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Engine-Codes – GMC – B3902 2016 GMC Sierra

B3902 2016 GMC Sierra Code - Incorrect Immobilizer Identifier Received

Quick Answer

The B3902 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the vehicle's immobilizer system has detected an incorrect identifier. Common causes include Faulty key fob or key transponder, Malfunctioning immobilizer control module, 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 2016 GMC Sierra indicates Incorrect Immobilizer Identifier Received.
Common causes
Common causes include Faulty key fob or key transponder, Malfunctioning immobilizer control module, 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 14, 2024
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Code B3902 2016 GMC Sierra Description

The B3902 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the vehicle's immobilizer system has detected an incorrect identifier. The immobilizer system is a security feature that prevents the engine from starting unless the correct key or key fob is used. When the immobilizer system receives an incorrect identifier, it will prevent the engine from starting, effectively immobilizing the vehicle.

OBDII Code B3902 2016 GMC Sierra - Incorrect Immobilizer Identifier Received
B3902 2016 GMC Sierra Code - Incorrect Immobilizer Identifier Received

Common Causes of B3902 2016 GMC Sierra

  1. Faulty key fob or key transponder
  2. Malfunctioning immobilizer control module
  3. Wiring issues in the immobilizer system
  4. Low battery voltage affecting the immobilizer system
  5. Attempting to start the vehicle with an incorrect key

Symptoms of B3902 2016 GMC Sierra

  1. Engine cranks but does not start
  2. Immobilizer warning light illuminated on the dashboard
  3. Inability to start the engine with the correct key
  4. Vehicle goes into anti-theft mode

How to Fix B3902 2016 GMC Sierra

  1. Check the key fob and key transponder for proper functioning. Replace if necessary.
  2. Inspect the immobilizer control module for any faults or damage. Replace if needed.
  3. Check the wiring in the immobilizer system for any breaks or shorts. Repair or replace as required.
  4. Test the battery voltage and ensure it is within the proper range for the immobilizer system to function correctly.
  5. Clear the DTC from the vehicle's computer and reprogram the immobilizer system if necessary.

Cost to Fix B3902 2016 GMC Sierra

The typical repair costs for addressing the B3902 code on a 2016 GMC Sierra can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Most auto repair shops commonly charge between $80 and $150 per hour, but rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

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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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B3902 on a 2016 GMC Sierra?

- Common symptoms include the vehicle not starting, the engine cranking but not starting, and the security light staying on.

2. What causes the OBDII code B3902 on a 2016 GMC Sierra?

- The code B3902 is typically triggered when the immobilizer system fails to recognize the key, leading to an incorrect immobilizer identifier received by the system.

3. How can I diagnose the OBDII code B3902 on my 2016 GMC Sierra?

- Diagnosis involves checking the key fob battery, ensuring the key is programmed correctly, and inspecting the immobilizer system components for any issues.

4. Can a DIY enthusiast repair the OBDII code B3902 on a 2016 GMC Sierra?

- Repairing the code B3902 may require specialized tools and knowledge, so it's recommended to consult a professional mechanic or dealership for proper diagnosis and repair.

5. How much does it cost to fix the OBDII code B3902 on a 2016 GMC Sierra?

- The repair cost for code B3902 can vary depending on the exact cause of the issue, but it's advisable to budget for diagnostic fees, parts replacement, and labor costs.

6. Are there any temporary solutions to bypass the OBDII code B3902 on a 2016 GMC Sierra?

- Attempting to bypass or reset the immobilizer system without proper diagnosis and repair may lead to further complications, and it's not recommended as a temporary solution.

7. Can a dead key fob battery trigger the OBDII code B3902 on a 2016 GMC Sierra?

- Yes, a dead or low battery in the key fob can sometimes cause communication issues with the immobilizer system, leading to the code B3902 being triggered.

8. Is it safe to continue driving with the OBDII code B3902 present on a 2016 GMC Sierra?

- It is not recommended to drive the vehicle with the code B3902 present, as it may lead to potential starting or security issues that could affect the operation of the vehicle.

9. How long does it typically take to repair the OBDII code B3902 on a 2016 GMC Sierra?

- The repair time for code B3902 can vary depending on the exact cause of the issue and the availability of parts, but it's best to consult with a professional for an accurate estimate.

10. Will resetting the ECU clear the OBDII code B3902 on a 2016 GMC Sierra?

- Resetting the ECU may temporarily clear the code, but if the underlying issue with the immobilizer system is not addressed, the code is likely to reappear.

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