Powertrain
generic / SAE
P2108
Throttle Actuator Control Module Performance
Self-tests within the TAC module fail their performance criteria — for example RAM/ROM checks or analog reference voltages drift. Indicates an aging ECU rather than a wiring fault.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 08
Possible causes
- ECU internal performance fault high
- ECU connector pins corroded low
- Module software outdated, reflash may resolve low
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2000 €
- Estimated time: 1–4 h
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012