Powertrain
generic / SAE
P2C9A
Throttle Actuator B Control Exceeded Learning Limit
The required adaptation offset for throttle actuator B exceeds the calibrated learning window. Mechanical wear, deposit build-up, or sensor drift beyond compensation.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberC / 9A
Possible causes
- Deposits on throttle plate or bore high
- TPS reference drifted medium
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 50–400 €
- Estimated time: 0.5–2 h
- Component: throttle actuator b
- Component: throttle position sensor
- Component: ecm
- MIL / check engine light
- emissions-relevant
- limp mode possible
Sources
References
sae:J2012