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

• P080D — OBD2 code P080D flags a problem with the automatic transmission control (upshift/skip shift solenoid control circuit high). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, wiring or connector faults in the valve body harness, faulty transmission speed sensor.
• P0810 — OBD2 code P0810 flags a problem with the sensor and actuator circuits (clutch position control error). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, poor ground connection, control module driver fault.
• P0811 — P0811 — Excessive Clutch Slippage. 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.
• P0812 — Reverse Input Circuit (P0812): 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, corroded, loose or damaged connector.
• P0813 — P0813 — Reverse Output 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, blown fuse feeding the circuit, faulty sensor or actuator of the affected circuit.
• P0814 — OBD2 code P0814 flags a problem with the automatic transmission control (transmission range display circuit). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, low or degraded transmission fluid, failed shift or pressure control solenoid.
• P0815 — P0815 — Upshift Switch 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, faulty sensor or actuator of the affected circuit, control module driver fault.
• P0816 — OBD2 code P0816 flags a problem with the sensor and actuator circuits (downshift switch circuit). 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.
• P0817 — OBD2 code P0817 flags a problem with the sensor and actuator circuits (starter disable circuit). 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, blown fuse feeding the circuit.
• P0818 — OBD2 code P0818 flags a problem with the sensor and actuator circuits (driveline disconnect switch input circuit). 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, control module driver fault.
• P0819 — Up and Down Shift Switch to Transmission Range Correlation (P0819): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid, wiring or connector faults in the valve body harness.
• P081A — OBD2 code P081A flags a problem with the sensor and actuator circuits (starter disable circuit low). 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.
• P081B — Starter Disable Circuit High (P081B): 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, poor ground connection, corroded, loose or damaged connector.
• P081C — Park Input Circuit (P081C): 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, poor ground connection, corroded, loose or damaged connector.
• P081D — P081D — Neutral Input Circuit. 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, corroded, loose or damaged connector.
• P081E — Excessive Clutch "B" Slippage (P081E): 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, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
• P0820 — Gear Lever X-Y Position Sensor Circuit (P0820): 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, blown fuse feeding the circuit, corroded, loose or damaged connector.
• P0821 — Gear Lever X Position Circuit (P0821): 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, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
• P0822 — Gear Lever Y Position Circuit (P0822): 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, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
• P0823 — OBD2 code P0823 flags a problem with the sensor and actuator circuits (gear lever x position circuit intermittent). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.
• P0824 — Gear Lever Y Position Circuit Intermittent (P0824): 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.
• P0825 — P0825 — Gear Lever Push-Pull Switch (Shift Anticipate). 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, faulty sensor or actuator of the affected circuit.
• P0826 — P0826 — Up and Down Shift Switch 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, blown fuse feeding the circuit, control module driver fault.
• P0827 — Up and Down Shift Switch Circuit Low (P0827): 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, poor ground connection, open or shorted wiring in the circuit.