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

• P2801 — OBD2 code P2801 flags a problem with the automatic transmission control (transmission range sensor "B" circuit range/performance). Short, gentle driving to a shop is usually possible. Common culprits: faulty transmission speed sensor, failed shift or pressure control solenoid, valve body wear.
• P2802 — P2802 — Transmission Range Sensor "B" Circuit Low. 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), faulty transmission speed sensor.
• P2804 — OBD2 code P2804 flags a problem with the automatic transmission control (transmission range sensor "B" circuit intermittent). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, wiring or connector faults in the valve body harness, faulty transmission speed sensor.
• P2806 — P2806 — Transmission Range Sensor Alignment. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid, low or degraded transmission fluid.
• P2808 — Pressure Control Solenoid "G" Performance/Stuck Off (P2808): 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, low or degraded transmission fluid.
• P2809 — OBD2 code P2809 flags a problem with the automatic transmission control (pressure control solenoid "G" stuck on). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, failed shift or pressure control solenoid, valve body wear.
• P280A — OBD2 code P280A flags a problem with the automatic transmission control (transmission range sensor "A" circuit not learned). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, low or degraded transmission fluid, internal mechanical wear (clutches, torque converter).
• P280B — OBD2 code P280B flags a problem with the automatic transmission control (transmission range sensor "B" circuit not learned). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid.
• P2810 — P2810 — Pressure Control Solenoid "G" Electrical. 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).
• P2811 — Pressure Control Solenoid "G" Intermittent (P2811): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by wiring or connector faults in the valve body harness, faulty transmission speed sensor, internal mechanical wear (clutches, torque converter).
• P2812 — P2812 — Pressure Control Solenoid "G" Control Circuit/Open. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: low or degraded transmission fluid, wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter).
• P2813 — P2813 — Pressure Control Solenoid "G" 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, internal mechanical wear (clutches, torque converter), low or degraded transmission fluid.
• P2814 — OBD2 code P2814 flags a problem with the automatic transmission control (pressure control solenoid "G" control circuit low). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, faulty transmission speed sensor, valve body wear.
• P2815 — P2815 — Pressure Control Solenoid "G" Control Circuit High. 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.
• P2816 — OBD2 code P2816 flags a problem with the automatic transmission control (pressure control solenoid "H"). Short, gentle driving to a shop is usually possible. Common culprits: faulty transmission speed sensor, wiring or connector faults in the valve body harness, failed shift or pressure control solenoid.
• P2817 — Pressure Control Solenoid "H" Performance/Stuck Off (P2817): 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, wiring or connector faults in the valve body harness, faulty transmission speed sensor.
• P2818 — OBD2 code P2818 flags a problem with the automatic transmission control (pressure control solenoid "H" stuck on). Short, gentle driving to a shop is usually possible. Common culprits: wiring or connector faults in the valve body harness, internal mechanical wear (clutches, torque converter), low or degraded transmission fluid.
• P2819 — OBD2 code P2819 flags a problem with the automatic transmission control (pressure control solenoid "H" electrical). 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.
• P281A — P281A — Pressure Control Solenoid "H" Intermittent. 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, valve body wear, internal mechanical wear (clutches, torque converter).
• P281B — OBD2 code P281B flags a problem with the automatic transmission control (pressure control solenoid "H" control circuit/open). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, faulty transmission speed sensor, failed shift or pressure control solenoid.
• P281C — OBD2 code P281C flags a problem with the automatic transmission control (pressure control solenoid "H" control circuit range/performance). Short, gentle driving to a shop is usually possible. Common culprits: failed shift or pressure control solenoid, valve body wear, wiring or connector faults in the valve body harness.
• P281D — P281D — Pressure Control Solenoid "H" Control Circuit Low. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: internal mechanical wear (clutches, torque converter), valve body wear, failed shift or pressure control solenoid.
• P281E — OBD2 code P281E flags a problem with the automatic transmission control (pressure control solenoid "H" control circuit high). Short, gentle driving to a shop is usually possible. Common culprits: failed shift or pressure control solenoid, wiring or connector faults in the valve body harness, faulty transmission speed sensor.
• P281F — Pressure Control Solenoid "J" (P281F): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by wiring or connector faults in the valve body harness, valve body wear, internal mechanical wear (clutches, torque converter).