Powertrain, generic (extended)

P2D29 A/C Compressor Motor Stalled

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Hybrids and electric vehicles drive the A/C compressor with its own high-voltage motor and inverter. P2D29 reports that this motor is commanded to turn but does not rotate. No manufacturer documents P2D29 publicly. GM's 2019 hybrid tables cover a related check under its own code P1F0A: the filtered gap between commanded and fed-back compressor speed must stay inside limits while 960 to 8,600 rpm is requested, high-side pressure is below 2,800 kPa and pack voltage above 270 V; failure is Type B. A Tecumseh patent explains why current alone misses a stall and why high head pressure right after shutdown can hold the rotor. Without the compressor, cabin and often battery cooling are lost.

Likely causes

Mechanically seized compressor, often after oil loss or refrigerant leak
Fault in the compressor's integrated inverter or phase output
Restart against high head pressure or overcharged system
High-voltage supply to the compressor interrupted or weak

Symptoms

  • Air conditioning blows warm air
  • Warning about reduced battery cooling or charging power
  • Compressor phase current or overload codes stored alongside

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–3,500
Time1–6 h

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

Parts involved

ac compressor motor

Related codes

P2D44P0EC5P0D6FP0D7AU016BP26FD

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