Powertrain, generic · Computer and auxiliary outputs
P06AD Control Module Internal Temperature Sensor B Circuit Low
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. P06AD means the sensor B signal is at its low end: GM converts it and treats −59 °C or less for 60 s as a fault, lamp after two trips. Unlike most temperature sensors, low here corresponds to an implausibly cold reading. 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
References: law.cornell.edu, gsi.ext.gm.com, saabwisonline.com.