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.

P2757 — Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off (P2757): 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, low or degraded transmission fluid, valve body wear.
P2758 — Torque Converter Clutch Pressure Control Solenoid Control Circuit Stuck On (P2758): 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, internal mechanical wear (clutches, torque converter).
P2759 — OBD2 code P2759 flags a problem with the automatic transmission control (torque converter clutch pressure control solenoid control circuit electrical). Short, gentle driving to a shop is usually possible. Common culprits: low or degraded transmission fluid, valve body wear, failed shift or pressure control solenoid.
P2761 — Torque Converter Clutch Pressure Control Solenoid Control Circuit/Open (P2761): 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, internal mechanical wear (clutches, torque converter), faulty transmission speed sensor.
P2763 — OBD2 code P2763 flags a problem with the automatic transmission control (torque converter clutch pressure control solenoid control circuit high). 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.
P2764 — OBD2 code P2764 flags a problem with the automatic transmission control (torque converter clutch pressure control solenoid control circuit low). Short, gentle driving to a shop is usually possible. Common culprits: faulty transmission speed sensor, internal mechanical wear (clutches, torque converter), valve body wear.
P2765 — P2765 — Input/Turbine Speed Sensor "B" 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.
P2767 — Input/Turbine Speed Sensor "B" Circuit No Signal (P2767): 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, open or shorted wiring in the circuit.
P2768 — P2768 — Input/Turbine Speed Sensor "B" 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, control module driver fault, corroded, loose or damaged connector.
P2770 — P2770 — Torque Converter Clutch 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.
P2771 — P2771 — Four Wheel Drive (4WD) Low Switch Circuit. 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, open or shorted wiring in the circuit.
P2772 — Four Wheel Drive (4WD) Low Switch Circuit Range/Performance (P2772): 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, faulty sensor or actuator of the affected circuit.
P2773 — Four Wheel Drive (4WD) Low Switch Circuit Low (P2773): 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, corroded, loose or damaged connector, poor ground connection.
P2774 — OBD2 code P2774 flags a problem with the sensor and actuator circuits (four wheel drive (4WD) low switch circuit high). The car is usually drivable while you plan the repair. Common culprits: corroded, loose or damaged connector, poor ground connection, blown fuse feeding the circuit.
P2775 — Upshift Switch Circuit Range/Performance (P2775): 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, corroded, loose or damaged connector, blown fuse feeding the circuit.
P2776 — OBD2 code P2776 flags a problem with the sensor and actuator circuits (upshift switch circuit low). The car is usually drivable while you plan the repair. Common culprits: blown fuse feeding the circuit, poor ground connection, open or shorted wiring in the circuit.
P2777 — P2777 — Upshift Switch Circuit High. 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.
P2778 — P2778 — Upshift Switch Circuit Intermittent/Erratic. 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, poor ground connection, open or shorted wiring in the circuit.
P2780 — Downshift Switch Circuit Low (P2780): 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, poor ground connection, control module driver fault.
P2782 — P2782 — Downshift Switch Circuit Intermittent/Erratic. 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, poor ground connection, control module driver fault.
P2783 — Torque Converter Temperature Too High (P2783): 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, failed shift or pressure control solenoid, internal mechanical wear (clutches, torque converter).
P2785 — P2785 — Clutch Actuator Temperature Too High. 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, open or shorted wiring in the circuit, poor ground connection.
P2786 — OBD2 code P2786 flags a problem with the automatic transmission control (gear shift actuator temperature too 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, low or degraded transmission fluid.
P2787 — OBD2 code P2787 flags a problem with the sensor and actuator circuits (clutch temperature too high). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, open or shorted wiring in the circuit, faulty sensor or actuator of the affected circuit.