P0D73A/C Compressor Control Module Internal Temperature Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0D73 is the low-signal circuit code for the internal (CPU) temperature sensor of the compressor control module. For an NTC sensor a low signal corresponds to an implausibly hot reading. GM sets it above 274 °C in the 2011–2015 Volt and 2016 ELR, and above 150 °C in the 2016–2019 Volt, where the compressor itself detects the condition and reports it over GMLAN; counting is 30 of 60 samples at 50 ms, 40 of 50 at 100 ms or 4 of 5 s depending on the year, Type B. Values like these suggest a shorted sensor rather than real heat, although genuine overheating of the electronics should be ruled out by checking. The compressor may limit or stop operation. The cold-side code is P0D72, plausibility P0D71.
- What you may notice
- Check engine light after two trips
- Air conditioning reduced or switched off
- Likely causes
- LikelyShort circuit in the internal temperature sensor path
- RareReal overheating of the compressor electronics
- RareFaulty value transmission to the host controller
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.