Powertrain, generic (extended)

P26FD A/C Compressor Internal Control Module Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

Electric A/C compressors in hybrids and electric vehicles carry their own inverter and control electronics. P26FD says this built-in module does not work as expected, as judged by the module that supervises the compressor. Audi documents the code for the 2016 A3 e-tron: the Climatronic unit J255 logs it instead of the engine module, and the MIL comes on purely as a network request. Bulletin 2047037/1 attributes it to a software error in the self-check of the refrigerant system and the compressor diagnosis; the cure is new Climatronic software, with the compressor replaced only if guided fault finding demands it. CARB requires monitoring of electronic A/C components whose failure affects emission control or other monitors. Cooling may still work or be limited.

Likely causes

Software error in the climate or compressor control
Internal electronics or inverter of the compressor failing
Fault in the high-voltage supply or fuse of the compressor

Symptoms

  • Check engine light on without a code in the engine module
  • Air conditioning weak or not cooling
  • Further A/C codes stored as sporadic

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time0.5–5 h

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

Parts involved

electric ac compressorcompressor inverter

Related codes

P0D71P0EAEP0EBF

References: static.nhtsa.gov, law.cornell.edu.