P0120 Throttle/Pedal Position Sensor/Switch "A" Circuit
Electrical fault in the throttle position sensor A circuit.
Common causes
- Faulty throttle body sensor
- Wiring or connector damage
- Water in connector
Symptoms
- Check engine light
- Limp mode with limited throttle
- Erratic idle
What to check
- Inspect the throttle body connector
- Check reference voltage and ground
- Review both TPS signals with a scan tool
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0120, follow the service information for that make and model.
Related codes
- P0121 Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance
- P0122 Throttle/Pedal Position Sensor/Switch "A" Circuit Low
- P0123 Throttle/Pedal Position Sensor/Switch "A" Circuit High
- P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
- P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)