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Home/DTC Codes/Fiat/Cronos/2018-2025 1.3L I4 Flex Firefly/U0165
U0165

Lost Communication with Rear HVAC Control Module

2018-2025 Fiat Cronos 1.3L I4 Flex Firefly

Low SeverityNetworkGeneric (SAE)

Description

Cannot communicate with the rear climate control zone module.

Symptoms

  • Rear A/C not working
  • Rear climate controls unresponsive
  • No rear heat
  • Rear blower not running

Common Causes

  • Rear HVAC module failure
  • CAN bus wiring
  • Module power loss
  • Fuse blown
  • Rear blower motor issue

Diagnostic Steps

  1. Check rear HVAC module fuse
  2. Test power and ground
  3. Check CAN wiring
  4. Test rear blower motor
  5. Inspect rear climate control panel

Repair Notes

Check fuses for rear HVAC system. Rear module wiring runs through pillars.

Related Codes

U0164Lost Communication with HVAC Control Module

Other Network Codes

U0165 on Other Vehicles

Fiat 124 Spider

2017-2020 1.4L I4 Turbo

Fiat 126p Maluch

1973-2000 0.65L I2 Air-Cooled

Fiat 126p Maluch

1987-2000 0.7L I2 Air-Cooled

Fiat 500

2012-2019 1.4L I4

Fiat 500 Abarth

2012-2019 1.4L I4 Turbo

Fiat 500 BR

2011-2020 1.4L I4 Flex Fire Evo

Fiat 500 PL

2007-2025 1.0L I3 Hybrid FireFly 70

Fiat 500 PL

2007-2025 1.2L I4 Fire 69

Common Questions

What does code U0165 mean on a 2018-2025 Fiat Cronos?

U0165 stands for "Lost Communication with Rear HVAC Control Module". Cannot communicate with the rear climate control zone module.

What are the symptoms of U0165 on a Fiat Cronos?

Common symptoms of U0165 include: Rear A/C not working, Rear climate controls unresponsive, No rear heat, Rear blower not running.

What causes U0165 on a 2018-2025 Fiat Cronos?

Common causes of U0165 include: Rear HVAC module failure, CAN bus wiring, Module power loss, Fuse blown, Rear blower motor issue.

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