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U0140 Ford Code - Lost Communication With Body Control Module

Quick Answer

When the U0140 code appears on a Ford vehicle, it indicates that there is a communication problem between the 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 bus circuits, Faulty 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 Ford 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 bus circuits, Faulty 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 Aug 30, 2024
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Code U0140 Ford Description

When the U0140 code appears on a Ford vehicle, it indicates that there is a communication problem between the engine control module (ECM) and the body control module (BCM). The body control module is responsible for controlling various functions related to the vehicle's interior, such as the power windows, door locks, and interior lights. When communication is lost between the ECM and BCM, it can lead to issues with these functions as well as potentially impacting other systems in the vehicle.

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

Common Causes of U0140 Ford

  1. Faulty wiring or connectors between the ECM and BCM
  2. Corrosion or damage to the communication bus circuits
  3. Faulty ECM or BCM
  4. Software issues within the ECM or BCM
  5. Electrical interference or grounding issues

Symptoms of U0140 Ford

  1. Non-functional power windows or door locks
  2. Interior lights not working
  3. Malfunctioning climate control system
  4. Dashboard warning lights illuminated
  5. Problems with remote keyless entry system

How to Fix U0140 Ford

  1. Begin by performing a thorough inspection of the wiring and connectors between the ECM and BCM to check for any damage or corrosion.
  2. Use a diagnostic scan tool to reset the communication between the two modules and clear the code.
  3. Check for any software updates available for the ECM and BCM and perform the necessary updates.
  4. If the issue persists, consider replacing either the ECM or BCM, depending on which module is found to be faulty.
  5. After any repairs or replacements are made, clear the code and test the vehicle to ensure the issue has been resolved.

Cost to Fix U0140 Ford

The cost of repairing a U0140 code on a Ford vehicle can vary depending on the specific cause of the communication error and the extent of the repairs needed. On average, the repair costs for this issue can range from $200 to $600, including parts and labor. However, it is important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate.

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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 U0140 Ford Code

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

Common symptoms include dashboard warning lights, loss of communication with the body control module, power window issues, and malfunctioning interior lights.

2. What could be causing the U0140 code indicating a lost communication with the Body Control Module in a Ford vehicle?

Possible causes include a faulty body control module, damaged wiring or connectors, low battery voltage, or a software glitch in the vehicle's communication system.

3. How can I diagnose the U0140 code in my Ford to determine the exact issue?

To diagnose the U0140 code, a professional diagnostic scan tool is recommended to communicate with the vehicle's onboard computer system and pinpoint the source of the communication loss with the body control module.

4. Can I still drive my Ford with the U0140 code present?

It is not recommended to drive your Ford with the U0140 code active, as it may lead to further electrical issues and potential safety hazards due to the loss of communication with the body control module.

5. Is it possible to repair the U0140 code issue in a Ford vehicle without professional help?

While some basic troubleshooting steps like checking for loose connections or blown fuses can be done at home, resolving the U0140 code usually requires the expertise of a qualified mechanic to diagnose and repair the underlying problem effectively.

6. How much does it typically cost to fix the U0140 code related to a lost communication with the Body Control Module in a Ford vehicle?

The cost of fixing the U0140 code can vary depending on the exact cause of the issue, but it may range from $200 to $600 or more, including parts and labor.

7. Can a DIY enthusiast with automotive experience attempt to fix the U0140 code issue in a Ford vehicle?

While basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the U0140 code usually requires specialized tools and expertise, so it is recommended to consult a professional mechanic for this issue.

8. What are the potential risks of ignoring the U0140 code indicating a lost communication with the Body Control Module in a Ford vehicle?

Ignoring the U0140 code can lead to further electrical problems, malfunctioning vehicle systems, and potential safety risks due to the inability to communicate effectively with the body control module.

9. How long does it usually take to repair the U0140 code in a Ford vehicle?

The repair time for the U0140 code can vary depending on the complexity of the issue and the availability of parts, but it typically takes a few hours to a full day for a mechanic to diagnose and fix the problem.

10. Are there any preventive measures to avoid encountering the U0140 code related to a lost communication with the Body Control Module in a Ford vehicle?

Regular maintenance checks, keeping the vehicle's electrical system in good condition, and addressing any warning signs promptly can help prevent issues like the U0140 code from occurring in a Ford vehicle.

Discuss the causes and fixes for U0140 Ford OBDII Code

Submit a New Comment

  • I own a 2013 f150 Stx 5.0 4x4 and I changed my Brake pads on left rear and right rear tires and ever since I have had my Amber ABS light on,My Red (!)(P)BRAKE light on and my ?~~ light on. Got DTC #'s: C1299,U0140,U0114 and U0155. Any help would be greatly appreciated.
    Thank you much
    Brandon Johnson

    Reply to Comment

  • Too many codes and most of the codes are for lost communication. I suggest clearing all the codes and check what codes comes back first. Also, check the battery charge, low battery charge could cause similar problems.

    Reply to Comment

  • U0140 ford focus Bj 2016

    Reply to Comment

    • The fault code U0140 in your 2016 Ford Focus means "Lost Communication with Body Control Module (BCM)." The BCM controls various functions like door locks, power windows, and lighting. When communication between the Engine Control Module (ECM) and the BCM is interrupted, it can cause these systems to malfunction.

      Possible Causes:

      • Faulty BCM: A malfunctioning BCM can disrupt communication.
      • Damaged or Corroded Wiring: Problems in the wiring or connectors between the ECM and BCM can impede signal transmission.
      • Software Issues: Outdated or faulty software in the BCM or ECM may cause communication problems.
      • Electrical Interference: Problems with power supply or grounding can affect communication.

      Symptoms:

      • Warning lights on the dashboard.
      • Malfunctions in systems like power windows, door locks, or interior lighting.
      • Issues with remote access functions.

      Recommended Actions:

      1. Visual Inspection: Check the wiring and connectors between the ECM and BCM for any damage or corrosion.
      2. Use a Diagnostic Tool: Confirm the fault code and gather more information with an OBD-II scan tool.
      3. Software Updates: Look for any available software updates for the ECM or BCM and apply them if needed.
      4. Professional Diagnosis: If the issue persists, consult a professional to have the BCM and related systems thoroughly checked.

      Addressing this code promptly is important to ensure that vehicle control systems function correctly.

      Reply to Comment