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U0140 2012 Nissan Altima Sedan Code - Lost Communication With Body Control Module

Quick Answer

The U0140 diagnostic trouble code (DTC) for a 2012 Nissan Altima Sedan indicates that there is a communication issue 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 between modules, Software issues or programming errors within the modules. 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 2012 Nissan Altima Sedan 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 between modules, Software issues or programming errors within the modules.
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 17, 2024
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Code U0140 2012 Nissan Altima Sedan Description

The U0140 diagnostic trouble code (DTC) for a 2012 Nissan Altima Sedan indicates that there is a communication issue between the vehicle's engine control module (ECM) and the body control module (BCM). The BCM is responsible for controlling various functions related to the vehicle's body, such as lighting, power windows, door locks, and other accessories. 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 2012 Nissan Altima Sedan - Lost Communication With Body Control Module
U0140 2012 Nissan Altima Sedan Code - Lost Communication With Body Control Module

Common Causes of U0140 2012 Nissan Altima Sedan

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

Symptoms of U0140 2012 Nissan Altima Sedan

  1. Flickering lights or erratic behavior of lighting systems.
  2. Non-responsive power windows or door locks.
  3. Intermittent issues with other body-related functions.
  4. Illumination of the check engine light or other warning lights on the dashboard.

How to Fix U0140 2012 Nissan Altima Sedan

  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. Repair or replace any damaged components as needed.
  2. Use a diagnostic scan tool to reset the communication between the modules and clear the DTC from the vehicle's memory.
  3. Check for any software updates or reprogramming procedures recommended by the manufacturer to address communication issues.
  4. Test the vehicle to ensure that the communication between the ECM and BCM has been restored and that all body-related functions are operating correctly.
  5. If the issue persists, consider replacing the ECM or BCM components that may be faulty and retest the vehicle to confirm the repair.

Cost to Fix U0140 2012 Nissan Altima Sedan

The typical repair costs for addressing a U0140 code on a 2012 Nissan Altima Sedan can vary depending on the specific cause of the communication issue. In general, the cost of parts for wiring repairs or component replacements may range from $100 to $500, while labor costs can add an additional $100 to $300 to the total repair bill. Overall, the total cost of addressing this issue could range from $200 to $800, depending on the extent of the repairs needed.

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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 2012 Nissan Altima Sedan Code

1. What does the OBDII code U0140 in a 2012 Nissan Altima Sedan indicate?

The code U0140 indicates that there is a communication problem between the vehicle's ECM (Engine Control Module) and the Body Control Module (BCM).

2. What are some common symptoms of the U0140 code in a 2012 Nissan Altima Sedan?

Common symptoms may include issues with power windows, door locks, interior lights, or other body control functions not working properly. The vehicle may also experience electrical issues or warning lights on the dashboard.

3. What are the possible causes of the U0140 code in a 2012 Nissan Altima Sedan?

Potential causes include loose or damaged wiring/connectors between the ECM and BCM, a faulty BCM, a malfunctioning ECM, or a software communication error.

4. How can I diagnose the U0140 code in my 2012 Nissan Altima Sedan?

Diagnosis typically involves checking the wiring and connectors between the ECM and BCM for any visible damage or looseness. Using a diagnostic scanner to communicate with the modules can help pinpoint the issue.

5. Can I drive my 2012 Nissan Altima Sedan with the U0140 code present?

It is generally not recommended to drive the vehicle with the U0140 code present, as it can affect the proper functioning of essential body control systems. Seek professional assistance to diagnose and repair the issue.

6. How can the U0140 code in a 2012 Nissan Altima Sedan be repaired?

Repairing the U0140 code may involve fixing any damaged wiring or connectors, resetting the communication between the ECM and BCM, reprogramming the modules, or replacing a faulty BCM or ECM.

7. Is it possible to reset the U0140 code in a 2012 Nissan Altima Sedan without professional help?

While you can try clearing the code with an OBDII scanner, it is essential to address the underlying issue causing the communication problem to prevent the code from reoccurring.

8. Are there any DIY tips for troubleshooting the U0140 code in a 2012 Nissan Altima Sedan?

DIY troubleshooting tips include checking the fuses related to the ECM and BCM, inspecting wiring harnesses for damage, and ensuring all connectors are securely plugged in.

9. How much does it typically cost to repair the U0140 code in a 2012 Nissan Altima Sedan?

The cost of repairing the U0140 code can vary depending on the specific issue causing the communication problem. Costs may include labor charges, replacement parts, and diagnostic fees.

10. Can the U0140 code in a 2012 Nissan Altima Sedan be a recurring problem?

If the root cause of the U0140 code is not properly addressed during repairs, it can potentially become a recurring issue. Ensure thorough diagnosis and repair to prevent future occurrences.

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