Powertrain, generic · Computer and auxiliary outputs

P06AA Control Module Internal Temperature B Too High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Transmission fluid too hot (cooler, lines, level)
Charging system overvoltage
Faulty internal sensor or module
High sustained load (towing, heat)

Symptoms

  • Transmission limp mode possible
  • Transmission warning
  • Often transmission overtemperature as well

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,000
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission control modulecontrol module internal temperature sensor

Related codes

P0634P06ABP06ACP06ADP06AEP0218

References: law.cornell.edu, saabwisonline.com, saabwisonline.com.