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.
Affected components
- Throttle actuator control
- Ecm
Common causes
- High likelihood: Underlying TAC fault triggers limit
- Medium likelihood: Pedal position sensor signal implausible
Possible symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.