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

• P2735 — OBD2 code P2735 flags a problem with the automatic transmission control (pressure control solenoid "F" intermittent). 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.
• P2736 — P2736 — Pressure Control Solenoid "F" 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).
• P2737 — Pressure Control Solenoid "F" Control Circuit Range/Performance (P2737): 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.
• P2738 — P2738 — Pressure Control Solenoid "F" Control Circuit Low. 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.
• P2739 — Pressure Control Solenoid "F" Control Circuit High (P2739): 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.
• P273A — Transmission Friction Element "G" Apply Time Range/Performance (P273A): 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, faulty transmission speed sensor.
• P273B — P273B — Transmission Friction Element "H" Apply Time Range/Performance. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: internal mechanical wear (clutches, torque converter), faulty transmission speed sensor, valve body wear.
• P2740 — Transmission Fluid Temperature Sensor "B" Circuit (P2740): 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.
• P2741 — OBD2 code P2741 flags a problem with the automatic transmission control (transmission fluid temperature sensor "B" circuit range/performance). 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, valve body wear.
• P2742 — P2742 — Transmission Fluid Temperature Sensor "B" Circuit Low. 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, internal mechanical wear (clutches, torque converter).
• P2743 — P2743 — Transmission Fluid Temperature Sensor "B" Circuit High. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: valve body wear, faulty transmission speed sensor, failed shift or pressure control solenoid.
• P2744 — OBD2 code P2744 flags a problem with the automatic transmission control (transmission fluid temperature sensor "B" circuit intermittent). Short, gentle driving to a shop is usually possible. Common culprits: failed shift or pressure control solenoid, low or degraded transmission fluid, faulty transmission speed sensor.
• P2745 — OBD2 code P2745 flags a problem with the sensor and actuator circuits (intermediate shaft speed sensor b circuit). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, blown fuse feeding the circuit, corroded, loose or damaged connector.
• P2746 — OBD2 code P2746 flags a problem with the sensor and actuator circuits (intermediate shaft speed sensor b circuit range/performance). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, poor ground connection, corroded, loose or damaged connector.
• P2747 — Intermediate Shaft Speed Sensor B Circuit No Signal (P2747): 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, faulty sensor or actuator of the affected circuit, blown fuse feeding the circuit.
• P2748 — Intermediate Shaft Speed Sensor B Circuit Intermittent (P2748): 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, open or shorted wiring in the circuit.
• P2749 — OBD2 code P2749 flags a problem with the sensor and actuator circuits (intermediate shaft speed sensor c 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.
• P2750 — P2750 — Intermediate Shaft Speed Sensor C 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, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.
• P2751 — OBD2 code P2751 flags a problem with the sensor and actuator circuits (intermediate shaft speed sensor c circuit no signal). The car is usually drivable while you plan the repair. Common culprits: faulty sensor or actuator of the affected circuit, poor ground connection, open or shorted wiring in the circuit.
• P2752 — P2752 — Intermediate Shaft Speed Sensor C 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, open or shorted wiring in the circuit.
• P2753 — OBD2 code P2753 flags a problem with the automatic transmission control (transmission fluid cooler control circuit/open). 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.
• P2754 — P2754 — Transmission Fluid Cooler 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), wiring or connector faults in the valve body harness, low or degraded transmission fluid.
• P2755 — P2755 — Transmission Fluid Cooler Control Circuit High. A fault in the automatic transmission control. Short, gentle driving to a shop is usually possible. Typical causes: low or degraded transmission fluid, failed shift or pressure control solenoid, internal mechanical wear (clutches, torque converter).
• P2756 — Torque Converter Clutch Pressure Control Solenoid (P2756): 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, faulty transmission speed sensor.