AutoCodes – GMC – B3981 2014 GMC Sierra

B3981 2014 GMC Sierra Code - Incorrect Environmental Identifier Received from Electronic Brake Control 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 Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control 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: B3981 2014 GMC Sierra indicates Incorrect Environmental Identifier Received from Electronic Brake Control Module.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control 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 356

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 B3981 2014 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 B3981 2014 GMC Sierra - Incorrect Environmental Identifier Received from Electronic Brake Control Module - AutoCodes.com — B3981 2014 GMC Sierra Code - Incorrect Environmental Identifier Received from Electronic Brake Control Module

What does this mean?

What are the Possible Causes of the DTC B3981 2014 GMC Sierra?

Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module harness is open or shorted
Electronic Brake Control Module circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3981 2014 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 B3981 2014 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 B3981 2014 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 B3981 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code B3981 in a 2014 GMC Sierra?

The common symptoms include the check engine light illuminating, ABS warning light appearing on the dashboard, and potential issues with the vehicle's braking system.

2. What does the OBDII code B3981 mean for a 2014 GMC Sierra?

OBDII code B3981 indicates that the Engine Control Module (ECM) has received an incorrect environmental identifier from the Electronic Brake Control Module (EBCM).

3. What are possible causes of OBDII code B3981 in a 2014 GMC Sierra?

Possible causes of this code include a faulty EBCM, wiring issues between the ECM and EBCM, or a software malfunction within the brake control system.

4. How can I diagnose OBDII code B3981 in my 2014 GMC Sierra?

Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault codes, checking the wiring connections between the ECM and EBCM, and performing a thorough inspection of the brake control system.

5. Can I continue driving my 2014 GMC Sierra with OBDII code B3981?

It is not recommended to continue driving the vehicle with this code present, as it can affect the proper functioning of the braking system and compromise overall safety.

6. How can I repair OBDII code B3981 in my 2014 GMC Sierra?

Repairing this code may involve replacing the Electronic Brake Control Module, repairing any damaged wiring connections, or updating the software in the brake control system.

7. Is OBDII code B3981 a serious issue in a 2014 GMC Sierra?

Yes, this code should be addressed promptly to ensure the proper functioning of the vehicle's braking system and to prevent potential safety hazards.

8. Can a DIY enthusiast fix OBDII code B3981 in a 2014 GMC Sierra?

While some simple tasks like checking wiring connections can be done by a DIY enthusiast, diagnosing and repairing issues related to the EBCM may require professional expertise.

9. How much does it cost to repair OBDII code B3981 in a 2014 GMC Sierra?

The cost of repairing this code can vary depending on the exact cause of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services.

10. How often does OBDII code B3981 occur in a 2014 GMC Sierra?

The occurrence of this code can vary and is influenced by factors such as vehicle usage, maintenance history, and overall condition of the braking system.