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

• P0B13 — P0B13 — Hybrid Battery Pack Current Sensor "A"/"B" Correlation. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: control module driver fault, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
• P0B14 — Hybrid Battery Pack Voltage Sense "B" Circuit (P0B14): 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, poor ground connection.
• P0B15 — Hybrid Battery Pack Voltage Sense "B" Circuit Range/Performance (P0B15): 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, poor ground connection.
• P0B16 — Hybrid Battery Pack Voltage Sense "B" Circuit Low (P0B16): 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, control module driver fault.
• P0B17 — Hybrid Battery Pack Voltage Sense "B" Circuit High (P0B17): 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, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
• P0B18 — OBD2 code P0B18 flags a problem with the sensor and actuator circuits (hybrid battery pack voltage sense "B" circuit intermittent/erratic). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, blown fuse feeding the circuit.
• P0B19 — OBD2 code P0B19 flags a problem with the sensor and actuator circuits (hybrid battery pack voltage sense "C" circuit). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P0B1A — Hybrid Battery Pack Voltage Sense "C" Circuit Range/Performance (P0B1A): 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, faulty sensor or actuator of the affected circuit.
• P0B1B — OBD2 code P0B1B flags a problem with the sensor and actuator circuits (hybrid battery pack voltage sense "C" circuit low). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P0B1C — P0B1C — Hybrid Battery Pack Voltage Sense "C" Circuit High. 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, poor ground connection.
• P0B1D — Hybrid Battery Pack Voltage Sense "C" Circuit Intermittent/Erratic (P0B1D): 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, corroded, loose or damaged connector.
• P0B1E — OBD2 code P0B1E flags a problem with the sensor and actuator circuits (hybrid battery pack voltage sense "D" circuit). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, poor ground connection, control module driver fault.
• P0B1F — OBD2 code P0B1F flags a problem with the sensor and actuator circuits (hybrid battery pack voltage sense "D" circuit range/performance). 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.
• P0B20 — OBD2 code P0B20 flags a problem with the sensor and actuator circuits (hybrid battery pack voltage sense "D" circuit low). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, control module driver fault, open or shorted wiring in the circuit.
• P0B21 — OBD2 code P0B21 flags a problem with the sensor and actuator circuits (hybrid battery pack voltage sense "D" circuit high). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
• P0B22 — P0B22 — Hybrid Battery Pack Voltage Sense "D" 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, faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector.
• P0B23 — P0B23 — Hybrid Battery "A" 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, open or shorted wiring in the circuit, control module driver fault.
• P0B24 — Hybrid Battery "A" Voltage Unstable (P0B24): 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, open or shorted wiring in the circuit.
• P0B25 — OBD2 code P0B25 flags a problem with the sensor and actuator circuits (hybrid battery "A" voltage low). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, corroded, loose or damaged connector.
• P0B26 — OBD2 code P0B26 flags a problem with the sensor and actuator circuits (hybrid battery "A" voltage high). 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, open or shorted wiring in the circuit.
• P0B27 — OBD2 code P0B27 flags a problem with the sensor and actuator circuits (hybrid battery "B" voltage). 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.
• P0B28 — Hybrid Battery "B" Voltage Unstable (P0B28): 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, open or shorted wiring in the circuit.
• P0B29 — P0B29 — Hybrid Battery "B" Voltage 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, blown fuse feeding the circuit.
• P0B2A — OBD2 code P0B2A flags a problem with the sensor and actuator circuits (hybrid battery "B" voltage high). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.