AutoCodes – GMC – B3902 2014 GMC Sierra

B3902 2014 GMC Sierra Code - Incorrect Immobilizer Identifier Received

Quick Answer

When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to the vehicle. 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: B3902 2014 GMC Sierra indicates Incorrect Immobilizer Identifier Received.
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 390

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 Jun 16, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3902 2014 GMC Sierra Description

When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to the vehicle. The environment identifier is used to prevent the swapping modules between vehicles. The Body Control Module (BCM) is the keeper of the environment identifier. The instrument cluster, electronic brake control module, HVAC control module, inflatable restraint sensing and diagnostic module, Engine Control Module (ECM), and steering column lock module (if equipped) each learn the environment identifier during their configuration process. During vehicle operation, the BCM sends the immobilizer identifier as a challenge and each module responds to the challenge by sending the environment identifier back to the BCM. If the BCM sends an incorrect immobilizer identifier or a specific number of incorrect environment identifiers are received, vehicle starting is disabled. The Diagnostic Trouble Code (DTC) sets when the control module's environment identifier does not match the environment identifier stored by the BCM.

OBDII Code B3902 2014 GMC Sierra - Incorrect Immobilizer Identifier Received - AutoCodes.com — B3902 2014 GMC Sierra Code - Incorrect Immobilizer Identifier Received

What does this mean?

What are the Possible Causes of the DTC B3902 2014 GMC Sierra?

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 B3902 2014 GMC Sierra?

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 B3902 2014 GMC Sierra 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.

Need more information about the B3902 2014 GMC Sierra code?

Need more information on how to fix the B3902 2014 GMC Sierra code? Get Access to Factory Service Manuals

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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 B3902 2014 GMC Sierra Code

1. What are common symptoms of OBDII code B3902 on a 2014 GMC Sierra?

- Common symptoms include the engine not starting, the vehicle going into anti-theft mode, and the immobilizer system malfunctioning.

2. What does the OBDII code B3902 "Incorrect Immobilizer Identifier Received" mean for a 2014 GMC Sierra?

- This code indicates that the vehicle's immobilizer system has detected an incorrect identifier, leading to a security issue preventing the engine from starting.

3. What are possible causes of OBDII code B3902 on a 2014 GMC Sierra?

- Possible causes include a faulty immobilizer module, issues with the key fob or key transponder, a wiring problem in the immobilizer system, or a communication error between components.

4. How can I diagnose OBDII code B3902 on my 2014 GMC Sierra?

- Diagnosis typically involves using a professional diagnostic scanner to read the code, checking for related trouble codes, inspecting the immobilizer system components, and testing the key fob or transponder.

5. Can OBDII code B3902 on a 2014 GMC Sierra be repaired at home?

- Repairing this code may require specialized tools and knowledge, so it is recommended to consult with a professional mechanic or dealership to accurately diagnose and fix the issue.

6. Are there any temporary solutions to try if I encounter OBDII code B3902 while driving my 2014 GMC Sierra?

- Attempting to disconnect and reconnect the vehicle's battery may reset the immobilizer system temporarily, but it is crucial to address the underlying cause of the code to prevent recurring issues.

7. How much does it typically cost to repair OBDII code B3902 on a 2014 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the immobilizer module, key fob, or addressing wiring problems, which can range from a few hundred to over a thousand dollars.

8. Can OBDII code B3902 on a 2014 GMC Sierra cause any long-term damage if left unrepaired?

- Ignoring this code may lead to continued issues with the vehicle's immobilizer system, potential security risks, and the inconvenience of not being able to start the engine reliably.

9. Is it safe to drive my 2014 GMC Sierra with OBDII code B3902 present?

- It is not recommended to drive the vehicle with this code active, as it may result in the engine not starting unexpectedly, potentially leaving you stranded.

10. How can I prevent OBDII code B3902 from occurring on my 2014 GMC Sierra in the future?

- Regular maintenance of the immobilizer system, ensuring proper key fob function, and promptly addressing any warning signs can help prevent the recurrence of this code.