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B3902 2014 GMC Sierra Code - Incorrect Immobilizer Identifier Received

Quick Answer

The B3902 code for a 2014 GMC Sierra indicates that an incorrect immobilizer identifier has been received by the vehicle's immobilizer system. Common causes include Faulty key fob or key transponder, ECM software glitch, Wiring issues in the immobilizer system. 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 2014 GMC Sierra indicates Incorrect Immobilizer Identifier Received.
Common causes
Common causes include Faulty key fob or key transponder, ECM software glitch, Wiring issues in the immobilizer system.
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 06, 2024
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Code B3902 2014 GMC Sierra Description

The B3902 code for a 2014 GMC Sierra indicates that an incorrect immobilizer identifier has been received by the vehicle's immobilizer system. The immobilizer system is designed to prevent unauthorized use of the vehicle by requiring a specific electronic code to be transmitted from the key fob to the vehicle's engine control module (ECM) before the engine can start. When the incorrect identifier is received, the vehicle may not start or may experience issues with starting and running.

OBDII Code B3902 2014 GMC Sierra - Incorrect Immobilizer Identifier Received
B3902 2014 GMC Sierra Code - Incorrect Immobilizer Identifier Received

Common Causes of B3902 2014 GMC Sierra

  1. Faulty key fob or key transponder
  2. ECM software glitch
  3. Wiring issues in the immobilizer system
  4. Faulty immobilizer control module
  5. Faulty antenna ring around the ignition switch

Symptoms of B3902 2014 GMC Sierra

  1. Engine cranks but does not start
  2. Engine starts but immediately stalls
  3. Immobilizer warning light on the dashboard
  4. Inability to lock or unlock the vehicle using the key fob
  5. Loss of power while driving

How to Fix B3902 2014 GMC Sierra

  1. Check the key fob and key transponder for any visible damage or malfunction. Replace if necessary.
  2. Perform a diagnostic scan of the ECM to identify any software glitches and reprogram as needed.
  3. Inspect the wiring in the immobilizer system for any loose connections or damage. Repair or replace as necessary.
  4. Test the immobilizer control module and antenna ring for proper functionality. Replace if faulty.
  5. Clear the diagnostic trouble codes from the vehicle's memory and reset the immobilizer system.

Cost to Fix B3902 2014 GMC Sierra

The cost of repairing a B3902 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $200. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 2014 GMC Sierra Code

1. What are common symptoms of OBDII code B3902 on a 2014 GMC Sierra?

- Common symptoms include the engine not starting, the vehicle going into anti-theft mode, and the immobilizer system malfunctioning.

2. What does the OBDII code B3902 "Incorrect Immobilizer Identifier Received" mean for a 2014 GMC Sierra?

- This code indicates that the vehicle's immobilizer system has detected an incorrect identifier, leading to a security issue preventing the engine from starting.

3. What are possible causes of OBDII code B3902 on a 2014 GMC Sierra?

- Possible causes include a faulty immobilizer module, issues with the key fob or key transponder, a wiring problem in the immobilizer system, or a communication error between components.

4. How can I diagnose OBDII code B3902 on my 2014 GMC Sierra?

- Diagnosis typically involves using a professional diagnostic scanner to read the code, checking for related trouble codes, inspecting the immobilizer system components, and testing the key fob or transponder.

5. Can OBDII code B3902 on a 2014 GMC Sierra be repaired at home?

- Repairing this code may require specialized tools and knowledge, so it is recommended to consult with a professional mechanic or dealership to accurately diagnose and fix the issue.

6. Are there any temporary solutions to try if I encounter OBDII code B3902 while driving my 2014 GMC Sierra?

- Attempting to disconnect and reconnect the vehicle's battery may reset the immobilizer system temporarily, but it is crucial to address the underlying cause of the code to prevent recurring issues.

7. How much does it typically cost to repair OBDII code B3902 on a 2014 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the immobilizer module, key fob, or addressing wiring problems, which can range from a few hundred to over a thousand dollars.

8. Can OBDII code B3902 on a 2014 GMC Sierra cause any long-term damage if left unrepaired?

- Ignoring this code may lead to continued issues with the vehicle's immobilizer system, potential security risks, and the inconvenience of not being able to start the engine reliably.

9. Is it safe to drive my 2014 GMC Sierra with OBDII code B3902 present?

- It is not recommended to drive the vehicle with this code active, as it may result in the engine not starting unexpectedly, potentially leaving you stranded.

10. How can I prevent OBDII code B3902 from occurring on my 2014 GMC Sierra in the future?

- Regular maintenance of the immobilizer system, ensuring proper key fob function, and promptly addressing any warning signs can help prevent the recurrence of this code.

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