AutoCodes – GMC – B3902 2016 GMC Sierra

B3902 2016 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 2016 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 217

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 2016 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 2016 GMC Sierra - Incorrect Immobilizer Identifier Received - AutoCodes.com — B3902 2016 GMC Sierra Code - Incorrect Immobilizer Identifier Received

What does this mean?

What are the Possible Causes of the DTC B3902 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the B3902 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B3902 on a 2016 GMC Sierra?

- Common symptoms include the vehicle not starting, the engine cranking but not starting, and the security light staying on.

2. What causes the OBDII code B3902 on a 2016 GMC Sierra?

- The code B3902 is typically triggered when the immobilizer system fails to recognize the key, leading to an incorrect immobilizer identifier received by the system.

3. How can I diagnose the OBDII code B3902 on my 2016 GMC Sierra?

- Diagnosis involves checking the key fob battery, ensuring the key is programmed correctly, and inspecting the immobilizer system components for any issues.

4. Can a DIY enthusiast repair the OBDII code B3902 on a 2016 GMC Sierra?

- Repairing the code B3902 may require specialized tools and knowledge, so it's recommended to consult a professional mechanic or dealership for proper diagnosis and repair.

5. How much does it cost to fix the OBDII code B3902 on a 2016 GMC Sierra?

- The repair cost for code B3902 can vary depending on the exact cause of the issue, but it's advisable to budget for diagnostic fees, parts replacement, and labor costs.

6. Are there any temporary solutions to bypass the OBDII code B3902 on a 2016 GMC Sierra?

- Attempting to bypass or reset the immobilizer system without proper diagnosis and repair may lead to further complications, and it's not recommended as a temporary solution.

7. Can a dead key fob battery trigger the OBDII code B3902 on a 2016 GMC Sierra?

- Yes, a dead or low battery in the key fob can sometimes cause communication issues with the immobilizer system, leading to the code B3902 being triggered.

8. Is it safe to continue driving with the OBDII code B3902 present on a 2016 GMC Sierra?

- It is not recommended to drive the vehicle with the code B3902 present, as it may lead to potential starting or security issues that could affect the operation of the vehicle.

9. How long does it typically take to repair the OBDII code B3902 on a 2016 GMC Sierra?

- The repair time for code B3902 can vary depending on the exact cause of the issue and the availability of parts, but it's best to consult with a professional for an accurate estimate.

10. Will resetting the ECU clear the OBDII code B3902 on a 2016 GMC Sierra?

- Resetting the ECU may temporarily clear the code, but if the underlying issue with the immobilizer system is not addressed, the code is likely to reappear.