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B3924 2015 GMC Sierra Code - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module

Quick Answer

The B3924 diagnostic trouble code for a 2015 GMC Sierra indicates that an incorrect environmental identifier has been received from the Inflatable Restraint Sensing and Diagnostic Module (SDM). Common causes include Faulty Inflatable Restraint Sensing and Diagnostic Module, Wiring harness issues, such as shorts or open circuits, Sensor malfunction within the airbag 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
B3924 2015 GMC Sierra indicates Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module.
Common causes
Common causes include Faulty Inflatable Restraint Sensing and Diagnostic Module, Wiring harness issues, such as shorts or open circuits, Sensor malfunction within the airbag 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 15, 2024
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Code B3924 2015 GMC Sierra Description

The B3924 diagnostic trouble code for a 2015 GMC Sierra indicates that an incorrect environmental identifier has been received from the Inflatable Restraint Sensing and Diagnostic Module (SDM). The SDM is a crucial component of the vehicle's airbag system, responsible for detecting impacts and deploying airbags in the event of a collision. The environmental identifier is a signal that helps the SDM determine the severity of an impact and deploy the appropriate level of protection.

OBDII Code B3924 2015 GMC Sierra - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module
B3924 2015 GMC Sierra Code - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module

Common Causes of B3924 2015 GMC Sierra

  1. Faulty Inflatable Restraint Sensing and Diagnostic Module
  2. Wiring harness issues, such as shorts or open circuits
  3. Sensor malfunction within the airbag system
  4. Communication error between the SDM and other modules
  5. Software glitch or programming error in the SDM

Symptoms of B3924 2015 GMC Sierra

  1. Airbag warning light illuminated on the dashboard
  2. Inconsistent or erratic airbag deployment
  3. Intermittent loss of communication with the SDM
  4. Vehicle failing airbag system self-test during startup
  5. Stored fault codes related to the airbag system in the vehicle's computer

How to Fix B3924 2015 GMC Sierra

  1. Begin by conducting a thorough inspection of the airbag system, including the SDM, wiring, and sensors, to identify any visible damage or issues.
  2. Use a diagnostic scan tool to retrieve the specific fault codes stored in the vehicle's computer related to the airbag system.
  3. Address any wiring issues, such as repairing damaged wires or connectors, to ensure proper communication between components.
  4. If the SDM is determined to be faulty, it may need to be replaced with a new unit and reprogrammed to match the vehicle's specifications.
  5. After completing the repair, clear the fault codes from the vehicle's computer and perform a comprehensive test of the airbag system to ensure proper functionality.

Cost to Fix B3924 2015 GMC Sierra

The typical repair costs for addressing the B3924 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing the Inflatable Restraint Sensing and Diagnostic Module and addressing any related wiring or sensor issues can range from $300 to $800, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary significantly, so it's advisable to obtain a personalized estimate based on the vehicle's condition and location. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops may offer more competitive pricing.

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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 B3924 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B3924 in a 2015 GMC Sierra?

- The common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the vehicle's airbag system.

2. What does OBDII code B3924 indicate in a 2015 GMC Sierra?

- OBDII code B3924 indicates that the Inflatable Restraint Sensing and Diagnostic Module has received an incorrect environmental identifier.

3. What are the possible causes of OBDII code B3924 in a 2015 GMC Sierra?

- Possible causes of this code include a malfunction in the sensing and diagnostic module, wiring issues, a faulty airbag system component, or a communication error.

4. How can I diagnose OBDII code B3924 in my 2015 GMC Sierra?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific error code, checking the wiring connections, inspecting the airbag system components, and testing the sensing module.

5. Can OBDII code B3924 be repaired at home?

- Repairing OBDII code B3924 may require advanced diagnostic tools and expertise, so it is recommended to consult a professional mechanic for repairs to ensure proper diagnosis and resolution.

6. Is it safe to drive my 2015 GMC Sierra with OBDII code B3924?

- It is not advisable to drive the vehicle with an active airbag system fault code. It is important to address the issue promptly to ensure the proper functioning of the airbag system in case of an accident.

7. How much does it typically cost to repair OBDII code B3924 in a 2015 GMC Sierra?

- The cost of repairing OBDII code B3924 can vary depending on the specific cause of the issue, the needed repairs or replacements, and labor costs. It is recommended to obtain quotes from automotive professionals.

8. Can resetting the OBDII code B3924 in a 2015 GMC Sierra fix the issue?

- Resetting the code may temporarily turn off the warning light, but it will not address the underlying problem causing the code. It is essential to diagnose and repair the root cause of the issue.

9. How long does it take to repair OBDII code B3924 in a 2015 GMC Sierra?

- The repair time for this code can vary depending on the complexity of the issue and the availability of parts. Some repairs may be completed within a few hours, while others may take longer.

10. Is OBDII code B3924 a common issue in 2015 GMC Sierra vehicles?

- While not extremely common, OBDII code B3924 can occur in 2015 GMC Sierra vehicles due to various factors, and it is important to address it promptly to ensure the safety of the airbag system.

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