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B3902 2018 Chevrolet Silverado Code - Incorrect Immobilizer Identifier Received

Quick Answer

The B3902 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates that an incorrect immobilizer identifier has been received by the vehicle's electronic control module (ECM). Common causes include Faulty key or key fob, Malfunctioning immobilizer system, ECM communication issues. 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 key or key fob, Malfunctioning immobilizer system, ECM communication issues.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code B3902 2018 Chevrolet Silverado Description

The B3902 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates that an incorrect immobilizer identifier has been received by the vehicle's electronic control module (ECM). The immobilizer system is a security feature in modern vehicles that prevents the engine from starting unless the correct key or key fob is used. When the immobilizer system detects an incorrect identifier, it will trigger a fault code like B3902.

OBDII Code B3902 2018 Chevrolet Silverado - Incorrect Immobilizer Identifier Received
B3902 2018 Chevrolet Silverado Code - Incorrect Immobilizer Identifier Received

Common Causes of B3902 2018 Chevrolet Silverado

  1. Faulty key or key fob
  2. Malfunctioning immobilizer system
  3. ECM communication issues
  4. Wiring or connection problems in the immobilizer system
  5. Aftermarket modifications affecting the immobilizer system

Symptoms of B3902 2018 Chevrolet Silverado

  1. Engine cranks but does not start
  2. Engine starts but immediately shuts off
  3. Immobilizer warning light illuminated on the dashboard
  4. Key or key fob not recognized by the immobilizer system

How to Fix B3902 2018 Chevrolet Silverado

  1. Check and replace the key or key fob: Start by checking the key or key fob for any visible damage or signs of malfunction. If necessary, replace them with a new set programmed to the vehicle.
  2. Diagnostic scan: Use a diagnostic scan tool to retrieve the specific error codes and pinpoint the exact cause of the issue.
  3. Inspect immobilizer system components: Inspect the immobilizer system components, including the immobilizer antenna, transponder chip, and ignition switch, for any signs of damage or malfunction.
  4. Repair or replace faulty components: Repair or replace any faulty components identified during the diagnostic process, such as the immobilizer antenna, transponder chip, or ECM.
  5. Reprogram ECM: If necessary, reprogram the ECM to synchronize it with the immobilizer system and ensure proper communication.

Cost to Fix B3902 2018 Chevrolet Silverado

The typical repair costs for addressing the B3902 code in a 2018 Chevrolet Silverado can vary depending on the exact cause of the issue and the parts needed for repair. On average, the parts for this repair could range from $100 to $300, while labor costs could add another $100 to $200 to the total bill. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, labor rates, and the extent of the repairs needed. It's advisable to consult with a professional mechanic or dealership for a more accurate cost estimate based on your specific situation.

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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 $50–$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 doesn’t resolve the problem, visiting a dealership or certified technician is recommended for advanced diagnostics.

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