AutoCodes – Nissan – U0140 Nissan

U0140 Nissan Code - Lost Communication With Body Control Module

Quick Answer

The Controller Area Network (CAN) is a serial communication line for real time applications. Common causes include CAN communication line between Body Control Module (BCM) and Engine Control Module (ECM), Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted. 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 Nissan indicates Lost Communication With Body Control Module.
Common causes: Common causes include CAN communication line between Body Control Module (BCM) and Engine Control Module (ECM), Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted.
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.

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Code Popularity 14,347

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0140 Nissan Description

The Controller Area Network (CAN) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads the required data only. The Diagnostic Trouble Code (DTC) sets when the Engine Control Module (ECM) is not transmitting or receiving CAN communication signal of OBDII (emission related diagnosis) with Body Control Module (BCM) for 2 seconds or more.

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OBDII Code U0140 Nissan - Lost Communication With Body Control Module - AutoCodes.com — U0140 Nissan Code - Lost Communication With Body Control Module

What does this mean?

What are the Possible Causes of the DTC U0140 Nissan?

CAN communication line between Body Control Module (BCM) and Engine Control Module (ECM)
Faulty Body Control Module (BCM)
Body Control Module (BCM) harness is open or shorted
Body Control Module (BCM) circuit poor electrical connection

How to Fix the DTC U0140 Nissan?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0140 Nissan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need more information on how to fix the U0140 Nissan code? Get Access to Factory Service Manuals

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Information for Specific Nissan Models

U0140 2009 Nissan Altima Sedan — Lost Communication With Body Control Module
U0140 2010 Nissan Altima Sedan — Lost Communication With Body Control Module
U0140 2011 Nissan Altima Sedan — Lost Communication With Body Control Module
U0140 2012 Nissan Altima Sedan — Lost Communication With Body Control Module
U0140 2010 Nissan Sentra — Lost Communication With Body Control Module
U0140 2011 Nissan Sentra — Lost Communication With Body Control Module
U0140 2012 Nissan Sentra — Lost Communication With Body Control Module
U0140 2010 Nissan Versa — Lost Communication With Body Control Module
U0140 2011 Nissan Versa — Lost Communication With Body Control Module
U0140 2012 Nissan Versa — Lost Communication With Body Control Module

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 Nissan Code

1. What are the common symptoms of OBDII code U0140 in a Nissan related to lost communication with the Body Control Module?

- Common symptoms include non-functioning power windows, door locks, interior lights, and issues with the vehicle's security system.

2. What are the possible causes of the U0140 code in a Nissan?

- The code may be triggered by a faulty Body Control Module, damaged wiring, loose connections, or a drained battery.

3. How can I diagnose the U0140 code in my Nissan?

- Diagnosing this code typically involves using a diagnostic scanner to read the trouble codes, checking the connections to the Body Control Module, and inspecting the wiring harness for any damage.

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

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

5. How can I repair the U0140 code in my Nissan?

- Repairing the U0140 code often involves addressing the underlying cause, such as replacing the Body Control Module, repairing damaged wiring, or ensuring all connections are secure.

6. Are there any DIY tips for fixing the U0140 code in a Nissan?

- While some basic checks like inspecting connections and fuses can be done by DIY enthusiasts, diagnosing and repairing the U0140 code often requires advanced diagnostic tools and expertise.

7. Is it common for the U0140 code to reoccur in a Nissan after repair?

- If the root cause of the U0140 code is not properly addressed during repair, there is a possibility for the code to reoccur.

8. Can a drained battery cause the U0140 code in a Nissan?

- Yes, a drained or weak battery can disrupt communication with the Body Control Module and trigger the U0140 code.

9. How long does it typically take to fix the U0140 code in a Nissan at a repair shop?

- The time taken to fix the U0140 code can vary depending on the cause and extent of the issue, but it may take a few hours to a full day in some cases.

10. Is it necessary to reset the OBDII system after repairing the U0140 code in a Nissan?

- Yes, it is important to clear the trouble codes and reset the OBDII system after repairing the U0140 code to ensure proper functioning and accurate diagnostics in the future.