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

• P283B — OBD2 code P283B flags a problem with the sensor and actuator circuits (shift fork "C" position circuit). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, open or shorted wiring in the circuit.
• P283C — P283C — Shift Fork "C" Position 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, poor ground connection, open or shorted wiring in the circuit.
• P283D — P283D — Shift Fork "C" Position 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.
• P283E — P283E — Shift Fork "C" Position 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, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
• P283F — P283F — Shift Fork "C" Position Circuit Intermittent. 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, poor ground connection.
• P2840 — P2840 — Shift Fork "D" Position 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, control module driver fault, blown fuse feeding the circuit.
• P2841 — P2841 — Shift Fork "D" Position 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, corroded, loose or damaged connector, blown fuse feeding the circuit.
• P2842 — P2842 — Shift Fork "D" Position 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, control module driver fault, poor ground connection.
• P2843 — P2843 — Shift Fork "D" Position 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, open or shorted wiring in the circuit, blown fuse feeding the circuit.
• P2844 — P2844 — Shift Fork "D" Position Circuit Intermittent. 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, corroded, loose or damaged connector, poor ground connection.
• P2845 — P2845 — Shift Fork "A" Position Sensor Incorrect Neutral Position Indicated. 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.
• P2846 — Shift Fork "B" Position Sensor Incorrect Neutral Position Indicated (P2846): 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, blown fuse feeding the circuit.
• P2848 — Shift Fork "D" Position Sensor Incorrect Neutral Position Indicated (P2848): 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, poor ground connection.
• P2849 — OBD2 code P2849 flags a problem with the sensor and actuator circuits (shift fork "A" stuck). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• P284A — P284A — Shift Fork "B" Stuck. 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, faulty sensor or actuator of the affected circuit.
• P284B — OBD2 code P284B flags a problem with the sensor and actuator circuits (shift fork "C" stuck). 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.
• P284C — OBD2 code P284C flags a problem with the sensor and actuator circuits (shift fork "D" stuck). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, blown fuse feeding the circuit, control module driver fault.
• P284D — P284D — Shift Fork "A" Unrequested Movement. 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.
• P284E — Shift Fork "B" Unrequested Movement (P284E): 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, poor ground connection.
• P284F — OBD2 code P284F flags a problem with the sensor and actuator circuits (shift fork "C" unrequested movement). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, blown fuse feeding the circuit, open or shorted wiring in the circuit.
• P2851 — OBD2 code P2851 flags a problem with the sensor and actuator circuits (shift fork position sensor "A"/"B" correlation). 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.
• P2852 — OBD2 code P2852 flags a problem with the sensor and actuator circuits (shift fork position sensor "C"/"D" correlation). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, corroded, loose or damaged connector.
• P2853 — OBD2 code P2853 flags a problem with the sensor and actuator circuits (clutch "A" pressure discharge performance). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, blown fuse feeding the circuit, control module driver fault.
• P2855 — OBD2 code P2855 flags a problem with the sensor and actuator circuits (clutch "A" pressure charge performance). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, blown fuse feeding the circuit, open or shorted wiring in the circuit.