Throttle Actuator B Control System - Stuck Closed
Throttle B is mechanically stuck closed — carbon buildup or a seized bearing on the secondary throttle.
Affected components
- Throttle actuator b
Common causes
- High likelihood: Carbon buildup holds plate closed
- Low likelihood: Carbon or debris buildup preventing free movement
- Low likelihood: Component wear with age - mechanical play
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
- 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.