P2106
Throttle Actuator Control System — Forced Limited Power
The TAC monitor restricts maximum throttle opening as a safety response to a TAC fault. The vehicle can still be driven, but accelerator pedal travel is capped.
- 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 limitCommon
- Pedal position sensor signal implausiblePossible
Parts involved
- Throttle Actuator Control
- ECM
P2106 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.