AutoCodes – Chevrolet – B3902 2015 Chevrolet Silverado

B3902 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado 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 343

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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado - Incorrect Immobilizer Identifier Received - AutoCodes.com — B3902 2015 Chevrolet Silverado Code - Incorrect Immobilizer Identifier Received

What does this mean?

What are the Possible Causes of the DTC B3902 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado code?

Need more information on how to fix the B3902 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado Code

1. What does the OBDII code B3902 mean on a 2015 Chevrolet Silverado?

The code B3902 indicates that the vehicle's immobilizer system has detected an incorrect identifier from the key or ignition system, preventing the engine from starting.

2. What are the common symptoms of the B3902 code in a 2015 Chevrolet Silverado?

Symptoms include the engine not starting, the security light staying illuminated on the dashboard, and the vehicle failing to recognize the key.

3. What causes the B3902 code to appear on a 2015 Chevrolet Silverado?

Common causes include a faulty key fob, a damaged transponder chip in the key, issues with the immobilizer module, or a wiring problem in the security system.

4. Can a weak key fob battery trigger the B3902 code?

Yes, a weak or dead key fob battery can disrupt communication between the key and the immobilizer system, leading to the B3902 code.

5. How can I fix the B3902 code on my 2015 Chevrolet Silverado?

Start by replacing the key fob battery. If the issue persists, reprogram the key, inspect the immobilizer module, or consult a professional mechanic for further diagnosis.

6. Does the B3902 code mean I need a new key for my 2015 Silverado?

Not necessarily. The issue may be resolved by reprogramming the existing key or replacing the battery. However, if the key is damaged, a replacement may be required.

7. Can a faulty immobilizer module cause the B3902 code?

Yes, a malfunctioning immobilizer module can fail to recognize the correct key identifier, triggering the B3902 code.

8. Can I drive my 2015 Chevrolet Silverado with the B3902 code?

No, the B3902 code usually prevents the engine from starting, so the vehicle will not be drivable until the issue is resolved.

9. How much does it cost to fix the B3902 code on a 2015 Chevrolet Silverado?

The cost varies depending on the cause. Replacing a key fob battery is inexpensive, while key reprogramming or immobilizer repairs may cost $100 to $500 or more.

10. Is it necessary to visit a dealership to fix the B3902 code?

Not always. A qualified locksmith or mechanic with the proper tools can often diagnose and fix the issue, but dealership assistance may be needed for key programming or immobilizer replacement.