P2139
Throttle/Pedal Position Sensor/Switch D/F Voltage Correlation
Channels D and F of the throttle/pedal position sensor disagree by more than the allowed tolerance.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Common causes
Ordered by how often each turns out to be the cause.
- One potentiometer track wornCommon
Parts involved
- Throttle Position Sensor
- Accelerator Pedal Position Sensor
P2139 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.