U0164 on GMC
Lost Communication With HVAC Control Module
U0164 on GMC vehicles indicates lost communication with hvac control module. Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. This network code means another module on the vehicle's communication bus stopped receiving expected messages from the HVAC (climate control) module. Modern vehicles share data over networks like CAN, and when the HVAC module goes silent for too long, this code is set. It usually points to a power, ground, wiring, or bus fault rather than a climate-comfort issue itself. Climate controls may stop responding correctly, but it does not affect the vehicle's ability to drive. Typical repair costs on GMC range from $150 to $1,000, depending on the specific model and root cause.
Common Causes of U0164
- •Loss of power or ground to the HVAC module
- •Wiring or connector fault on the communication bus
- •Corroded or loose HVAC module connector
- •Faulty HVAC control module
- •Network/bus wiring damage or short affecting multiple modules
- •Gateway or related module fault disrupting the bus
U0164 on GMC by Model
GMC Sierra 3500HD(1 issue)
- Dashboard Instrument Cluster Pixel and Display Failure2015-2020
The instrument cluster in 2015-2020 Sierra 3500HD trucks suffers from LCD pixel failure, causing portions of the Driver Information Center (DIC) display to become unreadable. Individual pixels or entire segments go blank, making it impossible to read trip computer data, gear indicator, or warning messages. The issue is caused by solder joint failure on the cluster circuit board from thermal cycling and vibration. The speedometer and tachometer gauges may also develop stepper motor failures, causing inaccurate or stuck readings.
Looking for U0164 on a different make?
View U0164 across all makes →Frequently Asked Questions
What does U0164 mean on GMC?▼
U0164 stands for "Lost Communication With HVAC Control Module." This network code means another module on the vehicle's communication bus stopped receiving expected messages from the HVAC (climate control) module. Modern vehicles share data over networks like CAN, and when the HVAC module goes silent for too long, this code is set. It usually points to a power, ground, wiring, or bus fault rather than a climate-comfort issue itself. Climate controls may stop responding correctly, but it does not affect the vehicle's ability to drive. On GMC specifically, this code is documented across 1 model.
What causes U0164 on GMC vehicles?▼
Common causes on GMC: Loss of power or ground to the HVAC module, Wiring or connector fault on the communication bus, Corroded or loose HVAC module connector, Faulty HVAC control module, Network/bus wiring damage or short affecting multiple modules. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0164 on a GMC?▼
Repair costs on GMC range from $150 to $1,000, depending on the specific model and root cause.
Which GMC models have U0164 documented?▼
Au7o has documented U0164 on 1 GMC model: Sierra 3500HD.