AutoCodes – Chevrolet – B3978 2015 Chevrolet Silverado

B3978 2015 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 2015 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 413

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 2015 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 2015 Chevrolet Silverado - Incorrect Environmental Identifier Received from Inflatable Restraint Sensing and Diagnostic Module - AutoCodes.com — B3978 2015 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 2015 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 2015 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 2015 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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado Code

1. What does OBDII code B3978 mean on a 2015 Chevrolet Silverado?

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

2. What are the symptoms of code B3978 in a 2015 Chevrolet Silverado?

Common symptoms include the airbag warning light illuminating on the dashboard and potential deactivation of the airbag system.

3. What causes the B3978 code to appear on a 2015 Silverado?

This code is often caused by communication errors between the SDM and other modules, incorrect programming, wiring issues, or a faulty SDM.

4. Is the vehicle safe to drive with a B3978 code?

The vehicle may still be drivable, but the airbag system may not function properly in a collision, posing a significant safety risk.

5. How do you diagnose the B3978 code on a 2015 Chevrolet Silverado?

Diagnosis typically involves using a scan tool to check for related codes, inspecting wiring and connectors, and verifying programming in the SDM and related modules.

6. Can a faulty clock spring cause the B3978 code?

No, a faulty clock spring is unlikely to cause this specific code. The issue is more related to communication or programming errors involving the SDM.

7. What repairs are needed to fix the B3978 code?

Repairs may include reprogramming or recalibrating the SDM, repairing or replacing faulty wiring or connectors, or replacing the SDM if itâ€™s determined to be defective.

8. Can disconnecting the battery reset a B3978 code?

Disconnecting the battery may temporarily clear the code, but it wonâ€™t address the underlying issue causing the error.

9. How much does it cost to fix a B3978 code?

Repair costs can vary widely, ranging from $100 for simple wiring repairs to over $500 if the SDM needs replacement or reprogramming.

10. Can I fix the B3978 code myself?

If you have experience with automotive diagnostics and access to a scan tool, you may be able to address basic wiring issues. However, SDM programming typically requires professional tools and expertise.