AutoCodes – Generic – B3924

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

Quick Answer

When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to the vehicle. Common causes include Faulty Inflatable Restraint Sensing and Diagnostic Module, Inflatable Restraint Sensing and Diagnostic Module harness is open or shorted, Inflatable Restraint Sensing and Diagnostic Module circuit poor electrical connection. 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 indicates Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module.
Common causes: Common causes include Faulty Inflatable Restraint Sensing and Diagnostic Module, Inflatable Restraint Sensing and Diagnostic Module harness is open or shorted, Inflatable Restraint Sensing and Diagnostic Module circuit poor electrical connection.
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.

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Code Popularity 4,127

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 16, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3924 Description

When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to the vehicle. The environment identifier is used to prevent the swapping of control modules between vehicles. The Body Control Module (BCM) is the keeper of the environment identifier. The instrument cluster, electronic brake control module, Heating, Ventilation, and Air Conditioning (HVAC) Control Module, inflatable restraint sensing and diagnostic module, and telematics communication interface control module each learn the environment identifier during their configuration process. During vehicle operation, the BCM sends the immobilizer identifier as a challenge and each module responds to the challenge by sending the environment identifier back to the BCM. If the BCM sends an incorrect immobilizer identifier or a specific number of incorrect environment identifiers are received, vehicle starting is disabled.
The Diagnostic Trouble Code (DTC) sets when the control module's environment identifier does not match the environment identifier stored by the BCM.

OBDII Code B3924 - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module - AutoCodes.com — B3924 Code - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module

What does this mean?

What are the Possible Causes of the DTC B3924?

Faulty Inflatable Restraint Sensing and Diagnostic Module
Inflatable Restraint Sensing and Diagnostic Module harness is open or shorted
Inflatable Restraint Sensing and Diagnostic Module circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3924?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3924 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need Help with the Code?

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Information for Specific Makes

B3924 Buick — Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module
B3924 Cadillac — Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module
B3924 Chevrolet — Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module
B3924 GMC — Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module

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 Code

1. What are the common symptoms of OBDII code B3924?

- The common symptoms of OBDII code B3924 include the airbag warning light illuminating on the dashboard and possible issues with the vehicle's airbag system.

2. What can cause OBDII code B3924 to trigger?

- OBDII code B3924, "Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module," can be triggered by a fault in the airbag system's sensing and diagnostic module.

3. How serious is OBDII code B3924?

- OBDII code B3924 indicates a potential issue with the airbag system, which is a critical safety component in a vehicle. It is recommended to address this code promptly to ensure the proper functioning of the airbags in case of an accident.

4. How can I diagnose OBDII code B3924?

- Diagnosing OBDII code B3924 requires using a professional OBDII scanner to retrieve the code and then further inspecting the airbag system for any visible damage or loose connections.

5. What are some repair tips for fixing OBDII code B3924?

- Repairing OBDII code B3924 may involve checking and repairing any damaged wiring or connections in the airbag system, resetting the airbag module, or replacing faulty components as needed.

6. Can I reset OBDII code B3924 on my own?

- While you can attempt to clear the code using an OBDII scanner, it is essential to diagnose the root cause of the issue and address it to prevent the code from reoccurring.

7. Is it safe to drive with OBDII code B3924 present?

- It is not recommended to drive with OBDII code B3924 present as it indicates a potential problem with the airbag system, which could compromise your safety in the event of a collision.

8. How much does it cost to repair OBDII code B3924?

- The cost of repairing OBDII code B3924 can vary depending on the exact cause of the issue and the necessary repairs. It is advisable to consult a professional mechanic for an accurate estimate.

9. Will OBDII code B3924 cause my vehicle to fail an emissions test?

- OBDII code B3924 is related to the airbag system and does not directly affect emissions. However, it is still important to address the code to ensure the overall safety and functionality of the vehicle.

10. Can OBDII code B3924 be intermittent?

- Yes, OBDII code B3924 can be intermittent, especially if the issue is related to loose connections or intermittent faults in the airbag system. It is crucial to address the problem to prevent potential safety risks.