P2102
Throttle Actuator Control Motor Circuit Low
Drive voltage to the throttle motor is below the lower limit. Typically a short to ground or a failed driver stage in the ECU.
- 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.
- Drive line shorted to groundCommon
- Throttle motor internal shortPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Throttle Actuator Motor
- Throttle Body Wiring
- ECM
P2102 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.