U0164 on 2004-2008 Chrysler Crossfire — Lost Communication With HVAC Control Module
1 vehicles · 1 makes · $100-$800 repair
How to diagnose and fix U0164: most-reported vehicles
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Chrysler Crossfire · 2004–2008
The security (alarm) module and central locking pump located in the trunk area suffer 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 the security module and central locking pump, clean circuit boards of corrosion, and reseal the housings. Identify and seal the water intrusion point (often the fuel-door drain hose, fuel-filler gasket, tail-light seals, trunk gasket or rear window seal). Severe corrosion requires module replacement.
Sources for this issue (4)
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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?
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.
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?
Repair costs for U0164 range from $100 to $800, depending on the vehicle and root cause.
Which vehicles are affected by U0164?
Au7o has documented U0164 across 1 vehicle models from 1 manufacturers: Chrysler.
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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.