U0164
Lost Communication with HVAC Control Module
2016-2016 Cadillac ATS 2.5L I4
Low SeverityNetworkGeneric (SAE)
The 2016 Cadillac ATS is equipped with a 2.5L inline-4 engine. Below you'll find detailed u0164 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Cannot communicate with the climate control module.
Symptoms
- Climate control not working
- No A/C
- Fan not responding
Common Causes
- HVAC module failure
- Fuse
- CAN bus
- Wiring
Diagnostic Steps
- Check fuses
- Test power
- Check CAN wiring
Repair Notes
Check fuses and power supply.
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0164 on Other Vehicles
Common Questions
What does code U0164 mean on a 2016-2016 Cadillac ATS?
U0164 stands for "Lost Communication with HVAC Control Module". Cannot communicate with the climate control module.
What are the symptoms of U0164 on a Cadillac ATS?
Common symptoms of U0164 include: Climate control not working, No A/C, Fan not responding.
What causes U0164 on a 2016-2016 Cadillac ATS?
Common causes of U0164 include: HVAC module failure, Fuse, CAN bus, Wiring.
Last updated: March 2026