Powertrain
generic / SAE
P2104
Throttle Actuator Control System — Forced Idle
The ECU has detected a fault severe enough that it forces the throttle actuator to the idle stop. The driver loses pedal authority — only idle is available until the underlying TAC fault clears.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 04
Possible causes
- Severe upstream TAC fault high
- Throttle position signal invalid medium
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: 120–900 €
- Estimated time: 1–4 h
- Component: throttle actuator control
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012