OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P2108?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyECU internal performance fault
- Less likelyECU connector pins corroded
- Less likelyModule software outdated, reflash may resolve
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
- Ecm
Related codes
- P2107Throttle Actuator Control Module Internal Processor
- P2105Throttle Actuator Control System — Forced Engine Shutdown
- P2106Throttle Actuator Control System — Forced Limited Power
- P2109Throttle/Pedal Position Sensor A Minimum Stop Performance
- P210AThrottle Actuator B Control Motor Circuit/Open
- P210BThrottle Actuator B Control Motor Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.