P0D76 code meaning
A/C Compressor Control Module Output Driver Temperature Sensor Performance
Powertrain system Generic code P0Dxx codes Check engine light
What P0D76 means
P0D76 checks whether the compressor's output driver (IGBT) temperature sensor agrees with other temperatures after a cold soak. GM's 2011 Volt fails it when the IGBT reading differs from outside air by more than 11 °C and from the CPU sensor by more than 7 °C after the compressor has been off for over 21,600 s, with coolant and outside air within 15 °C of each other; 35 of 40 samples at 250 ms. The 2016 Volt uses 22 °C for both comparisons after 7,200 s off, the 2016 ELR 15 °C, and the 2019 Volt 22 °C in 8 of 10 s, where every comparison must fail together. Each is Type B, MIL after two trips. Causes: drifting sensor, wrong reference value, residual heat. Range codes are P0D77 and P0D78.
P0D76 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P0D76
- Check engine light after two trips
- Usually no noticeable change in A/C operation
Common causes of P0D76
- Most likelyDrifting IGBT temperature sensor in the compressor inverter
- PossibleOutside air or CPU temperature used for comparison is wrong
- Less likelyPower stage still warm when the test ran
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac compressor cm output driver temp sensorAc compressor module
What each part of P0D76 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 76 | The exact fault in that area. |
What to do next
- Note P0D76 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 P0D76
What does P0D76 mean?
P0D76 means "A/C Compressor Control Module Output Driver Temperature Sensor Performance". P0D76 checks whether the compressor's output driver (IGBT) temperature sensor agrees with other temperatures after a cold soak. It is a generic code, so it means the same on every make.
Is it safe to drive with P0D76?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0D76 fail an emissions test?
P0D76 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0D76 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P0D76 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.