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B389A 2015 GMC Sierra Code - Environment Identification

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 Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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
B389A 2015 GMC Sierra indicates Environment Identification.
Common causes
Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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 230
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Jun 16, 2023
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Code B389A 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 modules between vehicles. The Body Control Module (BCM) is the keeper of the environment identifier. The instrument cluster, electronic brake control module, HVAC control module, inflatable restraint sensing and diagnostic module, Engine Control Module (ECM), and steering column lock module (if equipped) 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. The Diagnostic Trouble Code (DTC) sets when an incorrect immobilizer identifier was broadcast by the BCM.
OBDII Code B389A 2015 GMC Sierra - Environment Identification - AutoCodes.com
B389A 2015 GMC Sierra Code - Environment Identification
What does this mean?

What are the Possible Causes of the DTC B389A 2015 GMC Sierra?

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

How to Fix the DTC B389A 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 B389A 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 B389A 2015 GMC Sierra code?

Need more information on how to fix the B389A 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B389A 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 B389A 2015 GMC Sierra Code

1. What does the OBDII code B389A mean on a 2015 GMC Sierra?

The code B389A refers to "Environment Identification," which typically relates to a communication issue between vehicle modules.

2. What are common symptoms of code B389A in a 2015 GMC Sierra?

Symptoms may include malfunctioning electronics, warning lights on the dashboard, or intermittent issues with system communication.

3. What causes the B389A code on a GMC Sierra?

Common causes include wiring or connector issues, software glitches, or failure of a control module.

4. Can a faulty battery cause the B389A code?

Yes, a weak or failing battery can impact module communication and trigger this code.

5. How can I diagnose the B389A code on a 2015 GMC Sierra?

You can inspect wiring and connectors for damage, ensure the battery is fully charged, and use a diagnostic scan tool to check for related codes.

6. Is the B389A code serious enough to prevent driving?

While it typically doesn’t affect drivability, it can lead to erratic behavior in electronic systems and should be addressed promptly.

7. What repairs can fix the B389A code on a GMC Sierra?

Repairs may include fixing damaged wiring, cleaning or reconnecting connectors, updating software, or replacing a faulty module.

8. Can I clear the B389A code without fixing the issue?

Clearing the code without addressing the root cause may make it return and worsen system performance over time.

9. Does the B389A code require professional repair?

While basic checks can be done at home, complex issues like module replacement or reprogramming may require a professional.

10. How much does it cost to repair the B389A code on a GMC Sierra?

Costs vary depending on the issue. Wiring repairs may be inexpensive, but module replacement can be several hundred dollars.

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