensor "B" Circuit (P0AF2): 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, control module driver fault, open or shorted wiring in the circuit.
• P0AF3 — Range/Performance (P0AF3): 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, blown fuse feeding the circuit.
• P0AF4 — P0AF4 — Drive Motor Inverter Temperature Sensor "B" Circuit Low. 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, faulty sensor or actuator of the affected circuit.
• P0AF5 — OBD2 code P0AF5 flags a problem with the sensor and actuator circuits (drive motor inverter temperature sensor "B" circuit high). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, open or shorted wiring in the circuit, corroded, loose or damaged connector.
• P0AF6 — Intermittent/Erratic (P0AF6): 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, control module driver fault, poor ground connection.
• P0AF7 — OBD2 code P0AF7 flags a problem with the sensor and actuator circuits (14 volt power module internal temperature too high). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
• P0AF8 — P0AF8 — Hybrid Battery System Voltage. 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.
• P0AF9 — P0AF9 — Hybrid Battery System Voltage Unstable. 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, faulty sensor or actuator of the affected circuit.
• P0AFA — Hybrid Battery System Voltage Low (P0AFA): 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, open or shorted wiring in the circuit.