AutoCodes – Nissan – U0140 2012 Nissan Altima Sedan

U0140 2012 Nissan Altima Sedan 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 2012 Nissan Altima Sedan 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 3,128

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 2012 Nissan Altima Sedan 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.

OBDII Code U0140 2012 Nissan Altima Sedan - Lost Communication With Body Control Module - AutoCodes.com — U0140 2012 Nissan Altima Sedan Code - Lost Communication With Body Control Module

What does this mean?

What are the Possible Causes of the DTC U0140 2012 Nissan Altima Sedan?

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 2012 Nissan Altima Sedan?

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 2012 Nissan Altima Sedan 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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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.