OBD-II code · Powertrain (generic, extended)
P2120 Throttle/Pedal Position Sensor "C" Circuit
A general electrical fault on the "C" channel of the throttle or pedal position sensor. Drive-by-wire pedals carry two or three redundant tracks; "C" is the third channel.
Is it safe to drive with P2120?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPedal sensor track C failed
- PossibleSignal wire open
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Accelerator Pedal Sensor, Pedal Sensor Wiring
Related codes
- P211DThrottle Actuator B Control Throttle Body Range/Performance
- P211EThrottle Actuator B Control Module Processor
- P211FThrottle Actuator B Control Module Performance
- P2121Throttle/Pedal Position Sensor "C" Range/Performance
- P2122Throttle/Pedal Position Sensor "D" Circuit Low
- P2123Throttle/Pedal Position Sensor "D" Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.