AutoCodes – Hummer – U0140 Hummer

U0140 Hummer Code - Lost Communication With Body 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 Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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: U0140 Hummer indicates Lost Communication With Body Control Module.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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 4,623

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 Jun 29, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0140 Hummer 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 Body Control Module (BCM) has not been received.

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OBDII Code U0140 Hummer - Lost Communication With Body Control Module - AutoCodes.com — U0140 Hummer Code - Lost Communication With Body Control Module

What does this mean?

What are the Possible Causes of the DTC U0140 Hummer?

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

How to Fix the DTC U0140 Hummer?

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 does this mean?

Code Tech Notes

There is a factory service bulletin for the 2008-2009 HUMMER H2:
2008-2009 HUMMER H2 Factory Service Bulletin OBDII Code U0140

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0140 Hummer 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 U0140 Hummer code?

Need more information on how to fix the U0140 Hummer code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0140 Hummer code diagnosed by a professional: Find a repair shop in your area

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 U0140 Hummer Code

1. What are common symptoms of the U0140 OBDII code in a Hummer?

- Common symptoms include issues with interior lights, power windows, door locks, and other body control functions.

2. What does the U0140 code "Lost Communication With Body Control Module" mean?

- The code indicates a communication problem between the vehicle's control modules and the body control module.

3. What are some possible causes of the U0140 code in a Hummer?

- Possible causes include a faulty body control module, wiring issues, corrosion in connectors, or a software glitch.

4. How can I diagnose the U0140 code in my Hummer?

- Diagnosing the code typically involves using a professional OBDII scanner to read the trouble codes and performing a thorough inspection of the body control module and related wiring.

5. Can I still drive my Hummer with the U0140 code present?

- It is generally not recommended to drive the vehicle with the U0140 code active, as it can lead to further electrical issues and potential safety hazards.

6. How can I repair the U0140 code in my Hummer?

- Repairing the U0140 code may involve replacing the body control module, repairing any damaged wiring, cleaning connectors, and clearing the trouble codes with a scanner.

7. Is the U0140 code a serious issue in a Hummer?

- While the U0140 code may not cause immediate drivability issues, it can lead to malfunctions in critical body control functions, making it important to address promptly.

8. Can a DIY enthusiast fix the U0140 code in a Hummer?

- Depending on the skill level and access to tools, some DIY enthusiasts may be able to address the U0140 code by following repair guides and using the necessary diagnostic equipment.

9. How much does it cost to repair the U0140 code in a Hummer?

- The cost of repairing the U0140 code can vary depending on the extent of the issue, parts needed, and labor costs, ranging from a few hundred to over a thousand dollars.

10. Can the U0140 code return after it has been repaired in a Hummer?

- If the root cause of the communication issue is not properly addressed, the U0140 code may return, highlighting the importance of thorough diagnosis and repair.