AutoCodes – GMC – U0164 GMC

U0164 GMC Code - Lost Communication With HVAC Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module, HVAC Control Module harness is open or shorted, HVAC Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U0164 GMC indicates Lost Communication With HVAC Control Module.
Common causes: Common causes include Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module, HVAC Control Module harness is open or shorted, HVAC Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,648

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0164 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Heating, Ventilation, and Air Conditioning (HVAC) Control Module has not been received.

OBDII Code U0164 GMC - Lost Communication With HVAC Control Module - AutoCodes.com — U0164 GMC Code - Lost Communication With HVAC Control Module

What does this mean?

What are the Possible Causes of the DTC U0164 GMC?

Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module
HVAC Control Module harness is open or shorted
HVAC Control Module circuit poor electrical connection

How to Fix the DTC U0164 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0164 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U0164 GMC code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0164 GMC Code

1. What are common symptoms of the OBDII code U0164 GMC related to Lost Communication With HVAC Control Module?

- Common symptoms include the HVAC system not responding, incorrect temperature control, and issues with the air conditioning or heating.

2. What are possible causes of the U0164 code indicating Lost Communication With HVAC Control Module?

- Possible causes include a faulty HVAC control module, damaged wiring or connectors, software glitches, or a malfunctioning body control module.

3. How can I diagnose the U0164 code in my GMC vehicle?

- Diagnose the U0164 code by checking the HVAC control module connections, inspecting wiring for damage, scanning for additional trouble codes, and using a diagnostic tool to communicate with the module.

4. Is it safe to continue driving with the U0164 trouble code present?

- It is generally safe to drive with the U0164 code, but it's recommended to address the issue promptly to ensure proper functioning of the HVAC system.

5. Can I repair the U0164 code issue on my own, or do I need professional help?

- While some simple checks like inspecting connections can be done at home, diagnosing and repairing the U0164 code may require professional help due to the complexity of the HVAC control module system.

6. Are there any quick fixes for the U0164 code before taking the vehicle to a mechanic?

- Quick fixes may include checking and reseating the HVAC control module connectors, resetting the system by disconnecting the battery, or ensuring the HVAC system fuses are intact.

7. How much can I expect to pay to repair the U0164 code related to Lost Communication With HVAC Control Module?

- Repair costs for the U0164 code can vary depending on the exact cause of the issue, but expect to pay anywhere from $100 to $500 for parts and labor.

8. Will resetting the U0164 trouble code make it go away permanently?

- Resetting the U0164 code may temporarily clear the fault, but if the underlying issue causing the lost communication with the HVAC control module persists, the code is likely to return.

9. Can extreme weather conditions contribute to triggering the U0164 code in a GMC vehicle?

- Extreme temperature changes or exposure to moisture can potentially impact the HVAC control module and contribute to triggering the U0164 code in some cases.

10. Is the U0164 code specific to GMC vehicles, or can it occur in other car brands as well?

- The U0164 code indicating Lost Communication With HVAC Control Module is not specific to GMC vehicles and can occur in other car brands equipped with OBDII systems.