Powertrain, generic · Computer and auxiliary outputs

P06AC Control Module Internal Temperature Sensor B Range/Performance

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. 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.

Likely causes

Transmission module or valve body (internal sensor) faulty
Transmission fluid temperature sensor reads wrong
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

P06ADP06AEP06ABP0667P0711

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