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2014 AUDI R8
5.2L V10•AWD•DCT•gas•CTPA
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Repairs0Labor492Torque2167Fluid9DTC1129Battery1Maintenance0Recalls0
U0166low severityNetwork

Lost Communication with Auxiliary HVAC Control Module

on 2014 Audi R8 5.2L V10 · AWD

What this code means

Cannot communicate with auxiliary heater or auxiliary climate module.

Symptoms

  • Auxiliary heater not working
  • Pre-conditioning not available
  • Remote start climate control disabled

Common causes

  • Auxiliary HVAC module failure
  • CAN bus wiring
  • Module power loss
  • Fuse blown

Diagnostic steps

  1. Check auxiliary HVAC fuse
  2. Test power and ground
  3. Check CAN wiring
  4. Test auxiliary heater element

Repair notes

Check fuses for auxiliary climate system.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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