P2110
Throttle Actuator Control System — Forced Limited RPM
The TAC monitor caps engine speed at a fixed limp-home rpm because it can no longer trust the throttle response. Driver may notice a hard rev limit well below redline.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
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.
- Underlying TAC fault triggers rpm capCommon
- Throttle response time out of specPossible
Parts involved
- Throttle Actuator Control
- ECM
P2110 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.