AutoCodes – GMC – B3981 GMC

B3981 GMC 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 GMC 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 1,993

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

What does this mean?

What are the Possible Causes of the DTC B3981 GMC?

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 GMC?

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 GMC 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.

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Information for Specific GMC Models

B3981 2014 GMC Sierra — Incorrect Environmental Identifier Received from Electronic Brake Control Module
B3981 2015 GMC Sierra — Incorrect Environmental Identifier Received from Electronic Brake Control Module
B3981 2016 GMC Sierra — Incorrect Environmental Identifier Received from Electronic Brake Control Module
B3981 2017 GMC Sierra — Incorrect Environmental Identifier Received from Electronic Brake Control Module
B3981 2018 GMC Sierra — Incorrect Environmental Identifier Received from Electronic Brake Control Module

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 GMC Code

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

The common symptoms of OBDII code B3981 "Incorrect Environmental Identifier Received from Electronic Brake Control Module" in a GMC vehicle may include the check engine light illuminating, traction control issues, ABS warning light coming on, and potential loss of stability control.

2. What can cause OBDII code B3981 to trigger in a GMC vehicle?

The triggering of OBDII code B3981 in a GMC vehicle is typically caused by a communication error between the electronic brake control module and other related control modules in the vehicle's network.

3. How serious is OBDII code B3981 in a GMC vehicle?

OBDII code B3981 in a GMC vehicle should be addressed promptly to ensure the proper functioning of the electronic brake control module and related safety systems. Ignoring this code may lead to potential safety hazards on the road.

4. Can I continue to drive my GMC vehicle with OBDII code B3981 present?

It is not recommended to continue driving your GMC vehicle with OBDII code B3981 present, as it may compromise the vehicle's stability control, traction control, and ABS systems. It is advisable to address the issue as soon as possible.

5. How can I diagnose and repair OBDII code B3981 in my GMC vehicle?

Diagnosing and repairing OBDII code B3981 in a GMC vehicle may involve inspecting the wiring, connectors, and communication lines between the electronic brake control module and other control modules. Performing a thorough diagnostic scan using a compatible OBDII scanner can help pinpoint the exact cause of the issue.

6. Is it possible to reset OBDII code B3981 in a GMC vehicle without addressing the underlying problem?

Resetting OBDII code B3981 in a GMC vehicle without addressing the underlying problem may temporarily turn off the warning lights, but the code is likely to reappear if the root cause of the issue is not resolved.

7. Can a DIY enthusiast tackle the repair of OBDII code B3981 in a GMC vehicle?

While some DIY enthusiasts with automotive repair experience may attempt to address OBDII code B3981 in a GMC vehicle, it is recommended to consult a professional mechanic or technician for an accurate diagnosis and proper repair to ensure safety and effectiveness.

8. How much does it typically cost to repair OBDII code B3981 in a GMC vehicle?

The cost of repairing OBDII code B3981 in a GMC vehicle can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from reputable repair shops for an accurate estimate.

9. Are there any preventive maintenance tips to avoid OBDII code B3981 in a GMC vehicle?

To help prevent OBDII code B3981 in a GMC vehicle, it is recommended to maintain the vehicle's electrical system, perform regular inspections of wiring and connectors, and address any warning lights or unusual symptoms promptly to prevent potential communication errors.

10. Can OBDII code B3981 in a GMC vehicle affect fuel efficiency or engine performance?

While OBDII code B3981 is related to the electronic brake control module, it may indirectly impact fuel efficiency and engine performance if left unresolved, as it can affect the overall communication and control systems of the vehicle. Addressing the code promptly can help maintain optimal vehicle performance.