Throttle Actuator Control System — Stuck Closed
The throttle plate cannot be commanded open. The engine stays at idle or stalls under load. Often caused by a seized motor, broken gear, or heavy carbon coking inside the throttle bore.
Affected components
- Throttle body
- Throttle actuator motor
Common causes
- High likelihood: Throttle plate seized closed
- Medium likelihood: Throttle motor seized or gear broken
- Low likelihood: Carbon or debris buildup preventing free movement
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.