Powertrain, generic · Computer and auxiliary outputs

P0667 Control Module Internal Temperature Sensor A Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Control modules measure their own circuit board temperature with an internal sensor to protect output stages (overtemperature is P0634) and, in GM transmission modules, as a substitute for fluid temperature. In GM's 6T70/6T75 and related automatics the sensor sits in the transmission module inside the valve body, with no external wiring – so the repair is practically always the module or valve body assembly. P0667 is the plausibility check: GM compares the module (substrate) temperature with the transmission fluid temperature and the temperature measured at power-up. The Saab 9-4X sets it when, within 5 of 6 minutes, fluid and substrate differ by more than 20–50 °C and power-up and substrate by more than 8–10 °C (two trips); GM's 2019 table uses 3000 of 3750 samples. The module then uses the power-up temperature instead. Check the fluid temperature sensor (P0711) first – it is the comparison partner.

Likely causes

Transmission module or valve body (internal sensor) faulty
Transmission fluid temperature sensor reads wrong (comparison partner)
Unusual conditions (long standing in extreme cold or heat, fluid level or condition)

Symptoms

  • Engine or transmission warning lamp
  • Harsher or delayed shifts (substitute temperature)
  • Possibly P0711 as well

Repair estimate

DifficultyHardWorkshop job
Parts and labour€400–1,500
Time2–5 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

P0666P0668P0669P0711P0634

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