Powertrain, generic (extended)

P2D44 A/C Compressor Motor Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Internal mechanical wear or lack of oil in the compressor
Wrong refrigerant charge or excessive high-side pressure
Fault in the compressor inverter or its speed evaluation

Symptoms

  • A/C cools poorly or not at all
  • Unusual noise from the compressor
  • Battery cooling restricted on plug-in hybrids and EVs

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–3,500
Time2–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

ac compressor motorac compressor module

Related codes

P2D29P2D41P0EC5P0D6F

References: gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.