AutoCodes – GMC – B3978 2016 GMC Sierra

B3978 2016 GMC Sierra 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 2016 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, 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 224

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 2016 GMC Sierra 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 2016 GMC Sierra - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module - AutoCodes.com — B3978 2016 GMC Sierra 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 2016 GMC Sierra?

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 2016 GMC Sierra?

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 2016 GMC Sierra 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 2016 GMC Sierra code?

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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 B3978 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B3978 in a 2016 GMC Sierra?

The common symptoms include the airbag warning light illuminating on the dashboard, potential loss of airbag deployment functionality, and a stored diagnostic trouble code for "Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module."

2. What could cause the OBDII code B3978 to trigger in a 2016 GMC Sierra?

The code B3978 is typically triggered when there is a communication error between the inflatable restraint sensing and diagnostic module and other related components due to wiring issues, module malfunctions, or faulty connections.

3. How serious is OBDII code B3978 in a 2016 GMC Sierra?

Code B3978 should be taken seriously as it relates to the proper functioning of the vehicle's airbag system. If this code is present, it indicates a potential issue that could compromise the safety of the vehicle occupants in the event of a collision.

4. What should I do if I encounter OBDII code B3978 in my 2016 GMC Sierra?

It is recommended to have the vehicle inspected by a qualified mechanic or dealership as soon as possible to diagnose the specific cause of the code. Ignoring this code could lead to airbag system failure in the event of an accident.

5. Can I continue driving my 2016 GMC Sierra with OBDII code B3978 present?

It is not advisable to continue driving the vehicle with the B3978 code present, as it indicates a potential issue with the airbag system. Continued driving without addressing the problem could pose a safety risk in the event of a collision.

6. How can I repair OBDII code B3978 in my 2016 GMC Sierra?

Repairing the B3978 code typically involves diagnosing the specific cause of the communication error and addressing any wiring issues, module malfunctions, or faulty connections. This may require professional diagnostic equipment and expertise.

7. Is it safe to reset the OBDII code B3978 in a 2016 GMC Sierra using a diagnostic tool?

While resetting the code may temporarily turn off the warning light, it is crucial to address the underlying issue causing the code to prevent potential safety risks. It is recommended to have the system properly diagnosed and repaired.

8. How much does it cost to fix OBDII code B3978 in a 2016 GMC Sierra?

The cost of fixing the B3978 code can vary depending on the specific cause of the issue, parts needed for repair, and labor charges. It is best to consult with a mechanic or dealership for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code B3978 in a 2016 GMC Sierra?

While some basic troubleshooting steps can be taken by DIY enthusiasts, diagnosing and repairing the B3978 code may require specialized knowledge and equipment. It is recommended to seek professional help for accurate diagnosis and repair.

10. Will OBDII code B3978 in a 2016 GMC Sierra affect the vehicle's overall performance?

While the B3978 code is related to the airbag system and may not directly impact the vehicle's drivability, it is essential to address this issue promptly to ensure the proper functioning of the safety systems in the vehicle.