AutoCodes – GMC – B3981 2015 GMC Sierra

B3981 2015 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 2015 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 238

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 2015 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 2015 GMC Sierra - Incorrect Environmental Identifier Received from Electronic Brake Control Module - AutoCodes.com — B3981 2015 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 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B3981 in a 2015 GMC Sierra?

- Common symptoms include the illumination of the "Service Electronic Brake Control System" warning light on the dashboard.

2. What does the OBDII code B3981 in a 2015 GMC Sierra mean?

- This code indicates that the electronic brake control module has detected an incorrect environmental identifier.

3. What are the possible causes of OBDII code B3981 in a 2015 GMC Sierra?

- Possible causes include a malfunctioning electronic brake control module, faulty wiring connections, or issues with the environmental sensor.

4. How can I diagnose OBDII code B3981 in my 2015 GMC Sierra?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the wiring connections, and checking the functionality of the electronic brake control module.

5. Can I continue driving my 2015 GMC Sierra with OBDII code B3981?

- It is not recommended to continue driving the vehicle with this code present, as it may affect the proper functioning of the electronic brake system.

6. How can I repair OBDII code B3981 in my 2015 GMC Sierra?

- Repair may involve replacing the electronic brake control module, repairing any damaged wiring, or recalibrating the environmental sensor.

7. Is it possible to reset OBDII code B3981 in a 2015 GMC Sierra without repairs?

- While clearing the code may temporarily turn off the warning light, it is important to address the underlying issue to prevent further problems with the brake system.

8. Are there any recalls or technical service bulletins related to OBDII code B3981 in a 2015 GMC Sierra?

- It is advisable to check with a GMC dealership or online resources for any relevant recalls or technical service bulletins related to this specific OBDII code.

9. How much does it typically cost to repair OBDII code B3981 in a 2015 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may include parts and labor expenses for component replacement or repair.

10. Can a DIY enthusiast fix OBDII code B3981 in a 2015 GMC Sierra?

- While some basic diagnosis and repairs may be possible for experienced DIY enthusiasts, addressing this code may require specialized tools and expertise, so professional assistance is recommended.