AutoCodes – Chevrolet – B3978 2014 Chevrolet Silverado

B3978 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado 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 405

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 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module - AutoCodes.com — B3978 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado code?

Need more information on how to fix the B3978 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2014 Chevrolet Silverado Code

1. What does the OBDII code B3978 mean on a 2014 Chevrolet Silverado?

Code B3978 indicates that the Inflatable Restraint Sensing and Diagnostic Module (SDM) has received an incorrect environmental identifier, which could affect the airbag system's functionality.

2. What are the common symptoms of code B3978 in a 2014 Chevrolet Silverado?

Common symptoms include the airbag warning light staying on, potential deactivation of the airbag system, and stored fault codes in the vehicle's computer.

3. What causes the B3978 code to appear on a 2014 Chevrolet Silverado?

This code is typically caused by incorrect programming, a communication error between the SDM and other modules, or a faulty SDM.

4. Is it safe to drive a 2014 Chevrolet Silverado with the B3978 code?

It is not recommended to drive with this code active, as it may impair the functionality of the airbag system, potentially compromising occupant safety in an accident.

5. How can I diagnose the B3978 code on my 2014 Chevrolet Silverado?

Diagnosis involves scanning for fault codes, inspecting the SDM and associated wiring, and verifying module programming and communication.

6. Can a software update fix the B3978 code on a 2014 Chevrolet Silverado?

Yes, in some cases, reprogramming or updating the software for the SDM or related modules can resolve the issue.

7. What tools are needed to troubleshoot the B3978 code?

You will need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter for testing wiring, and possibly access to GM's programming tools.

8. How much does it cost to repair the B3978 code on a 2014 Chevrolet Silverado?

Repair costs vary depending on the issue but can range from $100 for reprogramming to several hundred dollars if the SDM needs replacement.

9. Can I clear the B3978 code without fixing the problem?

Clearing the code without addressing the root cause is not recommended, as the issue will likely recur and may leave the airbag system inoperable.

10. Should I take my 2014 Chevrolet Silverado to a dealer for the B3978 code?

If you lack the tools or expertise to diagnose and repair airbag system issues, itâ€™s best to take the vehicle to a GM-certified dealer or qualified mechanic.