U0107Lost Communication With Throttle Actuator A 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
- U0107 targets a stand-alone throttle actuator control (TAC) module, as used before throttle control moved into the engine controller. In GM's 2004 and 2005 truck tables (4.3–6.0 L and 8.1 L) the PCM and TAC module traded data over a dedicated serial link; the PCM declared a gap after 18.75 ms and the TAC module after 25 ms. Each missing or corrupt message added 10 to a counter, each valid one took 1 away, and 500 ms without valid data produced a Type A code with MIL on the first trip. Without this link the electronic throttle is no longer cross-checked, so the engine usually runs with restricted power. U0408 covers invalid TAC data and U0308 a software mismatch.
- What you may notice
- MIL on
- Reduced engine power, throttle barely opens
- Idle unstable or engine stalls
- Likely causes
- LikelyOpen, shorted or chafed serial data lines between PCM and TAC module
- PossibleTAC module supply or ground faulty
- PossibleCorroded connector at the TAC module
- RareTAC module internally faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.