AutoCodes – Chevrolet – B3981 Chevrolet

B3981 Chevrolet 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 Chevrolet 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 8,216

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

What does this mean?

What are the Possible Causes of the DTC B3981 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

Need more information on how to fix the B3981 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3981 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B3981 2014 Chevrolet Silverado — Incorrect Environmental Identifier Received from Electronic Brake Control Module
B3981 2015 Chevrolet Silverado — Incorrect Environmental Identifier Received from Electronic Brake Control Module
B3981 2016 Chevrolet Silverado — Incorrect Environmental Identifier Received from Electronic Brake Control Module
B3981 2017 Chevrolet Silverado — Incorrect Environmental Identifier Received from Electronic Brake Control Module
B3981 2018 Chevrolet Silverado — 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 Chevrolet Code

1. What are the common symptoms of OBDII code B3981 in a Chevrolet related to the Electronic Brake Control Module (EBCM)?

- Common symptoms include the illumination of the ABS warning light on the dashboard, potential loss of ABS functionality, and possible issues with the vehicle's stability control system.

2. What are the potential causes of OBDII code B3981 in a Chevrolet?

- The code B3981 typically indicates a communication error between the Engine Control Module (ECM) and the Electronic Brake Control Module (EBCM). This error can be caused by wiring issues, a faulty EBCM, or a malfunctioning ECM.

3. How can I diagnose OBDII code B3981 in my Chevrolet?

- Diagnosis involves using a professional OBDII scanner to retrieve the code, checking the wiring connections between the ECM and EBCM, and conducting a thorough inspection of the EBCM for any signs of damage or malfunction.

4. Is it safe to drive my Chevrolet with OBDII code B3981 present?

- It is generally recommended not to drive the vehicle extensively with this code present, as it may affect the ABS system's functionality, potentially compromising the vehicle's safety in certain driving conditions.

5. Can I repair OBDII code B3981 in my Chevrolet myself?

- Depending on your level of automotive expertise, you may be able to address this issue yourself by checking and repairing any faulty wiring connections, or replacing the EBCM if necessary. However, it is always recommended to consult a professional mechanic for accurate diagnosis and repair.

6. Are there any temporary fixes for OBDII code B3981 in a Chevrolet?

- While there may be temporary resets or clearings of the code, it is crucial to address the underlying cause of the issue to prevent it from recurring. Temporary fixes may not resolve the communication error between the ECM and EBCM.

7. How much does it cost to repair OBDII code B3981 in a Chevrolet?

- The cost of repair can vary depending on the specific cause of the code. It may involve simple wiring repairs or require the replacement of the EBCM, which can range from a few hundred to over a thousand dollars, including parts and labor.

8. Will resetting the OBDII code B3981 in my Chevrolet make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to reappear once the ECM detects the communication error with the EBCM again.

9. Can OBDII code B3981 cause other problems in my Chevrolet if left unaddressed?

- Ignoring this code can potentially lead to further issues with the vehicle's ABS system, affecting its ability to provide proper braking control and stability assistance in certain driving conditions. It is essential to address the code promptly to ensure safe operation of the vehicle.

10. Is OBDII code B3981 specific to Chevrolet vehicles, or can it occur in other makes and models?

- While the specific code B3981 may be unique to Chevrolet vehicles, similar communication errors between the ECM and EBCM can occur in other makes and models, resulting in related ABS and stability control issues.