AutoCodes – Chevrolet – B3902 Chevrolet

B3902 Chevrolet 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 Chevrolet 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 29,237

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 Chevrolet 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 Chevrolet - Incorrect Immobilizer Identifier Received - AutoCodes.com — B3902 Chevrolet Code - Incorrect Immobilizer Identifier Received

What does this mean?

What are the Possible Causes of the DTC B3902 Chevrolet?

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 Chevrolet?

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 Chevrolet 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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Get the B3902 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B3902 2014 Chevrolet Silverado — Incorrect Immobilizer Identifier Received
B3902 2015 Chevrolet Silverado — Incorrect Immobilizer Identifier Received
B3902 2016 Chevrolet Silverado — Incorrect Immobilizer Identifier Received
B3902 2017 Chevrolet Silverado — Incorrect Immobilizer Identifier Received
B3902 2018 Chevrolet Silverado — Incorrect Immobilizer Identifier Received

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 Chevrolet Code

1. What are the common symptoms of OBDII code B3902 Chevrolet "Incorrect Immobilizer Identifier Received"?

- Common symptoms include the vehicle not starting, the engine stalling, and the immobilizer light staying illuminated.

2. What are the possible causes of OBDII code B3902 Chevrolet?

- Possible causes include a faulty immobilizer module, issues with the immobilizer antenna, or a communication error between the immobilizer system and the vehicle's computer.

3. How can I diagnose OBDII code B3902 Chevrolet?

- Diagnosis typically involves using a diagnostic scanner to retrieve the specific trouble code, checking the immobilizer system for any visible damage, and testing the communication between the immobilizer components.

4. Can I still drive my vehicle with OBDII code B3902 Chevrolet active?

- It is not recommended to drive the vehicle with this code active, as it may lead to unexpected stalling or starting issues while driving.

5. How can I repair OBDII code B3902 Chevrolet?

- Repair options may include reprogramming the immobilizer system, replacing a faulty immobilizer module or antenna, or addressing any communication issues between the immobilizer components.

6. Is it necessary to reset the OBDII code B3902 Chevrolet after repairs are made?

- Yes, it is important to clear the code using a diagnostic scanner after repairs are completed to reset the system and ensure the issue has been resolved.

7. Can I fix OBDII code B3902 Chevrolet myself, or do I need a professional mechanic?

- Depending on your automotive repair experience and access to tools, you may be able to address some of the simpler causes of this code yourself. However, complex issues may require the expertise of a professional mechanic.

8. How much does it typically cost to repair OBDII code B3902 Chevrolet at a repair shop?

- The cost of repairs for this code can vary depending on the specific cause and the labor rates of the repair shop. It is recommended to get a diagnostic assessment to determine the exact cost.

9. Are there any preventive measures to avoid OBDII code B3902 Chevrolet in the future?

- Regular maintenance of the immobilizer system, such as checking for loose connections and keeping the components clean, can help prevent issues that may trigger this code.

10. Will OBDII code B3902 Chevrolet cause any long-term damage to my vehicle if left unresolved?

- Ignoring this code may lead to potential safety hazards and could cause further damage to the immobilizer system or other related components over time. It is best to address the issue promptly.