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U0140 Hummer Code - Lost Communication With Body Control Module

Quick Answer

The U0140 diagnostic trouble code (DTC) for Hummer vehicles indicates that there is a communication problem between the vehicle's Engine Control Module (ECM) and the Body Control Module (BCM). Common causes include Faulty wiring or connectors between the ECM and BCM, Corrosion or damage to the communication lines, Software glitches or programming errors in the ECM or BCM. 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 wiring or connectors between the ECM and BCM, Corrosion or damage to the communication lines, Software glitches or programming errors in the ECM or BCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code U0140 Hummer Description

The U0140 diagnostic trouble code (DTC) for Hummer vehicles indicates that there is a communication problem between the vehicle's Engine Control Module (ECM) and the Body Control Module (BCM). The BCM is responsible for controlling various electrical components in the vehicle, such as interior lights, power windows, door locks, and security systems. When communication is lost between the ECM and BCM, it can lead to a range of issues affecting the vehicle's performance and functionality.

OBDII Code U0140 Hummer - Lost Communication With Body Control Module
U0140 Hummer Code - Lost Communication With Body Control Module

Common Causes of U0140 Hummer

  1. Faulty wiring or connectors between the ECM and BCM.
  2. Corrosion or damage to the communication lines.
  3. Software glitches or programming errors in the ECM or BCM.
  4. Electrical interference from aftermarket accessories or modifications.
  5. Faulty ECM or BCM components.

Symptoms of U0140 Hummer

  1. Interior lights not working properly or flickering.
  2. Power windows or door locks malfunctioning.
  3. Security system issues, such as false alarms or inability to arm/disarm.
  4. Dashboard warning lights, such as the check engine light, coming on intermittently.
  5. Loss of communication with other control modules in the vehicle.

How to Fix U0140 Hummer

  1. Begin by conducting a thorough inspection of the wiring and connectors between the ECM and BCM to check for any visible damage or corrosion.
  2. Use a diagnostic scan tool to reset the communication between the two modules and clear the DTC.
  3. Check for any software updates or reprogramming that may be available for the ECM and BCM.
  4. If necessary, replace any faulty wiring, connectors, or components in the communication system.
  5. Test the vehicle to ensure that the communication between the ECM and BCM has been restored and that all systems are functioning properly.

Cost to Fix U0140 Hummer

The cost of repairing a U0140 DTC on a Hummer can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $200 to $500 for parts and labor to address this problem. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's recommended to obtain quotes from multiple shops to get a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

What does this mean?

Tech Notes for U0140 Hummer

There is a factory service bulletin for the 2008-2009 HUMMER H2:

2008-2009 HUMMER H2 Factory Service Bulletin OBDII Code U0140

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.

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