Powertrain
generic / SAE
P211A
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 1A
Possible causes
- Carbon buildup holds plate open high
- Return spring broken medium
- Carbon or debris buildup preventing free movement low
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–700 €
- Estimated time: 0.5–3 h
- Component: throttle actuator b
- MIL / check engine light
- emissions-relevant
- limp mode possible
Sources
References
sae:J2012