P2D29A/C Compressor Motor Stalled
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Air conditioning blows warm air
- Warning about reduced battery cooling or charging power
- Compressor phase current or overload codes stored alongside
- Likely causes
- LikelyMechanically seized compressor, often after oil loss or refrigerant leak
- PossibleFault in the compressor's integrated inverter or phase output
- PossibleRestart against high head pressure or overcharged system
- RareHigh-voltage supply to the compressor interrupted or weak
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €200 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.