AutoCodes – Nissan – U0140 2009 Nissan Altima Sedan

U0140 2009 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 2009 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 3,424

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 2009 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 2009 Nissan Altima Sedan - Lost Communication With Body Control Module - AutoCodes.com — U0140 2009 Nissan Altima Sedan Code - Lost Communication With Body Control Module

What does this mean?

What are the Possible Causes of the DTC U0140 2009 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 2009 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 2009 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 2009 Nissan Altima Sedan Code

1. What does the OBDII code U0140 on a 2009 Nissan Altima Sedan mean?

The code U0140 indicates a "Lost Communication With Body Control Module" error, suggesting a communication issue between the vehicle's main engine control module and the body control module.

2. What are common symptoms of a U0140 code in a 2009 Nissan Altima Sedan?

Common symptoms include malfunctioning power windows, door locks, interior lights, or other electrical components controlled by the body control module.

3. What are possible causes of a U0140 code in a 2009 Nissan Altima Sedan?

Potential causes include loose or corroded wiring connections, a faulty body control module, a damaged communication network, or a malfunctioning engine control module.

4. How can I diagnose a U0140 code in my 2009 Nissan Altima Sedan?

Diagnosis typically involves checking the wiring connections, inspecting for physical damage or corrosion, conducting a scan tool communication test, and potentially testing the body control module or engine control module.

5. How can I repair a U0140 code on a 2009 Nissan Altima Sedan?

Repair options may include repairing or replacing damaged wiring, cleaning and securing connections, replacing the body control module, or reprogramming modules as needed.

6. Can a U0140 code in a 2009 Nissan Altima Sedan be fixed at home?

Depending on the specific cause, some DIY enthusiasts may be able to address the issue by checking and securing connections, but diagnosing and repairing electrical issues may require professional assistance.

7. Is it safe to continue driving with a U0140 code in a 2009 Nissan Altima Sedan?

It is not recommended to drive the vehicle with unresolved communication issues between control modules, as it may lead to further electrical malfunctions or safety concerns.

8. How much does it cost to repair a U0140 code on a 2009 Nissan Altima Sedan?

The cost of repairs can vary significantly based on the specific cause of the issue, the need for replacement parts, and whether professional labor is required.

9. Can a U0140 code on a 2009 Nissan Altima Sedan cause other problems in the vehicle?

Yes, unresolved communication issues between control modules can potentially lead to further electrical malfunctions, affecting various vehicle systems controlled by the body control module.

10. How often does a U0140 code occur in a 2009 Nissan Altima Sedan?

While not extremely common, the U0140 code can occur in vehicles like the 2009 Nissan Altima Sedan due to wiring issues, module failures, or other electrical problems.