AutoCodes – GMC – B389A 2016 GMC Sierra

B389A 2016 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 2016 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 158

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 16, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B389A 2016 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 2016 GMC Sierra - Environment Identification - AutoCodes.com — B389A 2016 GMC Sierra Code - Environment Identification

What does this mean?

What are the Possible Causes of the DTC B389A 2016 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 2016 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 2016 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 2016 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 B389A 2016 GMC Sierra Code

1. What does the OBDII code B389A mean on a 2016 GMC Sierra?

The code B389A indicates an issue with the Environment Identification system, which involves communication or sensor calibration used for vehicle functions.

2. What are common symptoms of the B389A code?

Symptoms may include a malfunctioning auxiliary system, warning lights on the dashboard, or reduced functionality of features like adaptive headlights or climate controls.

3. What causes the B389A code to appear?

This code is typically caused by faulty wiring, a damaged sensor, or a communication error between the vehicleâ€™s modules.

4. Can a weak battery trigger the B389A code?

Yes, a weak or failing battery can cause communication errors and potentially trigger this code.

5. How can I diagnose the B389A code?

Start by using a diagnostic scanner to confirm the code, then inspect wiring, connectors, and sensors related to the Environment Identification system.

6. What repairs are typically needed for the B389A code?

Repairs may include replacing damaged wiring, repairing faulty sensors, or updating the software in the affected control module.

7. Can I continue driving with the B389A code active?

While the vehicle may still be drivable, ignoring the code can lead to further issues with auxiliary systems or vehicle performance.

8. How much does it cost to fix the B389A code on a 2016 GMC Sierra?

Repair costs vary but may range from $100 to $500 depending on whether wiring, sensors, or module updates are required.

9. Is the B389A code covered under warranty for a 2016 GMC Sierra?

It depends on the warranty coverage; environmental system issues may be covered under certain powertrain or emissions warranties.

10. Can the B389A code be fixed without professional help?

If the issue is simple, such as loose wiring, it may be solvable at home. However, advanced diagnostics or module programming typically require professional assistance.