P0D76A/C Compressor Control Module Output Driver Temperature Sensor Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Check engine light after two trips
- Usually no noticeable change in A/C operation
- Likely causes
- LikelyDrifting IGBT temperature sensor in the compressor inverter
- PossibleOutside air or CPU temperature used for comparison is wrong
- RarePower stage still warm when the test ran
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.