P2D44A/C Compressor Motor 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
- P2D44 is the overall function check of the electric A/C compressor motor: it is commanded to run but does not deliver what is expected, typically a speed feedback that does not follow the request, while no single voltage or current fault is flagged. No manufacturer documents P2D44 on an official public source. GM runs the comparable test under its own code P1F0A, Type B: the 2011 Volt fails it when the spinning motor stays below 1800 rpm for 20 s; the 2019 tables filter the gap between requested and reported speed across a request range of 960 to 8,600 rpm. A rotor that does not turn at all has its own code, P2D29. Causes include internal wear, too little refrigerant or oil, excessive head pressure and controller faults. Cooling becomes weak or stops.
- What you may notice
- A/C cools poorly or not at all
- Unusual noise from the compressor
- Battery cooling restricted on plug-in hybrids and EVs
- Likely causes
- LikelyInternal mechanical wear or lack of oil in the compressor
- PossibleWrong refrigerant charge or excessive high-side pressure
- PossibleFault in the compressor inverter or its speed evaluation
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.