Throttle Actuator B Control System - Stuck Open
Throttle B is mechanically stuck open — typically carbon buildup or a broken return spring on the secondary throttle plate.
Affected components
- Throttle actuator b
Common causes
- High likelihood: Carbon buildup holds plate open
- Medium likelihood: Return spring 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
- Reduced-power or limp mode may occur
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.