AutoCodes – Chevrolet – B3902 2018 Chevrolet Silverado

B3902 2018 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 2018 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 417

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 2018 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 2018 Chevrolet Silverado - Incorrect Immobilizer Identifier Received - AutoCodes.com — B3902 2018 Chevrolet Silverado Code - Incorrect Immobilizer Identifier Received

What does this mean?

What are the Possible Causes of the DTC B3902 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?

Need more information on how to fix the B3902 2018 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 2018 Chevrolet Silverado Code

1. What does OBDII code B3902 mean on a 2018 Chevrolet Silverado?

Code B3902 indicates "Incorrect Immobilizer Identifier Received," meaning the vehicle's anti-theft system has detected a mismatch between the key and the immobilizer.

2. What are the common symptoms of code B3902 in a 2018 Chevrolet Silverado?

Symptoms include the engine not starting, the security light staying on or flashing, and potential issues with locking or unlocking the vehicle.

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

Common causes include a faulty key fob, a damaged immobilizer module, incorrect programming, or interference from aftermarket electronics.

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

Yes, a weak or dead key fob battery can cause communication issues with the immobilizer, leading to this code.

5. How do I reset code B3902 on a 2018 Chevrolet Silverado?

Fix the underlying issue first, then clear the code with an OBDII scanner. If the issue persists, the code will return.

6. Do I need to reprogram my key fob to fix code B3902?

Reprogramming may be necessary if the key fob has lost synchronization with the immobilizer system. Consult a dealership or qualified locksmith.

7. Can code B3902 be caused by a damaged ignition switch?

Yes, a damaged or malfunctioning ignition switch can disrupt the communication between the key and the immobilizer, triggering this code.

8. How much does it cost to fix code B3902 on a Chevy Silverado?

Costs can vary widely, ranging from $50â€“$150 for a new key fob or battery, up to $500 or more for immobilizer module repairs or reprogramming.

9. Can aftermarket electronics interfere with the immobilizer and cause code B3902?

Yes, aftermarket alarm systems, remote starters, or other electronic modifications can interfere with the immobilizer system and trigger this code.

10. Should I take my Silverado to a dealership for code B3902?

If basic troubleshooting like replacing the key fob battery or checking for interference doesnâ€™t resolve the problem, visiting a dealership or certified technician is recommended for advanced diagnostics.