Powertrain, generic · Computer and auxiliary outputs

P06AE Control Module Internal Temperature Sensor B Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
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. P06AE means the sensor B signal is at its high end: GM treats 164 °C or more for 60 s as a fault, lamp after two trips. This is an implausible value, not a real overtemperature – GM reports that via sensor A (P0634) from 142 °C. The module then uses a substitute value.

Likely causes

Transmission module or valve body (internal sensor) faulty
Moisture or fluid in the module electronics
Module supply or software

Symptoms

  • Warning or check engine light
  • Changed shift quality (substitute value)
  • Implausible module temperature in the scan tool

Repair estimate

DifficultyHardWorkshop job
Parts and labour€300–1,500
Time1–4 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

P06ADP06ACP06ABP06AAP0669

References: law.cornell.edu, gsi.ext.gm.com, saabwisonline.com.