P2D43A/C Compressor Motor Voltage B High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- With P2D43 the controller reports that compressor motor voltage B has climbed above the level its power stage can withstand; the compressor controller normally stops the motor to protect its transistors. No manufacturer documents P2D43 on an official public source. GM's hybrid tables show how the voltage A side is treated: the 2011 Volt logs a single sample of 480 V or more as P1ECA, while the 2016 tables classify a reading above 527.25 V as out of range under P0D6A, each Type B. Real overvoltage is rare because the battery holds the bus steady; spikes during charging or regeneration, a faulty converter or charger, or a wrong measurement inside the compressor are more likely. The A/C cuts out; repeated cases call for a check of the high-voltage system.
- What you may notice
- A/C switches off, sometimes only for a while
- Hybrid or EV system warning
- Likely causes
- LikelyFaulty voltage measurement in the compressor control module
- PossibleVoltage spikes on the high-voltage bus during charging or regeneration
- RareFaulty DC/DC converter or on-board charger
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.