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.

P0C35 — P0C35 — Hybrid Battery Temperature Sensor "F" 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, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
P0C36 — P0C36 — Hybrid Battery Temperature Sensor "F" 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, blown fuse feeding the circuit, control module driver fault.
P0C37 — OBD2 code P0C37 flags a problem with the sensor and actuator circuits (hybrid battery temperature sensor "F" circuit intermittent/erratic). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, control module driver fault.
P0C38 — P0C38 — DC/DC Converter Temperature Sensor "A" 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, poor ground connection, faulty sensor or actuator of the affected circuit.
P0C39 — OBD2 code P0C39 flags a problem with the sensor and actuator circuits (DC/DC converter temperature sensor "A" range/performance). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, control module driver fault, poor ground connection.
P0C3A — P0C3A — DC/DC Converter Temperature Sensor "A" 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, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
P0C3B — OBD2 code P0C3B flags a problem with the sensor and actuator circuits (DC/DC converter temperature sensor "A" high). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, control module driver fault, poor ground connection.
P0C3C — OBD2 code P0C3C flags a problem with the sensor and actuator circuits (DC/DC converter temperature sensor "A" intermittent/erratic). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
P0C3D — OBD2 code P0C3D flags a problem with the sensor and actuator circuits (DC/DC converter temperature sensor "B" circuit). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, poor ground connection, faulty sensor or actuator of the affected circuit.
P0C3E — OBD2 code P0C3E flags a problem with the sensor and actuator circuits (DC/DC converter temperature sensor "B" 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, poor ground connection.
P0C3F — OBD2 code P0C3F flags a problem with the sensor and actuator circuits (DC/DC converter temperature sensor "B" low). 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, control module driver fault.
P0C40 — P0C40 — DC/DC Converter Temperature Sensor "B" High. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, open or shorted wiring in the circuit, blown fuse feeding the circuit.
P0C41 — P0C41 — DC/DC Converter Temperature Sensor "B" Intermittent/Erratic. 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, poor ground connection.
P0C42 — Hybrid Battery Pack Coolant Temperature Sensor Circuit (P0C42): a powertrain (engine/transmission) fault affecting the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Most often caused by failed cooling fan or fan relay, thermostat stuck open or closed, wiring faults in the sensor circuit.
P0C43 — Hybrid Battery Pack Coolant Temperature Sensor Circuit Range/Performance (P0C43): a powertrain (engine/transmission) fault affecting the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Most often caused by water pump or radiator issues, wiring faults in the sensor circuit, failed cooling fan or fan relay.
P0C44 — Hybrid Battery Pack Coolant Temperature Sensor Circuit Low (P0C44): a powertrain (engine/transmission) fault affecting the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Most often caused by failed cooling fan or fan relay, wiring faults in the sensor circuit, thermostat stuck open or closed.
P0C45 — Hybrid Battery Pack Coolant Temperature Sensor Circuit High (P0C45): a powertrain (engine/transmission) fault affecting the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Most often caused by failed cooling fan or fan relay, low coolant level or air in the system, water pump or radiator issues.
P0C46 — OBD2 code P0C46 flags a problem with the engine cooling and temperature control (hybrid battery pack coolant temperature sensor circuit intermittent/erratic). Short, gentle driving to a shop is usually possible. Common culprits: faulty coolant temperature sensor, water pump or radiator issues, failed cooling fan or fan relay.
P0C47 — OBD2 code P0C47 flags a problem with the engine cooling and temperature control (hybrid battery pack coolant pump control circuit/open). Short, gentle driving to a shop is usually possible. Common culprits: wiring faults in the sensor circuit, water pump or radiator issues, low coolant level or air in the system.
P0C48 — OBD2 code P0C48 flags a problem with the engine cooling and temperature control (hybrid battery pack coolant pump control circuit low). Short, gentle driving to a shop is usually possible. Common culprits: thermostat stuck open or closed, water pump or radiator issues, failed cooling fan or fan relay.
P0C49 — P0C49 — Hybrid Battery Pack Coolant Pump Control Circuit High. A fault in the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Typical causes: failed cooling fan or fan relay, low coolant level or air in the system, thermostat stuck open or closed.
P0C4A — Hybrid Battery Pack Coolant Pump Control Performance (P0C4A): a powertrain (engine/transmission) fault affecting the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Most often caused by water pump or radiator issues, failed cooling fan or fan relay, faulty coolant temperature sensor.
P0C4B — Hybrid Battery Pack Coolant Pump Supply Voltage Circuit/Open (P0C4B): a powertrain (engine/transmission) fault affecting the engine cooling and temperature control. Short, gentle driving to a shop is usually possible. Most often caused by thermostat stuck open or closed, low coolant level or air in the system, faulty coolant temperature sensor.
P0C4C — OBD2 code P0C4C flags a problem with the engine cooling and temperature control (hybrid battery pack coolant pump supply voltage circuit low). Short, gentle driving to a shop is usually possible. Common culprits: failed cooling fan or fan relay, water pump or radiator issues, thermostat stuck open or closed.