OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P2104?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySevere upstream TAC fault
- PossibleThrottle position signal invalid
Symptoms
- Check engine light on
- Reduced throttle response, possible limp mode
- Hesitation or surging
- Idle too high or too low
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Throttle Actuator Control, Ecm
Related codes
- P2100Throttle Actuator Control Motor Circuit Open
- P2101Throttle Actuator Control Motor Circuit Range/Performance
- P2102Throttle Actuator Control Motor Circuit Low
- P2103Throttle Actuator Control Motor Circuit High
- P2105Throttle Actuator Control System — Forced Engine Shutdown
- P2106Throttle Actuator Control System — Forced Limited Power
- P2107Throttle Actuator Control Module Internal Processor
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.