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U032A Software Incompatibility With A/C Compressor Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The A/C compressor control module drives an electric refrigerant compressor, as used in hybrid and electric cars, and reports speed and status to the climate controller. U032A means that controller considers the compressor module's software or learned data invalid. Volkswagen and Audi document the code: in the 2021 ID.4 a dead A/C with U032A00 first calls for checking a pending software campaign, not for a new compressor (tech tip 87-23-02TT). On 2022–2023 Audi Q4 e-tron the HVAC electronics J979 store U032A00 when the compressor module J842 has lost its adaptation; running the compressor calibration in the guided test restores cooling (2071838), and a later bulletin names the ME 3.5 update package as the production fix (2074321). U016B is lost contact, U046C invalid data, U0324 concerns the HVAC module. The cabin is not cooled.

Likely causes

Compressor module lost its adaptation and needs the calibration routine
Climate or compressor software below the level of an open update campaign
Electric compressor replaced without programming and calibration

Symptoms

  • Air conditioning blows warm, compressor does not run
  • Fault returns after a while even when cooling was restored
  • On electric cars battery cooling or preconditioning may be limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€0–400
Time0.3–1.5 h

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

Parts involved

ac compressor modulecontrol module software

Related codes

U016BU046CU0324

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.