U0164 on GMC: How to Diagnose & Fix
Lost Communication With HVAC Control Module
1 GMC model · 1 documented issue · $150-$1,000 repair
U0164 on GMC by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Missing pixels or blank segments on dashboard display
- DIC screen partially or fully blank
- Gear indicator not showing current gear
- Speedometer or tachometer reading incorrectly
- Gauges sticking or not returning to zero when off
- Intermittent display flickering
How to Fix
The cluster can be sent to a repair service specializing in GM instrument clusters ($150-$300) for re-soldering and stepper motor replacement — this fixes 90% of cases. A new OEM cluster from the dealer costs $500-$1,000 and requires VIN programming. Aftermarket rebuilt clusters are available for $200-$400. Some owners have successfully repaired the solder joints themselves with a soldering iron, but this requires electronics experience. The cluster must be programmed to the truck VIN after replacement.
Sources for this issue (1)
U0164 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U0164 mean on a 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 it is documented across 1 model: Sierra 3500HD.
What are the most common causes of U0164?
The most common causes of U0164 are: 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. The specific cause varies by vehicle.
How much does it cost to fix U0164 on a GMC?
Published repair estimates on GMC range from $150 to $1,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for U0164 on a different make?
View U0164 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.