P0667 code meaning
Control Module Internal Temperature Sensor A Range/Performance
Powertrain system Generic code P06xx codes Check engine light
What P0667 means
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.
P0667 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor2 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0667
- Engine or transmission warning lamp
- Harsher or delayed shifts (substitute temperature)
- Possibly P0711 as well
Common causes of P0667
- Most likelyTransmission module or valve body (internal sensor) faulty
- PossibleTransmission fluid temperature sensor reads wrong (comparison partner)
- Less likelyUnusual conditions (long standing in extreme cold or heat, fluid level or condition)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Transmission control moduleControl module internal temperature sensor
What each part of P0667 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 67 | The exact fault in that area. |
What to do next
- Note P0667 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0667
What does P0667 mean?
P0667 means "Control Module Internal Temperature Sensor A Range/Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0667?
Drive gently and only to a workshop. With P0667 the car can go into limp mode (reduced power) to protect itself.
Will P0667 fail an emissions test?
Yes, it can. P0667 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0667 to fix?
Difficulty: hard. A typical repair takes 2 to 5 hours of work. This is a job for a workshop.
Will P0667 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.