AutoCodes – Buick – U0164 Buick

U0164 Buick 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 Buick 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 2,696

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

What does this mean?

What are the Possible Causes of the DTC U0164 Buick?

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 Buick?

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 Buick 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.

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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 Buick Code

1. What are the common symptoms of OBDII code U0164 (Lost Communication With HVAC Control Module) in a Buick?

- Common symptoms include issues with the heating, ventilation, and air conditioning system, such as the HVAC controls not responding or the system not functioning properly.

2. What are some possible causes of OBDII code U0164 in a Buick?

- Causes of this code can include a faulty HVAC control module, damaged wiring or connectors, software issues, or a communication bus problem.

3. How can I diagnose the cause of OBDII code U0164 in my Buick?

- To diagnose this code, you may need to perform a thorough inspection of the HVAC control module, check for any visible wiring issues, and use a diagnostic scan tool to communicate with the module and determine the root cause.

4. Can I drive my Buick with the U0164 code present?

- It is generally not recommended to drive your Buick with the U0164 code active, as it can lead to potential issues with the HVAC system, affecting your comfort and safety while driving.

5. How can I repair OBDII code U0164 in my Buick?

- Repairing this code may involve replacing the HVAC control module, repairing any damaged wiring or connectors, updating software if necessary, or addressing any communication bus problems.

6. Are there any DIY tips for troubleshooting OBDII code U0164 in a Buick?

- Some DIY tips include checking the fuse related to the HVAC system, ensuring all connections are secure, and performing a visual inspection of the wiring harness for any signs of damage.

7. How much does it typically cost to repair OBDII code U0164 in a Buick?

- The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from a few hundred dollars for simple fixes to over a thousand dollars for more complex repairs.

8. Can a mechanic reset the U0164 code in my Buick without fixing the underlying issue?

- While a mechanic can clear the code, it is important to address the root cause of the problem to prevent the code from reoccurring and ensure the proper functioning of the HVAC system.

9. Will OBDII code U0164 cause my Buick to fail an emissions test?

- Depending on the regulations in your area, a U0164 code related to the HVAC system may not directly impact emissions, but it is still recommended to address and repair the issue for overall vehicle performance.

10. How long does it take to repair OBDII code U0164 in a Buick?

- The repair time for this code can vary based on the specific cause and complexity of the issue. It may take a few hours to a full day for diagnosis and repair by a professional mechanic.