B3902 2018 GMC Sierra Code - Incorrect Immobilizer Identifier Received
Quick Answer
The B3902 diagnostic trouble code for a 2018 GMC Sierra indicates that an incorrect immobilizer identifier was received. Common causes include Malfunctioning immobilizer module, Faulty engine control module (ECM), Damaged key or key fob. 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 GMC Sierra indicates Incorrect Immobilizer Identifier Received.
- Common causes
- Common causes include Malfunctioning immobilizer module, Faulty engine control module (ECM), Damaged key or key fob.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code B3902 2018 GMC Sierra Description
The B3902 diagnostic trouble code for a 2018 GMC Sierra indicates that an incorrect immobilizer identifier was received. The immobilizer system is designed to prevent the vehicle from being started without the proper key or key fob. When this code appears, it means that the engine control module (ECM) is not receiving the correct signal from the immobilizer system, which could potentially lead to the vehicle not starting or running erratically.
Common Causes of B3902 2018 GMC Sierra
- Malfunctioning immobilizer module
- Faulty engine control module (ECM)
- Damaged key or key fob
- Wiring issues in the immobilizer system
- Communication errors between the immobilizer system and ECM
Symptoms of B3902 2018 GMC Sierra
- Engine starting issues
- Vehicle stalling or shutting down unexpectedly
- Security light flashing on the dashboard
- Immobilizer system warning message displayed on the instrument cluster
How to Fix B3902 2018 GMC Sierra
- Begin by verifying the code using a diagnostic scan tool to confirm the issue.
- Check the key or key fob for any visible damage or signs of wear.
- Inspect the wiring in the immobilizer system for any loose connections or damage.
- Test the immobilizer module and ECM for proper functionality and communication.
- If necessary, reprogram the immobilizer system to ensure proper communication with the ECM.
Cost to Fix B3902 2018 GMC Sierra
The typical repair costs for addressing an incorrect immobilizer identifier received code can vary depending on the specific cause of the issue. On average, the cost of parts and labor for this repair could range from $200 to $500. It is important to note that the 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 recommended to check with local repair shops for a more accurate estimate.
Need more information about the B3902 2018 GMC Sierra code?
Need more information on how to fix the B3902 2018 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B3902 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B3902 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code B3902 on a 2018 GMC Sierra?
The common symptoms include difficulty starting the vehicle, the engine stalling, and the ignition system not recognizing the key.
2. What does the OBDII code B3902 "Incorrect Immobilizer Identifier Received" mean on a 2018 GMC Sierra?
This code indicates a communication error between the vehicle's immobilizer system and the ignition system, leading to a failure in recognizing the correct key.
3. What are possible causes of OBDII code B3902 on a 2018 GMC Sierra?
Possible causes include a faulty immobilizer module, issues with the key fob, wiring problems, or a malfunctioning ignition switch.
4. How can I diagnose the OBDII code B3902 on a 2018 GMC Sierra?
Diagnosis involves using a diagnostic scanner to retrieve the specific error code, checking the immobilizer system for faults, inspecting the key fob, and testing the wiring connections.
5. Can OBDII code B3902 be reset on a 2018 GMC Sierra?
Yes, the code can be reset using an OBDII scanner after the underlying issue has been identified and resolved.
6. Is it safe to continue driving with OBDII code B3902 illuminated on a 2018 GMC Sierra?
It is not recommended to continue driving with this code illuminated, as it may lead to potential starting or stalling issues while driving.
7. How much does it typically cost to repair OBDII code B3902 on a 2018 GMC Sierra?
The cost of repair can vary depending on the specific cause of the issue, but it may range from a few hundred to a thousand dollars, including parts and labor.
8. Can I fix OBDII code B3902 on a 2018 GMC Sierra myself?
If you have experience with automotive diagnostics and repair, you may be able to address the issue yourself by checking the key fob, inspecting wiring, or replacing the immobilizer module if necessary.
9. Are there any preventive measures to avoid OBDII code B3902 on a 2018 GMC Sierra?
Regularly maintaining the key fob, ensuring proper wiring connections, and promptly addressing any warning signs can help prevent issues leading to this error code.
10. Will OBDII code B3902 cause the vehicle to fail an emissions test?
The presence of this code may indicate an issue with the immobilizer system, which is not directly related to emissions control. However, it is advisable to address and resolve the problem before undergoing an emissions test to avoid potential complications.
Discuss the causes and fixes for B3902 2018 GMC Sierra OBDII Code
Code B3902 2018 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.