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

• P2820 — Pressure Control Solenoid "J" Performance/Stuck Off (P2820): 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, failed shift or pressure control solenoid.
• P2821 — OBD2 code P2821 flags a problem with the automatic transmission control (pressure control solenoid "J" stuck on). Short, gentle driving to a shop is usually possible. Common culprits: wiring or connector faults in the valve body harness, failed shift or pressure control solenoid, internal mechanical wear (clutches, torque converter).
• P2822 — Pressure Control Solenoid "J" Electrical (P2822): 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, faulty transmission speed sensor, wiring or connector faults in the valve body harness.
• P2823 — OBD2 code P2823 flags a problem with the automatic transmission control (pressure control solenoid "J" intermittent). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, low or degraded transmission fluid, faulty transmission speed sensor.
• P2824 — Pressure Control Solenoid "J" Control Circuit/Open (P2824): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by faulty transmission speed sensor, wiring or connector faults in the valve body harness, valve body wear.
• P2825 — P2825 — Pressure Control Solenoid "J" Control Circuit Range/Performance. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: valve body wear, low or degraded transmission fluid, internal mechanical wear (clutches, torque converter).
• P2826 — Pressure Control Solenoid "J" Control Circuit Low (P2826): 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, valve body wear.
• P2827 — OBD2 code P2827 flags a problem with the automatic transmission control (pressure control solenoid "J" control circuit high). Short, gentle driving to a shop is usually possible. Common culprits: failed shift or pressure control solenoid, faulty transmission speed sensor, low or degraded transmission fluid.
• P2828 — P2828 — Pressure Control Solenoid "K". A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: failed shift or pressure control solenoid, wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter).
• P282A — Pressure Control Solenoid "K" Stuck On (P282A): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by failed shift or pressure control solenoid, faulty transmission speed sensor, valve body wear.
• P282B — P282B — Pressure Control Solenoid "K" Electrical. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: faulty transmission speed sensor, internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid.
• P282C — Pressure Control Solenoid "K" Intermittent (P282C): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by failed shift or pressure control solenoid, low or degraded transmission fluid, internal mechanical wear (clutches, torque converter).
• P282D — P282D — Pressure Control Solenoid "K" Control Circuit/Open. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: valve body wear, low or degraded transmission fluid, faulty transmission speed sensor.
• P282E — Pressure Control Solenoid "K" Control Circuit Range/Performance (P282E): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by failed shift or pressure control solenoid, low or degraded transmission fluid, wiring or connector faults in the valve body harness.
• P282F — OBD2 code P282F flags a problem with the automatic transmission control (pressure control solenoid "K" control circuit low). Short, gentle driving to a shop is usually possible. Common culprits: internal mechanical wear (clutches, torque converter), wiring or connector faults in the valve body harness, faulty transmission speed sensor.
• P2830 — P2830 — Pressure Control Solenoid "K" Control Circuit High. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter), valve body wear.
• P2831 — Shift Fork "A" Position Circuit (P2831): 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.
• P2832 — Shift Fork "A" Position Circuit Range/Performance (P2832): 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, corroded, loose or damaged connector.
• P2834 — OBD2 code P2834 flags a problem with the sensor and actuator circuits (shift fork "A" position circuit high). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
• P2835 — P2835 — Shift Fork "A" 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, poor ground connection, corroded, loose or damaged connector.
• P2836 — OBD2 code P2836 flags a problem with the sensor and actuator circuits (shift fork "B" position circuit). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, open or shorted wiring in the circuit, control module driver fault.
• P2837 — Shift Fork "B" Position Circuit Range/Performance (P2837): 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, corroded, loose or damaged connector, poor ground connection.
• P2838 — P2838 — Shift Fork "B" 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, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.
• P283A — Shift Fork "B" Position Circuit Intermittent (P283A): 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, control module driver fault, poor ground connection.