U0324Software Incompatibility With HVAC Control Module
- Generic OBD-II code · Network
- How the car detects it
- The HVAC control module reads cabin and outside temperatures and drives blend doors, blower, defrosting and the request for the A/C compressor. U0324 means another controller has found its software or calibration unfit for the vehicle. No manufacturer documents U0324 publicly; GM bulletins show how tightly the HVAC calibration is tied to other parts. On 2018 Chevrolet Equinox and GMC Terrain the climate system stayed off during remote start below 6 °C because of a calibration issue in the HVAC module, cured by reprogramming (17-NA-388). On 2013–2016 Cadillac ATS automatic rear window and mirror defogging failed after a recall; Techline supplies HVAC software that matches a new radio antenna coil (16-NA-008). U0164 is lost contact, U0424 invalid data, U032A concerns the compressor module. Climate functions are limited, no MIL.
- What you may notice
- Heating, cooling or defrosting works only in part
- Climate settings reset or remote start climate stays off
- A/C compressor not requested
- Likely causes
- LikelyHVAC module calibration outdated or not matching the vehicle options
- PossibleConnected part replaced, such as antenna, display or compressor, without matching HVAC software
- PossibleHVAC module replaced or taken from another car without setup
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.