AutoCodes – Chevrolet – U1040 Chevrolet

U1040 Chevrolet Code - Lost Communication With Electronic Brake 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 Electronic Brake Control Module, Electronic Brake Control Module harness is open or shorted, Electronic Brake 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: U1040 Chevrolet indicates Lost Communication With Electronic Brake Control Module.
Common causes: Common causes include Faulty Electronic Brake Control Module, Electronic Brake Control Module harness is open or shorted, Electronic Brake 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 24,893

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1040 Chevrolet 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) U1040 is set.

OBDII Code U1040 Chevrolet - Lost Communication With Electronic Brake Control Module - AutoCodes.com — U1040 Chevrolet Code - Lost Communication With Electronic Brake Control Module

What does this mean?

What are the Possible Causes of the DTC U1040 Chevrolet?

Faulty Electronic Brake Control Module
Electronic Brake Control Module harness is open or shorted
Electronic Brake Control Module circuit poor electrical connection

How to Fix the DTC U1040 Chevrolet?

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 U1040 Chevrolet 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 U1040 Chevrolet Code

1. What are common symptoms of the OBDII code U1040 in a Chevrolet related to lost communication with the Electronic Brake Control Module (EBCM)?

- Common symptoms include loss of ABS functionality, traction control issues, and illuminated warning lights on the dashboard.

2. What are some possible causes of the U1040 code in a Chevrolet indicating a communication problem with the EBCM?

- Possible causes may include a faulty EBCM, damaged wiring or connectors, a blown fuse, or a communication network issue.

3. How can I diagnose the U1040 code in my Chevrolet to pinpoint the source of the communication problem with the EBCM?

- Diagnose the U1040 code by checking for other related trouble codes, inspecting the wiring and connectors for damage, testing the EBCM for proper functionality, and verifying the communication network integrity.

4. Can a DIY enthusiast repair the U1040 code related to lost communication with the EBCM in a Chevrolet?

- Depending on the root cause, DIY repair options may include checking and repairing wiring connections, replacing a blown fuse, or resetting the communication network. Complex issues may require professional diagnosis and repair.

5. Is it safe to continue driving my Chevrolet with the U1040 OBDII code indicating a communication problem with the EBCM?

- It is not recommended to drive the vehicle with the U1040 code present, as it may affect the ABS and traction control systems, compromising safety. It is advisable to address the issue promptly.

6. How can I prevent the U1040 code from recurring in my Chevrolet after repairing the communication problem with the EBCM?

- To prevent the U1040 code from recurring, ensure proper installation of any repaired or replaced components, regularly inspect the wiring and connectors for damage, and address any underlying issues promptly.

7. Will resetting the U1040 code in my Chevrolet clear the communication problem with the EBCM?

- Resetting the U1040 code may temporarily clear the warning lights, but it will not fix the underlying communication issue with the EBCM. Proper diagnosis and repair are necessary to address the root cause.

8. What steps should I take if the U1040 code persists in my Chevrolet even after repairing the communication problem with the EBCM?

- If the U1040 code persists after repair, recheck the connections and wiring, ensure proper installation of components, and consider seeking professional help for further diagnosis and repair.

9. Can a weak battery or alternator cause the U1040 code related to lost communication with the EBCM in a Chevrolet?

- A weak battery or alternator may contribute to communication issues, leading to the U1040 code in a Chevrolet. Ensure the electrical system is in good condition to prevent such problems.

10. How long does it typically take to repair the U1040 code indicating a communication problem with the EBCM in a Chevrolet?

- The repair time for the U1040 code can vary based on the root cause. Simple fixes like checking connections may take a short time, while more complex issues may require several hours or professional assistance.