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U010F Lost Communication With Air Conditioning Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U010F is logged when the air conditioning control module stops reporting. J2012 keeps it apart from the HVAC control module (U0164): the A/C unit governs the refrigerant side, such as compressor clutch or electric compressor drive and pressures, while the HVAC module handles blower, flaps and temperature choice. Saab's 2011 code lists for the 9-5 and 9-4x carry U010F 00 next to U0164 00, which documents GM/Saab use. Neither list gives a threshold; Saab's general U0100–U02FF procedure applies, a missing state-of-health message at 9–16 V. The compressor then usually stays off, so cooling and demisting are lost; the engine is not affected and no MIL is expected. U040A covers invalid data from the same module.

Likely causes

A/C module without power or ground (fuse, connector)
Damaged bus lines to the A/C module
Condensate or water at module or connector
A/C module internally faulty

Symptoms

  • Air conditioning does not cool
  • Windows fog up, demisting weak
  • No MIL

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–800
Time0.5–3 h

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

Parts involved

hvac control modulecan bus wiring

Related codes

U0164U040A

References: saabwisonline.com, saabwisonline.com, saabwisonline.com, en.wikipedia.org.