What does fault code U0164 mean?

Lost Communication with HVAC Control Module. Loss of comms with the climate control module.

U0164

Lost Communication with HVAC Control Module

Q: What are the symptoms of U0164?

Climate control inoperative or stuck; Possible CEL

Q: What are the possible causes of U0164?

Blown fuse; Wiring fault; Failed HVAC control module

Q: How to fix U0164?

Check fuse and wiring; Replace module if confirmed

Severity: Low Network/Communication Generic OBD-II Code Est. Repair: $50 - $500

Usually safe to drive short-term, but diagnose soon.

Quick Answer

U0164 means “Lost Communication with HVAC Control Module.” Severity: Low. Estimated repair cost: $50 - $500. Most common sign: Climate control inoperative or stuck.

What Does U0164 Mean?

Loss of comms with the climate control module.

Common Symptoms

Climate control inoperative or stuck

Possible CEL

Possible Causes

Blown fuse

Wiring fault

Failed HVAC control module

How to Fix U0164 – Repair Guide

Check fuse and wiring

Replace module if confirmed

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Budgeting for This Repair?

A typical U0164 repair runs about $50 - $500. If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.