OBD-II code · Powertrain (generic, extended)
P2105 Throttle Actuator Control System — Forced Engine Shutdown
The TAC monitor commanded an engine shutdown because throttle authority can no longer be guaranteed safely. The most aggressive TAC limp mode — used when both throttle position sensors disagree or the motor is uncontrollable.
Is it safe to drive with P2105?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyTPS1 and TPS2 disagree beyond limit
- PossibleThrottle motor not controllable
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
- 1–5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Throttle Actuator Control, Throttle Position Sensor, Ecm
Related codes
- P2104Throttle Actuator Control System — Forced Idle
- P2102Throttle Actuator Control Motor Circuit Low
- P2103Throttle Actuator Control Motor Circuit High
- P2106Throttle Actuator Control System — Forced Limited Power
- P2107Throttle Actuator Control Module Internal Processor
- P2108Throttle Actuator Control Module Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.