Powertrain, generic · Computer and auxiliary outputs
P06AB Control Module Internal Temperature Sensor B Circuit
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. P06AB is the general circuit fault of sensor B. No manufacturer table available to us uses P06AB itself – GM splits the faults into range (P06AC), low (P06AD) and high (P06AE). Expect a warning lamp and a substitute temperature with changed shifting.
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
References: law.cornell.edu, saabwisonline.com, gsi.ext.gm.com.