U0164 on Chrysler: How to Diagnose & Fix
Lost Communication With HVAC Control Module
1 Chrysler model · 1 documented issue · $100-$800 repair
U0164 on Chrysler by model: symptoms, diagnosis and fix
The SAM module (Mercedes-sourced body control module) located in the trunk area suffers from water intrusion causing corrosion of circuits. This triggers random electrical faults including lighting, power window, and central locking failures.
Common Symptoms
- Random electrical faults
- Lights malfunction
- Central locking fails
- Multiple warning lights on dash
How to Fix
Remove SAM module, clean circuit board of corrosion, and reseal the module housing. Identify and seal the water intrusion point (often the trunk gasket or rear window seal). Severe corrosion requires SAM replacement and coding.
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 Chrysler?
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 Chrysler it is documented across 1 model: Crossfire.
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 Chrysler?
Published repair estimates on Chrysler range from $100 to $800 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.