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

• P0B73 — P0B73 — Hybrid Battery Voltage Sense "L" Circuit 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, blown fuse feeding the circuit, control module driver fault.
• P0B74 — Hybrid Battery Voltage Sense "L" Circuit Low (P0B74): 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, faulty sensor or actuator of the affected circuit.
• P0B75 — Hybrid Battery Voltage Sense "L" Circuit High (P0B75): 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.
• P0B76 — Hybrid Battery Voltage Sense "L" Circuit Intermittent/Erratic (P0B76): 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, open or shorted wiring in the circuit.
• P0B77 — P0B77 — Hybrid Battery Voltage Sense "M" Circuit. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, control module driver fault, blown fuse feeding the circuit.
• P0B78 — Hybrid Battery Voltage Sense "M" Circuit Range/Performance (P0B78): 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, corroded, loose or damaged connector.
• P0B79 — OBD2 code P0B79 flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "M" circuit low). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, blown fuse feeding the circuit, corroded, loose or damaged connector.
• P0B7A — P0B7A — Hybrid Battery Voltage Sense "M" Circuit High. 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, corroded, loose or damaged connector, poor ground connection.
• P0B7B — OBD2 code P0B7B flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "M" circuit intermittent/erratic). 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.
• P0B7C — OBD2 code P0B7C flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "N" circuit). 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.
• P0B7D — OBD2 code P0B7D flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "N" circuit range/performance). 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.
• P0B7E — P0B7E — Hybrid Battery Voltage Sense "N" 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, open or shorted wiring in the circuit, control module driver fault.
• P0B7F — P0B7F — Hybrid Battery Voltage Sense "N" Circuit High. 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.
• P0B80 — Hybrid Battery Voltage Sense "N" Circuit Intermittent/Erratic (P0B80): 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, faulty sensor or actuator of the affected circuit.
• P0B81 — OBD2 code P0B81 flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "O" circuit). 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.
• P0B82 — Hybrid Battery Voltage Sense "O" Circuit Range/Performance (P0B82): 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, faulty sensor or actuator of the affected circuit, control module driver fault.
• P0B83 — Hybrid Battery Voltage Sense "O" Circuit Low (P0B83): 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.
• P0B84 — OBD2 code P0B84 flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "O" circuit high). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit, poor ground connection.
• P0B85 — P0B85 — Hybrid Battery Voltage Sense "O" Circuit Intermittent/Erratic. 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, control module driver fault, faulty sensor or actuator of the affected circuit.
• P0B86 — OBD2 code P0B86 flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "P" circuit). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, faulty sensor or actuator of the affected circuit.
• P0B87 — Hybrid Battery Voltage Sense "P" Circuit Range/Performance (P0B87): 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, open or shorted wiring in the circuit, poor ground connection.
• P0B88 — OBD2 code P0B88 flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "P" circuit 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, open or shorted wiring in the circuit.
• P0B89 — OBD2 code P0B89 flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "P" circuit high). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, control module driver fault, faulty sensor or actuator of the affected circuit.
• P0B8A — OBD2 code P0B8A flags a problem with the sensor and actuator circuits (hybrid battery voltage sense "P" circuit intermittent/erratic). 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.