AutoCodes – Chevrolet – U18B9 2014 Chevrolet Silverado

U18B9 2014 Chevrolet Silverado Code - Primary 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: U18B9 2014 Chevrolet Silverado indicates Primary 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 250

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 U18B9 2014 Chevrolet Silverado 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 U18B9 2014 Chevrolet Silverado - Primary High Speed CAN Bus Subnet Configuration List - AutoCodes.com — U18B9 2014 Chevrolet Silverado Code - Primary High Speed CAN Bus Subnet Configuration List

What does this mean?

What are the Possible Causes of the DTC U18B9 2014 Chevrolet Silverado?

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

How to Fix the DTC U18B9 2014 Chevrolet Silverado?

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 U18B9 2014 Chevrolet Silverado 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 U18B9 2014 Chevrolet Silverado code?

Need more information on how to fix the U18B9 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U18B9 2014 Chevrolet Silverado 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 U18B9 2014 Chevrolet Silverado Code

1. What does the OBDII code U18B9 on a 2014 Chevrolet Silverado indicate?

The code U18B9 signifies an issue with the Primary High Speed CAN Bus Subnet Configuration List on the vehicle.

2. What are the common symptoms of the U18B9 code in a 2014 Chevrolet Silverado?

Common symptoms may include intermittent or complete loss of communication with various control modules, malfunctioning of electronic systems, and warning lights on the dashboard.

3. What are the possible causes of the U18B9 code in a 2014 Chevrolet Silverado?

Potential causes of the U18B9 code include damaged wiring or connections in the CAN bus network, faulty control modules, water intrusion, or software issues.

4. How can I diagnose the U18B9 code on my 2014 Chevrolet Silverado?

Diagnosing the U18B9 code typically involves using a professional diagnostic scanner to access the vehicle's network and pinpoint the source of the communication fault.

5. Can I continue driving my 2014 Chevrolet Silverado with the U18B9 code present?

It is not recommended to drive the vehicle with the U18B9 code active, as it may lead to unpredictable behavior of electronic systems and potentially compromise safety.

6. How can I repair the U18B9 code on my 2014 Chevrolet Silverado?

Repairing the U18B9 code may involve inspecting and repairing damaged wiring, ensuring proper connections, replacing faulty control modules, and updating software as needed.

7. Will resetting the U18B9 code make it go away permanently?

Simply clearing the code without addressing the underlying issue will not resolve the problem permanently. It is essential to diagnose and repair the root cause of the U18B9 code.

8. Can a DIY enthusiast fix the U18B9 code on a 2014 Chevrolet Silverado?

While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing complex communication network issues like the U18B9 code may require professional assistance.

9. How much does it cost to fix the U18B9 code on a 2014 Chevrolet Silverado?

The cost of fixing the U18B9 code can vary depending on the specific repairs needed, such as replacing components or addressing wiring issues. It is advisable to consult a professional for an accurate estimate.

10. Is the U18B9 code a common issue in 2014 Chevrolet Silverado vehicles?

The U18B9 code related to the Primary High Speed CAN Bus Subnet Configuration List is not extremely common, but it can occur due to various factors affecting the vehicle's communication network.