AutoCodes – GMC – U18BF 2015 GMC Sierra

U18BF 2015 GMC Sierra Code - Secondary High Speed CAN Bus Subnet Configuration List

Quick Answer

The devices on the high-speed General Motor Local Area Network (GMLAN) serial data bus and the chassis high-speed GMLAN serial data bus must be programmed with software that specifically identifies the correct type and quantity of devices on the bus based on RPO configuration. Common causes include Faulty Module that is not configured, Module harness is open or shorted, 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: U18BF 2015 GMC Sierra indicates Secondary High Speed CAN Bus Subnet Configuration List.
Common causes: Common causes include Faulty Module that is not configured, Module harness is open or shorted, 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 222

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 Jul 24, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U18BF 2015 GMC Sierra Description

The devices on the high-speed General Motor Local Area Network (GMLAN) serial data bus and the chassis high-speed GMLAN serial data bus must be programmed with software that specifically identifies the correct type and quantity of devices on the bus based on RPO configuration. If a device was not properly configured after installation, the appropriate U Code may be set for that device. No external circuit diagnosis is involved. The Diagnostic Trouble Code (DTC) will set when the device is not configured properly, or the device recognizes a programming error.

OBDII Code U18BF 2015 GMC Sierra - Secondary High Speed CAN Bus Subnet Configuration List - AutoCodes.com — U18BF 2015 GMC Sierra Code - Secondary High Speed CAN Bus Subnet Configuration List

What does this mean?

What are the Possible Causes of the DTC U18BF 2015 GMC Sierra?

Faulty Module that is not configured
Module harness is open or shorted
Module circuit poor electrical connection

How to Fix the DTC U18BF 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 U18BF 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 U18BF 2015 GMC Sierra code?

Need more information on how to fix the U18BF 2015 GMC Sierra code? Get Access to Factory Service Manuals

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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 U18BF 2015 GMC Sierra Code

1. What does the OBDII code U18BF for a 2015 GMC Sierra indicate?

The U18BF code specifically refers to issues with the Secondary High Speed CAN Bus Subnet Configuration List in the vehicle.

2. What are some common symptoms of a U18BF code in a 2015 GMC Sierra?

Common symptoms may include communication errors between modules, intermittent or complete loss of certain functions, and warning lights on the dashboard.

3. What are possible causes of the U18BF code in a 2015 GMC Sierra?

Potential causes of the U18BF code can include faulty wiring or connectors, issues with the CAN bus network, software glitches, or problems with the control modules.

4. How can I diagnose the U18BF code in my 2015 GMC Sierra?

Diagnosing the U18BF code typically involves using a professional OBDII scanner to read the code, checking for related codes, inspecting wiring and connectors, and performing network communication tests.

5. Can I continue driving my 2015 GMC Sierra with a U18BF code?

It is not recommended to drive the vehicle with a U18BF code present, as it can lead to further electrical issues or malfunctions within the vehicle's systems.

6. How should I repair the U18BF code in my 2015 GMC Sierra?

Repairing the U18BF code may involve fixing any wiring or connector issues, updating software, replacing faulty control modules, or resetting the network configuration list.

7. Will resetting the U18BF code make it go away permanently?

Resetting the code may clear it temporarily, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

8. Can I fix a U18BF code in my 2015 GMC Sierra myself?

While some basic checks and repairs can be done by DIY enthusiasts, diagnosing and repairing complex electrical issues related to the U18BF code may require professional assistance.

9. Are there any recalls or technical service bulletins related to the U18BF code in a 2015 GMC Sierra?

Check with your local GMC dealership or online resources for any relevant recalls or technical service bulletins related to the U18BF code in your specific vehicle.

10. How much can I expect to pay to fix a U18BF code in my 2015 GMC Sierra?

The cost of repairing a U18BF code can vary depending on the root cause of the issue, the extent of repairs needed, and labor rates in your area. It is advisable to obtain estimates from qualified mechanics or service centers.