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Engine-Codes – Generic – U0140

U0140 Code - Lost Communication with Body Control Module

Quick Answer

The U0140 diagnostic trouble code indicates that the vehicle has lost communication with the Body Control Module (BCM). Common causes include Corroded or damaged wiring harnesses, Faulty Body Control Module, Software malfunction. 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 indicates Lost Communication with Body Control Module.
Common causes
Common causes include Corroded or damaged wiring harnesses, Faulty Body Control Module, Software malfunction.
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 11, 2024
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Code U0140 Description

The U0140 diagnostic trouble code indicates that the vehicle has lost communication with the Body Control Module (BCM). The BCM is a crucial component in modern vehicles as it controls various functions related to the body of the vehicle, such as the lights, power windows, door locks, and more. When communication with the BCM is lost, it can lead to a range of issues affecting the vehicle's performance and functionality.

OBDII Code U0140 - Lost Communication with Body Control Module
U0140 Code - Lost Communication with Body Control Module

Common Causes of U0140

  1. Corroded or damaged wiring harnesses.
  2. Faulty Body Control Module.
  3. Software malfunction.
  4. Communication network issues.
  5. Water damage to the BCM.

Symptoms of U0140

  1. Non-functional power windows and door locks.
  2. Inoperative interior and exterior lights.
  3. Malfunctioning key fob.
  4. Warning lights on the dashboard.
  5. Unresponsive climate control system.

How to Fix U0140

  1. Diagnose the issue using a diagnostic scanner to pinpoint the exact cause of the communication loss.
  2. Inspect the wiring harnesses for any signs of damage or corrosion and repair or replace as necessary.
  3. Test the Body Control Module for faults and replace if deemed faulty.
  4. Check for software updates for the BCM and perform reprogramming if needed.
  5. Ensure proper communication network connections and address any issues found.

Cost to Fix U0140

The typical repair costs for addressing a U0140 code can range from $200 to $800, depending on the specific cause of the issue and the parts and labor required. It's important to note that the cost can vary based on factors such as location, vehicle make and model, and the extent of the repairs needed. Additionally, diagnosis time and labor rates at auto repair shops can vary, with rates typically ranging between $80 and $150 per hour. It is recommended to obtain quotes from local auto repair shops to get a more accurate estimate for this repair.

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Code U0140 Information for Specific Makes

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 Code

1. What are the common symptoms of OBDII code U0140, Lost Communication with Body Control Module?

- Common symptoms include issues with power windows, door locks, interior lights, and other body control functions not working properly.

2. What are some possible causes of U0140 code?

- Possible causes include a faulty body control module, damaged wiring or connectors, software issues, or a malfunctioning communication network.

3. How can I diagnose the U0140 code?

- Diagnose the U0140 code by using a professional OBDII scanner to read and interpret the code, checking the body control module for any visible damage, and inspecting the wiring for any issues.

4. What are some repair tips for fixing the U0140 code?

- Repair tips include checking and repairing any damaged wiring or connectors, reprogramming the body control module if needed, and ensuring proper communication on the network.

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

- It is not recommended to drive the vehicle with the U0140 code present as it can lead to further electrical issues and safety concerns.

6. How much does it cost to repair the U0140 code?

- The cost of repairing the U0140 code can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars.

7. Can a DIY enthusiast fix the U0140 code at home?

- While some basic troubleshooting steps can be done at home, diagnosing and repairing the U0140 code may require specialized tools and expertise, so it is recommended to seek professional help.

8. Is the U0140 code a serious issue?

- The U0140 code should be addressed promptly as it can affect the proper functioning of important vehicle systems controlled by the body control module.

9. How long does it take to repair the U0140 code?

- The repair time for the U0140 code can vary depending on the exact cause of the issue and the availability of parts, but it may take a few hours to a full day at the repair shop.

10. Can resetting the OBDII code U0140 make it go away permanently?

- Resetting the code may temporarily clear the warning, but if the underlying issue causing the U0140 code is not fixed, it is likely to reappear. It is important to diagnose and repair the root cause of the problem.

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