U18BF 2017 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 2017 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.
Code U18BF 2017 GMC Sierra Description
What are the Possible Causes of the DTC U18BF 2017 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 2017 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 2017 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 2017 GMC Sierra code?
Need more information on how to fix the U18BF 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
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Frequently Asked Questions about U18BF 2017 GMC Sierra Code
What does the OBDII code U18BF mean on a 2017 GMC Sierra?
The U18BF code indicates an issue with the Secondary High-Speed CAN Bus Subnet Configuration List, signifying a communication error between modules on the secondary CAN bus network.
What are the common symptoms of the U18BF code in a GMC Sierra?
Symptoms may include warning lights on the dashboard, loss of communication with certain modules, erratic vehicle performance, or non-functional systems like climate control or infotainment.
What causes the U18BF code to appear?
This code can be caused by faulty wiring, poor electrical connections, a malfunctioning control module, or software configuration issues in the secondary high-speed CAN bus network.
Can I still drive my 2017 GMC Sierra with the U18BF code?
While the truck may still be drivable, certain systems may not function properly. It’s important to address the issue promptly to avoid further complications.
How is the U18BF code diagnosed?
A technician will use a diagnostic scanner to check for codes, inspect wiring and connectors on the secondary CAN bus, and test the affected modules for proper operation.
What repairs are required to fix the U18BF code?
Repairs may include fixing damaged wiring, cleaning or replacing corroded connectors, reprogramming affected modules, or replacing a faulty control module.
Can a software update resolve the U18BF code?
Yes, in some cases, a software update from the manufacturer can resolve communication issues and clear the code.
How much does it cost to fix the U18BF code on a GMC Sierra?
Repair costs can vary widely depending on the root cause, ranging from $100 for minor wiring repairs to over $1,000 if a module replacement is required.
What tools are needed to troubleshoot the U18BF code?
Tools include a professional OBDII scanner, a digital multimeter, and wiring diagrams to test and diagnose the secondary CAN bus network.
Can I fix the U18BF code myself?
If you’re experienced with automotive electrical systems, you can attempt basic checks like inspecting wiring and connectors. For complex issues, professional assistance is recommended.
Discuss the causes and fixes for U18BF 2017 GMC Sierra OBDII Code
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