U18BF 2016 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 2016 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 2016 GMC Sierra Description
What are the Possible Causes of the DTC U18BF 2016 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 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 U18BF 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 U18BF 2016 GMC Sierra code?
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Frequently Asked Questions about U18BF 2016 GMC Sierra Code
What does the OBDII code U18BF mean on a 2016 GMC Sierra?
The code U18BF indicates an issue with the Secondary High-Speed CAN Bus Subnet Configuration List, meaning there is a communication problem between control modules on the secondary CAN bus.
What are the common symptoms of the U18BF code?
Common symptoms include warning lights on the dashboard (such as the check engine light), loss of communication with certain vehicle modules, or erratic behavior of electronic systems.
What causes the U18BF code to appear?
The U18BF code can be caused by faulty wiring, damaged connectors, a malfunctioning control module, or software configuration issues on the secondary CAN bus.
Can a loose connection trigger the U18BF code?
Yes, loose or damaged connections in the wiring harness or at module connectors can disrupt communication and trigger this code.
How is the U18BF code diagnosed?
A mechanic will use a scan tool to check for related codes, inspect the wiring and connectors on the secondary CAN bus, and test the functionality of the affected modules.
Can the U18BF code affect vehicle performance?
While it typically affects electronic systems, it can indirectly impact performance if critical systems like the transmission or engine control modules lose communication.
Is the U18BF code specific to the 2016 GMC Sierra?
The code U18BF is not specific to the Sierra but is more common in General Motors vehicles that use secondary high-speed CAN bus systems.
Can reprogramming the control modules fix the U18BF code?
Yes, reprogramming or updating the software for the affected modules may resolve the issue if it’s caused by a configuration error.
Is the U18BF code safe to ignore?
No, ignoring the U18BF code can lead to further communication issues and potentially affect the operation of critical vehicle systems.
What should I check first when troubleshooting the U18BF code?
Start by inspecting the wiring and connectors on the secondary CAN bus for damage, corrosion, or loose connections.
Discuss the causes and fixes for U18BF 2016 GMC Sierra OBDII Code
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