P06AAControl Module Internal Temperature B Too High
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- 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. P06AA would report an overtemperature measured by sensor B – the counterpart of P0634 for sensor A (GM: 142 °C, Saab 9-4X: 146 °C with a limp mode in reverse and 5th gear). No manufacturer document available to us uses P06AA itself; GM reports overtemperature via sensor A. Check transmission fluid temperature, cooler and charging voltage first.
- What you may notice
- Transmission limp mode possible
- Transmission warning
- Often transmission overtemperature as well
- Likely causes
- LikelyTransmission fluid too hot (cooler, lines, level)
- PossibleCharging system overvoltage
- PossibleFaulty internal sensor or module
- RareHigh sustained load (towing, heat)
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.