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U0140 Chevrolet Code - Lost Communication With Body Control Module

Quick Answer

The U0140 code for Chevrolet vehicles indicates that there has been a communication failure between the Engine Control Module (ECM) and the Body Control Module (BCM). Common causes include Faulty wiring connections between the ECM and BCM, Corrosion or damage to wiring harnesses, Malfunctioning Body Control Module. 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 Chevrolet indicates Lost Communication With Body Control Module.
Common causes
Common causes include Faulty wiring connections between the ECM and BCM, Corrosion or damage to wiring harnesses, Malfunctioning Body Control Module.
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 09, 2024
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Code U0140 Chevrolet Description

The U0140 code for Chevrolet vehicles indicates that there has been a communication failure between the Engine Control Module (ECM) and the Body Control Module (BCM). The Body Control Module is responsible for managing various functions related to the vehicle's body, such as lighting, door locks, and security systems. When communication is lost between the ECM and BCM, it can lead to a range of issues that affect the vehicle's performance and functionality.

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

Common Causes of U0140 Chevrolet

  1. Faulty wiring connections between the ECM and BCM
  2. Corrosion or damage to wiring harnesses
  3. Malfunctioning Body Control Module
  4. Electrical interference or short circuits in the system
  5. Software issues related to the control modules

Symptoms of U0140 Chevrolet

  1. Check Engine Light illuminated on the dashboard
  2. Malfunctioning interior and exterior lighting
  3. Power windows not working properly
  4. Central locking system malfunctioning
  5. Security features not functioning correctly

How to Fix U0140 Chevrolet

  1. Begin by conducting a thorough inspection of the wiring harnesses and connectors between the ECM and BCM to check for any signs of damage or corrosion.
  2. Test the communication between the modules using a diagnostic tool to identify the specific source of the communication failure.
  3. If the issue is related to a faulty Body Control Module, it may need to be replaced with a new unit and programmed to work with the vehicle's system.
  4. Clear the diagnostic trouble codes from the vehicle's memory and test the functionality of the affected systems to ensure that the communication has been restored.
  5. Finally, conduct a road test to verify that the problem has been resolved and that the Check Engine Light has been extinguished.

Cost to Fix U0140 Chevrolet

The cost of repairing the U0140 code on a Chevrolet vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing a faulty Body Control Module can range from $300 to $800, including parts and labor. Additional costs may be incurred for diagnostic testing, wiring repairs, or other related components. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local providers for a more accurate estimate based on your location and vehicle model.

What does this mean?

Tech Notes for U0140 Chevrolet

There is a factory service bulletin for the following Chevrolet models:

2007-2010 Chevrolet Avalanche

2007-2010 Chevrolet Corvette

2007-2010 Chevrolet Silverado

2007-2010 Chevrolet Suburban

2007-2010 Chevrolet Tahoe

2008-2010 Chevrolet Silverado Hybrid

2008-2010 Chevrolet Tahoe Hybrid

Chevrolet Factory Service Bulletin OBDII Code U0140

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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.

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