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Engine-Codes – GMC – B3924 2018 GMC Sierra

B3924 2018 GMC Sierra Code - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module

Quick Answer

The B3924 diagnostic trouble code for a 2018 GMC Sierra indicates that an incorrect environmental identifier was received from the Inflatable Restraint Sensing and Diagnostic Module (SDM). Common causes include Faulty environmental sensors providing inaccurate data to the SDM, Damaged wiring or connectors leading to poor communication with the SDM, Malfunctioning SDM unit. 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 2018 GMC Sierra indicates Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module.
Common causes
Common causes include Faulty environmental sensors providing inaccurate data to the SDM, Damaged wiring or connectors leading to poor communication with the SDM, Malfunctioning SDM unit.
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 10, 2024
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Code B3924 2018 GMC Sierra Description

The B3924 diagnostic trouble code for a 2018 GMC Sierra indicates that an incorrect environmental identifier was received from the Inflatable Restraint Sensing and Diagnostic Module (SDM). This module is a crucial component of the vehicle's airbag system, responsible for detecting and deploying airbags in the event of a crash. The environmental identifier refers to data that helps the SDM determine the severity of the impact and whether airbag deployment is necessary.

OBDII Code B3924 2018 GMC Sierra - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module
B3924 2018 GMC Sierra Code - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module

Common Causes of B3924 2018 GMC Sierra

  1. Faulty environmental sensors providing inaccurate data to the SDM
  2. Damaged wiring or connectors leading to poor communication with the SDM
  3. Malfunctioning SDM unit
  4. Water damage or corrosion affecting the airbag system components
  5. Previous collision or impact causing damage to the airbag system

Symptoms of B3924 2018 GMC Sierra

  1. Airbag warning light illuminated on the dashboard
  2. Inconsistent or erratic airbag deployment
  3. Loss of communication with the SDM
  4. Vehicle fails to pass airbag system diagnostics during inspection
  5. Stored fault codes related to the airbag system in the vehicle's computer

How to Fix B3924 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the airbag system components, including sensors, wiring, and the SDM unit.
  2. Use a diagnostic scanner to retrieve the specific fault codes and identify the exact cause of the issue.
  3. Replace any faulty sensors or wiring that may be contributing to the problem.
  4. If the SDM is found to be faulty, it may need to be reprogrammed or replaced with a new unit.
  5. Clear the fault codes from the vehicle's computer and perform a test to ensure that the airbag system is functioning properly.

Cost to Fix B3924 2018 GMC Sierra

The typical repair costs for addressing a B3924 code on a 2018 GMC Sierra can vary depending on the extent of the issue and the specific components that need to be replaced or repaired. In general, the cost of parts such as sensors, wiring, or a new SDM unit can range from $200 to $800 or more. Labor costs at an auto repair shop can add an additional $100 to $300 or more, depending on the shop's hourly rates and the complexity of the repair process.

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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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B3924 in a 2018 GMC Sierra?

The common symptoms of OBDII code B3924 in a 2018 GMC Sierra include the airbag warning light illuminating on the dashboard and potential issues with the vehicle's airbag system.

2. What does the OBDII code B3924 "Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module" indicate?

This code indicates a communication error between the inflatable restraint sensing and diagnostic module in the vehicle's airbag system.

3. What are possible causes of OBDII code B3924 in a 2018 GMC Sierra?

Possible causes of code B3924 in a 2018 GMC Sierra include a faulty inflatable restraint sensing and diagnostic module, wiring issues, or a poor connection in the airbag system.

4. How can I diagnose and repair OBDII code B3924 in my 2018 GMC Sierra?

Diagnosing and repairing code B3924 typically requires using a professional OBDII scanner to retrieve the specific details of the error and then inspecting the inflatable restraint sensing and diagnostic module, wiring, and connections for any faults.

5. Is it safe to drive my 2018 GMC Sierra with OBDII code B3924 present?

It is not recommended to drive your vehicle with code B3924 present, as it indicates a potential issue with the airbag system, which is a critical safety component of the vehicle.

6. Can I reset the OBDII code B3924 in my 2018 GMC Sierra on my own?

While you can clear the code temporarily with an OBDII scanner, it is essential to diagnose and repair the underlying issue causing the code to prevent it from reoccurring.

7. How much does it typically cost to repair OBDII code B3924 in a 2018 GMC Sierra?

The cost of repairing OBDII code B3924 in a 2018 GMC Sierra can vary depending on the specific cause of the issue, but it may involve replacing the inflatable restraint sensing and diagnostic module or addressing wiring problems.

8. Will fixing OBDII code B3924 in my 2018 GMC Sierra require a visit to a mechanic?

Due to the complexity of diagnosing and repairing issues related to the airbag system, it is recommended to have a professional mechanic or dealership service department address and resolve OBDII code B3924 in your 2018 GMC Sierra.

9. Can OBDII code B3924 cause the airbags not to deploy in an accident?

Code B3924 may indicate a problem with the airbag system's communication, which could potentially affect the deployment of the airbags in the event of an accident. It is crucial to address this code promptly to ensure the proper functioning of the airbag system.

10. Is OBDII code B3924 a common issue in 2018 GMC Sierra vehicles?

While OBDII code B3924 may not be a widespread issue, it is essential to address it promptly to ensure the safety and proper operation of the airbag system in your 2018 GMC Sierra.

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