OBD-II diagnostic trouble code
U0164Safe to drive

Lost Communication with HVAC Control Module

The network has lost contact with the climate control module, typically affecting only heating/cooling functions.

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Code names are compiled from open/standardized SAE and ISO references. Explanations, symptoms, causes and fixes are original. Covers generic (P0/C0/B0/U0) codes only — manufacturer-specific codes are planned for a future update.

Frequently asked questions

Can I drive with U0164?

In most cases, yes — U0164 is generally not an urgent safety issue and the car is usually safe to drive for a while. Still, get it checked soon, since the underlying cause can affect fuel economy or emissions the longer it's left.

How much does it cost to fix U0164?

The cost varies too much by cause and vehicle to give a single figure here — a diagnosis will narrow it down.

What causes U0164?

AS
Reviewed by Artyom SemenovAutomotive Editor · Fact-checked by Yauheni Kapliarchuk, Editor-in-Chief
Code names compiled from open SAE/ISO references; explanations and repair guidance are original editorial content
Last verified: 09 Jul 2026 · Our methodology