Powertrain, generic (extended)

P2D41 A/C Compressor Motor Voltage B Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2D41 is a plausibility check on the second voltage value that an electric A/C compressor reports for its motor drive: the reading is electrically valid but disagrees with a reference, for example the traction battery voltage or the first compressor voltage value. Which voltage the letter B stands for is up to the manufacturer; no manufacturer documents P2D41 on an official public source. GM shows the principle for voltage A in the Volt: P0D69 compares compressor input voltage with the pack voltage and fails above a 15 V gap (2011) or 30 V (2016), Type B. California only demands such monitoring where the compressor serves battery cooling or engine control. Low and high signal: P2D42, P2D43.

Likely causes

Faulty voltage measurement inside the compressor control module
Contact resistance at the high-voltage connector of the compressor
Implausible reference value from the battery or hybrid control module

Symptoms

  • Hybrid or EV warning message, warning lamp depending on the manufacturer
  • A/C cooling reduced or switched off

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–5 h

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

Parts involved

ac compressor motorac compressor modulewiring harness

Related codes

P2D42P2D43P2D44P0D69P0EA9

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