P2D29 code meaning
A/C Compressor Motor Stalled
Powertrain system Generic code P2Dxx codes Check engine light
What P2D29 means
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.
P2D29 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2D29
- Air conditioning blows warm air
- Warning about reduced battery cooling or charging power
- Compressor phase current or overload codes stored alongside
Common causes of P2D29
- Most 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
- Less likelyHigh-voltage supply to the compressor interrupted or weak
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac compressor motor
What each part of P2D29 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 29 | The exact fault in that area. |
What to do next
- Note P2D29 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2D29
What does P2D29 mean?
P2D29 means "A/C Compressor Motor Stalled". Hybrids and electric vehicles drive the A/C compressor with its own high-voltage motor and inverter. It is a generic code, so it means the same on every make.
Is it safe to drive with P2D29?
Drive gently and only to a workshop. With P2D29 the car can go into limp mode (reduced power) to protect itself.
Will P2D29 fail an emissions test?
P2D29 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2D29 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P2D29 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.