AutoCodes – Chevrolet – B3978 Chevrolet

B3978 Chevrolet 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: B3978 Chevrolet 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 8,108

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 19, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3978 Chevrolet 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 (EBCM), 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.

OBDII Code B3978 Chevrolet - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module - AutoCodes.com — B3978 Chevrolet Code - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module

What does this mean?

What are the Possible Causes of the DTC B3978 Chevrolet?

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 B3978 Chevrolet?

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 B3978 Chevrolet 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.

Need more information about the B3978 Chevrolet code?

Need more information on how to fix the B3978 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3978 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B3978 2014 Chevrolet Silverado — Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module
B3978 2015 Chevrolet Silverado — Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module
B3978 2016 Chevrolet Silverado — Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module
B3978 2017 Chevrolet Silverado — Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module
B3978 2018 Chevrolet Silverado — 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 B3978 Chevrolet Code

1. What are the common symptoms of OBDII code B3978 Chevrolet?

The common symptoms of code B3978 include the airbag warning light illuminating on the dashboard and the possibility of the airbags not deploying properly in the event of a crash.

2. What can cause the OBDII code B3978 to be triggered in a Chevrolet vehicle?

The code B3978 is typically triggered when the Inflatable Restraint Sensing and Diagnostic Module (SDM) receives an incorrect environmental identifier, which could be due to a faulty SDM, wiring issues, or environmental factors affecting sensor readings.

3. How serious is the OBDII code B3978 in a Chevrolet vehicle?

Code B3978 is a serious issue as it relates to the proper functioning of the airbag system. It is crucial to address this code promptly to ensure the safety features of the vehicle are working correctly.

4. What should I do if my Chevrolet vehicle displays the OBDII code B3978?

If your Chevrolet displays code B3978, it is recommended to have the vehicle inspected by a qualified mechanic or dealership to diagnose the specific cause of the issue. Ignoring this code can compromise the safety of the vehicle.

5. Can I repair the OBDII code B3978 Chevrolet issue myself?

Repairing the OBDII code B3978 often requires specialized tools and knowledge of airbag systems. It is best to have a professional technician handle the diagnosis and repair to ensure the issue is resolved correctly.

6. Are there any specific diagnostic steps to follow for OBDII code B3978 in a Chevrolet vehicle?

Diagnosing code B3978 may involve checking the wiring connections to the SDM, inspecting for any environmental factors affecting sensor readings, and conducting a thorough scan of the airbag system for any related trouble codes.

7. How much does it typically cost to repair OBDII code B3978 in a Chevrolet vehicle?

The cost of repairing code B3978 can vary depending on the underlying cause of the issue and the specific repairs needed. It is advisable to get a professional diagnosis to determine the exact cost of the repair.

8. Can driving with the OBDII code B3978 present cause any further damage to the vehicle?

Continuing to drive with code B3978 present may pose a risk in the event of a collision, as the airbags may not deploy properly. It is best to address this issue promptly to ensure the safety of the vehicle occupants.

9. Is it safe to reset the OBDII code B3978 without addressing the underlying problem?

Resetting the code without addressing the underlying issue will not resolve the problem causing the code to trigger. It is important to diagnose and repair the root cause to ensure the safety systems are functioning correctly.

10. How long does it typically take to repair the OBDII code B3978 in a Chevrolet vehicle?

The repair time for code B3978 can vary based on the specific cause of the issue and the complexity of the repair needed. It is advisable to consult with a professional technician for an accurate estimate of the repair timeframe.