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Engine-Codes – Generic – B3902

B3902 Code - Incorrect Immobilizer Identifier Received

Quick Answer

The B3902 diagnostic trouble code (DTC) refers to an "Incorrect Immobilizer Identifier Received." In modern vehicles, an immobilizer system is designed to prevent the engine from starting without the correct key or key fob. 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 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 09, 2024
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Code B3902 Description

The B3902 diagnostic trouble code (DTC) refers to an "Incorrect Immobilizer Identifier Received." In modern vehicles, an immobilizer system is designed to prevent the engine from starting without the correct key or key fob. The immobilizer system communicates with the engine control module (ECM) to ensure that the vehicle can only be started with the correct key. When the ECM receives an incorrect identifier from the immobilizer system, it triggers the B3902 code, indicating a problem with the immobilizer system.

OBDII Code B3902 - Incorrect Immobilizer Identifier Received
B3902 Code - Incorrect Immobilizer Identifier Received

Common Causes of B3902

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

Symptoms of B3902

  1. Engine cranks but does not start
  2. Vehicle stalls unexpectedly
  3. Reduced engine power
  4. Vehicle immobilized and unable to start
  5. Security light flashing on the dashboard

How to Fix B3902

  1. Check the key or key fob for any damage or malfunction. Replace if necessary.
  2. Inspect the immobilizer system for any faults or malfunctions. Repair or replace components as needed.
  3. Verify the communication between the ECM and immobilizer system. Repair any wiring or connection issues.
  4. Clear the DTC using a diagnostic scanner and reprogram the immobilizer system if required.
  5. Test the vehicle to ensure the issue is resolved and the engine starts properly.

Cost to Fix B3902

The typical repair costs for resolving the B3902 code can vary depending on the specific cause of the issue. In general, the cost of repairing an incorrect immobilizer identifier received can range from $150 to $500, including parts and labor. However, it is essential to note that 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 is advisable to check with local repair shops for a more accurate estimate.

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Code B3902 Information for Specific Makes

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 Code

1. What are the common symptoms of OBDII code B3902?

The common symptoms of OBDII code B3902, "Incorrect Immobilizer Identifier Received," include the inability to start the vehicle, flashing immobilizer light on the dashboard, and the engine stalling while driving.

2. What are the possible causes of OBDII code B3902?

Possible causes of OBDII code B3902 include a faulty immobilizer system, issues with the key fob or key programming, wiring problems in the immobilizer system, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose OBDII code B3902?

Diagnosing OBDII code B3902 involves using a diagnostic scanner to retrieve the trouble codes, checking the immobilizer system for any faults, inspecting the key fob and key programming, and testing the wiring and connections related to the immobilizer system.

4. Can I drive my vehicle with OBDII code B3902?

It is not recommended to drive your vehicle with OBDII code B3902, as it can lead to potential starting or stalling issues while driving, which may compromise your safety on the road.

5. How can I repair OBDII code B3902?

Repairing OBDII code B3902 may involve reprogramming the key fob, resetting the immobilizer system, repairing any wiring issues, or replacing faulty components in the immobilizer system as needed.

6. Will OBDII code B3902 cause permanent damage to my vehicle?

OBDII code B3902 itself may not cause permanent damage to your vehicle, but ignoring the issue can lead to starting or stalling problems, which may result in additional damage or safety risks.

7. Can I reset OBDII code B3902 on my own?

Resetting OBDII code B3902 may be possible by using a diagnostic scanner to clear the trouble codes after addressing the underlying issue with the immobilizer system or related components.

8. How much does it cost to fix OBDII code B3902?

The cost to fix OBDII code B3902 can vary depending on the root cause of the issue, the required repairs or replacements, and the labor costs involved. It is recommended to consult a professional mechanic for an accurate estimate.

9. Is OBDII code B3902 a common issue in certain vehicle models?

OBDII code B3902, "Incorrect Immobilizer Identifier Received," can be more common in vehicles equipped with advanced immobilizer systems or in models with known immobilizer-related issues. It is advisable to check for any manufacturer recalls or technical service bulletins related to this code.

10. How can I prevent OBDII code B3902 from occurring in the future?

To prevent OBDII code B3902 from occurring in the future, ensure that your key fob is in good condition, follow proper key programming procedures, regularly inspect the immobilizer system for any faults, and address any warning signs promptly to avoid potential starting or stalling issues.

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