U0308Software Incompatibility With Throttle Actuator Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- U0308 flags that the throttle actuator control module carries software or a calibration that the engine controller does not accept. In most current cars throttle control lives inside the ECM/PCM, so a separate TAC module and this code are rare; no manufacturer documents U0308 publicly. Ford shows how such a mismatch is handled when the logic is integrated: its 2012 OBD summary files a software version mismatch between the electronic-throttle processors under U0300, non-MIL on Gen2 and MIL on Gen3/Gen4 throttle systems. GM's U03xx procedure links these codes to a module that was not configured after installation. Throttle control affects emissions, so CARB demands monitoring and a MIL is likely. U0107 means lost contact, U0408 invalid data.
- What you may notice
- Check engine light on
- Reduced power or limp mode with limited throttle opening
- Code appears after module replacement or programming
- Likely causes
- LikelyThrottle or engine control module replaced or flashed without matching software
- PossibleWrong or outdated calibration loaded, e.g. by an engine tune
- RareProgramming aborted due to low voltage
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.