AutoCodes – GMC – U1064 GMC

U1064 GMC Code - Lost Communications With Body Control Module

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted, Body Control Module (BCM) 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: U1064 GMC indicates Lost Communications With Body Control Module.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted, Body Control Module (BCM) 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 2,573

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 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1064 GMC Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1064 is set.

OBDII Code U1064 GMC - Lost Communications With Body Control Module - AutoCodes.com — U1064 GMC Code - Lost Communications With Body Control Module

What does this mean?

What are the Possible Causes of the DTC U1064 GMC?

Faulty Body Control Module (BCM)
Body Control Module (BCM) harness is open or shorted
Body Control Module (BCM) circuit poor electrical connection

How to Fix the DTC U1064 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 U1064 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.

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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 U1064 GMC Code

1. What are the common symptoms of OBDII code U1064 GMC?

The common symptoms of code U1064 GMC include issues with power windows, door locks, interior lights, and other body control module functions not working properly.

2. What are the possible causes of the U1064 GMC code?

The U1064 GMC code is often caused by a poor electrical connection, a faulty body control module, wiring issues, or a communication error between modules in the vehicle.

3. How can I diagnose the U1064 GMC code?

Diagnosing the U1064 GMC code typically involves using a scan tool to retrieve the code, checking for any other related codes, inspecting the wiring and connections to the body control module, and testing the module itself.

4. Can a bad battery cause the U1064 GMC code to appear?

Yes, a weak or faulty battery can sometimes trigger the U1064 GMC code due to voltage fluctuations affecting communication between modules in the vehicle.

5. What are some repair tips for fixing the U1064 GMC code?

Repair tips for the U1064 GMC code include checking and repairing any damaged wiring, ensuring proper connections to the body control module, testing and potentially replacing the body control module, and resetting the code after repairs are completed.

6. Is it safe to continue driving with the U1064 GMC code present?

It is generally not recommended to continue driving with the U1064 GMC code active, as it may lead to further electrical issues within the vehicle and could potentially impact its overall performance and safety.

7. Can a DIY enthusiast fix the U1064 GMC code at home?

While some aspects of diagnosing and repairing the U1064 GMC code can be done by a knowledgeable DIY enthusiast with the right tools and resources, it is often best to consult a professional mechanic for accurate diagnosis and proper repairs.

8. How much does it typically cost to repair the U1064 GMC code?

The cost of repairing the U1064 GMC code can vary depending on the underlying cause of the issue, the extent of the repairs needed, and labor costs. It is advisable to obtain quotes from different mechanics or repair shops for an accurate estimate.

9. Will resetting the U1064 GMC code make it go away permanently?

Resetting the U1064 GMC code may temporarily clear the code, but if the underlying issue causing the code is not addressed and repaired, it is likely to reappear. It is important to diagnose and fix the root cause of the problem.

10. Can extreme weather conditions trigger the U1064 GMC code?

Extreme weather conditions, such as extreme cold or heat, can sometimes affect the electrical systems in a vehicle and potentially trigger the U1064 GMC code due to disruptions in communication between modules.