AutoCodes – Pontiac – U0140 Pontiac

U0140 Pontiac Code - Lost Communication With Body Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection. 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 Pontiac indicates Lost Communication With Body Control Module.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection.
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 5,499

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 Pontiac Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Body Control Module (BCM) has not been received.

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

What does this mean?

What are the Possible Causes of the DTC U0140 Pontiac?

Faulty Body Control Module (BCM)
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection

How to Fix the DTC U0140 Pontiac?

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 Pontiac 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 Pontiac Code

1. What does OBDII code U0140 mean on a Pontiac?

Code U0140 indicates a loss of communication with the Body Control Module (BCM), which manages various vehicle functions like lighting, locks, and accessories.

2. What are the symptoms of code U0140 in a Pontiac?

Symptoms may include non-functional door locks, inoperative interior lights, issues with the instrument cluster, or warning lights on the dashboard.

3. What causes the U0140 code in a Pontiac?

Common causes include a faulty BCM, damaged wiring or connectors, issues with the CAN bus network, or a dead vehicle battery.

4. Can a dead battery trigger the U0140 code?

Yes, a dead or weak battery can disrupt communication with the BCM, potentially triggering the U0140 code.

5. How do you diagnose code U0140 in a Pontiac?

Diagnosis involves checking BCM-related fuses, inspecting wiring and connectors for damage, testing the CAN bus network, and verifying BCM functionality.

6. Can I drive my Pontiac with the U0140 code?

While the vehicle may still run, loss of BCM communication can affect essential functions and safety features, so itâ€™s best to address the issue promptly.

7. How do you fix the U0140 code in a Pontiac?

Repairs can include replacing damaged wiring, cleaning or reconnecting loose connectors, resetting the BCM, or replacing the BCM if it has failed.

8. Does the U0140 code always mean the BCM is faulty?

No, the code could also be caused by wiring issues, connector problems, or a network communication fault, not necessarily a faulty BCM.

9. How much does it cost to fix the U0140 code on a Pontiac?

Repair costs vary depending on the issue, ranging from $50 for basic wiring fixes to $500 or more to replace and program the BCM.

10. Can a software update fix the U0140 code in a Pontiac?

In some cases, a BCM software update from the manufacturer may resolve communication issues, but this depends on the specific vehicle model and problem.