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

• P0967 — P0967 — Pressure Control Solenoid "B" 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, wiring or connector faults in the valve body harness, failed shift or pressure control solenoid.
• P0968 — P0968 — Pressure Control Solenoid "C" Control Circuit/Open. 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, faulty transmission speed sensor, low or degraded transmission fluid.
• P0969 — Pressure Control Solenoid "C" Control Circuit Range/Performance (P0969): 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, internal mechanical wear (clutches, torque converter), faulty transmission speed sensor.
• P0970 — Pressure Control Solenoid "C" Control Circuit Low (P0970): 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, internal mechanical wear (clutches, torque converter), failed shift or pressure control solenoid.
• P0971 — P0971 — Pressure Control Solenoid "C" Control 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, faulty transmission speed sensor, wiring or connector faults in the valve body harness.
• P0972 — OBD2 code P0972 flags a problem with the automatic transmission control (shift solenoid "A" control circuit range/performance). 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.
• P0973 — Shift Solenoid "A" Control Circuit Low (P0973): 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), wiring or connector faults in the valve body harness, faulty transmission speed sensor.
• P0974 — Shift Solenoid "A" Control Circuit High (P0974): a powertrain (engine/transmission) fault affecting the automatic transmission control. Short, gentle driving to a shop is usually possible. Most often caused by low or degraded transmission fluid, failed shift or pressure control solenoid, valve body wear.
• P0975 — P0975 — Shift Solenoid "B" Control Circuit Range/Performance. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: faulty transmission speed sensor, wiring or connector faults in the valve body harness, low or degraded transmission fluid.
• P0976 — P0976 — Shift Solenoid "B" Control 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, faulty transmission speed sensor, internal mechanical wear (clutches, torque converter).
• P0977 — P0977 — Shift Solenoid "B" Control 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), faulty transmission speed sensor.
• P0978 — Shift Solenoid "C" Control Circuit Range/Performance (P0978): 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, faulty transmission speed sensor.
• P0979 — OBD2 code P0979 flags a problem with the automatic transmission control (shift solenoid "C" control circuit low). Short, gentle driving to a shop is usually possible. Common culprits: failed shift or pressure control solenoid, valve body wear, internal mechanical wear (clutches, torque converter).
• P0980 — P0980 — Shift Solenoid "C" Control Circuit High. 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, valve body wear.
• P0981 — P0981 — Shift Solenoid "D" Control Circuit Range/Performance. 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, low or degraded transmission fluid, failed shift or pressure control solenoid.
• P0982 — Shift Solenoid "D" Control Circuit Low (P0982): 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, internal mechanical wear (clutches, torque converter), low or degraded transmission fluid.
• P0983 — P0983 — Shift Solenoid "D" 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, failed shift or pressure control solenoid, faulty transmission speed sensor.
• P0984 — Shift Solenoid "E" Control Circuit Range/Performance (P0984): 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, low or degraded transmission fluid.
• P0985 — P0985 — Shift Solenoid "E" Control 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, failed shift or pressure control solenoid, faulty transmission speed sensor.
• P0986 — P0986 — Shift Solenoid "E" 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), wiring or connector faults in the valve body harness.
• P0987 — OBD2 code P0987 flags a problem with the automatic transmission control (transmission fluid pressure sensor/switch "E" circuit). Short, gentle driving to a shop is usually possible. Common culprits: valve body wear, faulty transmission speed sensor, wiring or connector faults in the valve body harness.
• P0988 — OBD2 code P0988 flags a problem with the automatic transmission control (transmission fluid pressure sensor/switch "E" circuit range/performance). 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, internal mechanical wear (clutches, torque converter).
• P0989 — Transmission Fluid Pressure Sensor/Switch "E" Circuit Low (P0989): 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, wiring or connector faults in the valve body harness, valve body wear.
• P0990 — Transmission Fluid Pressure Sensor/Switch "E" Circuit High (P0990): 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, valve body wear, internal mechanical wear (clutches, torque converter).