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

• P0828 — Up and Down Shift Switch Circuit High (P0828): 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, faulty sensor or actuator of the affected circuit.
• P0829 — P0829 — 5-6 Shift Malfunction. 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, corroded, loose or damaged connector.
• P082A — P082A — Gear Lever X Position 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, faulty sensor or actuator of the affected circuit, control module driver fault.
• P082B — Gear Lever X Position Circuit Low (P082B): 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, control module driver fault.
• P082C — OBD2 code P082C flags a problem with the sensor and actuator circuits (gear lever x position 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, control module driver fault.
• P082D — P082D — Gear Lever Y 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, corroded, loose or damaged connector, poor ground connection.
• P082E — P082E — Gear Lever Y 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, control module driver fault, faulty sensor or actuator of the affected circuit.
• P082F — P082F — Gear Lever Y 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, control module driver fault, blown fuse feeding the circuit.
• P0830 — Clutch Pedal Switch "A" Circuit (P0830): 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, control module driver fault, open or shorted wiring in the circuit.
• P0831 — OBD2 code P0831 flags a problem with the sensor and actuator circuits (clutch pedal switch "A" 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, poor ground connection.
• P0832 — OBD2 code P0832 flags a problem with the sensor and actuator circuits (clutch pedal switch "A" circuit high). The car is usually drivable while you plan the repair. Common culprits: control module driver fault, poor ground connection, corroded, loose or damaged connector.
• P0833 — Clutch Pedal Switch "B" Circuit (P0833): 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, control module driver fault.
• P0834 — Clutch Pedal Switch "B" Circuit Low (P0834): 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.
• P0835 — P0835 — Clutch Pedal Switch "B" 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, open or shorted wiring in the circuit, blown fuse feeding the circuit.
• P0836 — P0836 — Four Wheel Drive (4WD) 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, control module driver fault, faulty sensor or actuator of the affected circuit.
• P0837 — OBD2 code P0837 flags a problem with the sensor and actuator circuits (four wheel drive (4WD) switch circuit range/performance). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, blown fuse feeding the circuit, poor ground connection.
• P0838 — OBD2 code P0838 flags a problem with the sensor and actuator circuits (four wheel drive (4WD) switch circuit low). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, control module driver fault, open or shorted wiring in the circuit.
• P0839 — Four Wheel Drive (4WD) Switch Circuit High (P0839): 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, faulty sensor or actuator of the affected circuit, control module driver fault.
• P083A — P083A — Transmission Fluid Pressure Sensor/Switch "G" Circuit. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: valve body wear, wiring or connector faults in the valve body harness, low or degraded transmission fluid.
• P083B — OBD2 code P083B flags a problem with the automatic transmission control (transmission fluid pressure sensor/switch "G" circuit range/performance). Short, gentle driving to a shop is usually possible. Common culprits: faulty transmission speed sensor, valve body wear, wiring or connector faults in the valve body harness.
• P083C — Transmission Fluid Pressure Sensor/Switch "G" Circuit Low (P083C): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by valve body wear, low or degraded transmission fluid, internal mechanical wear (clutches, torque converter).
• P083D — P083D — Transmission Fluid Pressure Sensor/Switch "G" Circuit High. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: failed shift or pressure control solenoid, internal mechanical wear (clutches, torque converter), low or degraded transmission fluid.
• P083E — Transmission Fluid Pressure Sensor/Switch "G" Circuit Intermittent (P083E): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by valve body wear, low or degraded transmission fluid, internal mechanical wear (clutches, torque converter).
• P083F — P083F — Clutch Pedal Switch "A"/"B" Correlation. 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, blown fuse feeding the circuit, open or shorted wiring in the circuit.