AutoCodes – Buick – U1064 Buick

U1064 Buick 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 Buick 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 3,283

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

What does this mean?

What are the Possible Causes of the DTC U1064 Buick?

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 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 U1064 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 U1064 Buick Code

1. What does OBDII code U1064 mean on a Buick?

Code U1064 indicates a loss of communication with the Body Control Module (BCM), which is responsible for managing various electrical systems in the vehicle.

2. What are the common symptoms of code U1064 on a Buick?

Common symptoms include malfunctioning interior lights, power door locks, intermittent electrical issues, or warning lights on the dashboard.

3. What causes the U1064 code to appear on a Buick?

The code can be caused by a faulty BCM, damaged wiring or connectors, a poor ground connection, or issues with the CAN (Controller Area Network) bus communication system.

4. Can a weak battery trigger the U1064 code on a Buick?

Yes, a weak or failing battery can cause communication errors, including the U1064 code, due to insufficient power supply to the BCM.

5. How is the U1064 code diagnosed on a Buick?

A technician will use a scan tool to check for related codes, inspect the wiring and connectors for damage, and test the functionality of the BCM and the CAN bus system.

6. Can I drive my Buick with the U1064 code present?

While the vehicle may still be drivable, electrical issues related to the BCM could worsen over time, potentially leading to safety concerns or additional system failures.

7. How can I fix the U1064 code on my Buick?

Repairs may include replacing damaged wiring, cleaning or securing loose connectors, updating BCM software, or replacing the BCM if itâ€™s defective.

8. Is a BCM replacement expensive for a Buick?

Replacing the BCM can be costly, with parts and labor typically ranging from $300 to $800, depending on the model and location.

9. Can resetting the system clear the U1064 code?

In some cases, disconnecting and reconnecting the battery or clearing the code with a scan tool may temporarily resolve the issue, but further diagnosis is needed to ensure the problem doesn't return.

10. What should I check first if I get the U1064 code on my Buick?

Start by inspecting the battery voltage, checking for loose or corroded connectors near the BCM, and examining the wiring for visible damage.