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

• P0A21 — OBD2 code P0A21 flags a problem with the sensor and actuator circuits (motor torque sensor circuit intermittent). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
• P0A22 — Generator Torque Sensor Circuit (P0A22): 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, blown fuse feeding the circuit, poor ground connection.
• P0A23 — Generator Torque Sensor Circuit Range/Performance (P0A23): 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, control module driver fault, open or shorted wiring in the circuit.
• P0A24 — OBD2 code P0A24 flags a problem with the sensor and actuator circuits (generator torque sensor circuit low). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, open or shorted wiring in the circuit.
• P0A25 — OBD2 code P0A25 flags a problem with the sensor and actuator circuits (generator torque sensor circuit high). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, control module driver fault.
• P0A26 — OBD2 code P0A26 flags a problem with the sensor and actuator circuits (generator torque sensor circuit intermittent). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, blown fuse feeding the circuit.
• P0A27 — P0A27 — Hybrid Battery Power Off Circuit. 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, open or shorted wiring in the circuit, poor ground connection.
• P0A28 — OBD2 code P0A28 flags a problem with the sensor and actuator circuits (hybrid battery power off circuit low). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P0A29 — OBD2 code P0A29 flags a problem with the sensor and actuator circuits (hybrid battery power off circuit high). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, blown fuse feeding the circuit, control module driver fault.
• P0A2A — Drive Motor "A" Temperature Sensor Circuit (P0A2A): 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, corroded, loose or damaged connector, poor ground connection.
• P0A2B — P0A2B — Drive Motor "A" Temperature Sensor Circuit Range/Performance. 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, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• P0A2C — P0A2C — Drive Motor "A" Temperature 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, poor ground connection, blown fuse feeding the circuit.
• P0A2D — Drive Motor "A" Temperature Sensor Circuit High (P0A2D): 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, control module driver fault.
• P0A2E — Drive Motor "A" Temperature Sensor Circuit Intermittent (P0A2E): 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, control module driver fault.
• P0A2F — Drive Motor "A" Over Temperature (P0A2F): 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, faulty sensor or actuator of the affected circuit.
• P0A30 — Drive Motor "B" Temperature Sensor Circuit (P0A30): 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, open or shorted wiring in the circuit.
• P0A31 — P0A31 — Drive Motor "B" Temperature Sensor 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, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
• P0A32 — P0A32 — Drive Motor "B" Temperature Sensor Circuit Low. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, corroded, loose or damaged connector, control module driver fault.
• P0A33 — OBD2 code P0A33 flags a problem with the sensor and actuator circuits (drive motor "B" temperature sensor circuit high). 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.
• P0A34 — P0A34 — Drive Motor "B" Temperature Sensor Circuit Intermittent. 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, control module driver fault, blown fuse feeding the circuit.
• P0A35 — OBD2 code P0A35 flags a problem with the sensor and actuator circuits (drive motor "B" over temperature). 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.
• P0A36 — P0A36 — Generator Temperature 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, open or shorted wiring in the circuit, poor ground connection.
• P0A37 — Generator Temperature Sensor Circuit Range/Performance (P0A37): 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, control module driver fault, faulty sensor or actuator of the affected circuit.
• P0A38 — OBD2 code P0A38 flags a problem with the sensor and actuator circuits (generator temperature sensor circuit low). 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.