P06ACControl Module Internal Temperature Sensor B Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Control modules can carry a second internal temperature sensor (B). In GM's 6T70/6T75 and related automatics, sensor A measures the circuit board (substrate) temperature, sensor B the 'power-up temperature' used as a reference and substitute; both sit inside the transmission module in the valve body, so repairs mean module or valve body. P06AC is the plausibility check of sensor B: GM compares the power-up temperature with the substrate temperature (sensor A) and the transmission fluid temperature and sets the code after two trips if they disagree beyond tabulated limits. Check the fluid temperature sensor (P0711) as comparison partner first.
- What you may notice
- Warning or check engine light
- Changed shift quality (substitute value)
- Implausible module temperature in the scan tool
- Likely causes
- LikelyTransmission module or valve body (internal sensor) faulty
- PossibleTransmission fluid temperature sensor reads wrong
- RareModule supply or software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €300 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.