AutoCodes – Buick – U18C4 Buick

U18C4 Buick Code - Lost Communication With Video Processing Control Module On Low Speed CAN Bus

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Video Processing Control Module, Video Processing Control Module harness is open or shorted, Video Processing 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: U18C4 Buick indicates Lost Communication With Video Processing Control Module On Low Speed CAN Bus.
Common causes: Common causes include Faulty Video Processing Control Module, Video Processing Control Module harness is open or shorted, Video Processing 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 453

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U18C4 Buick Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18C4 Buick - Lost Communication With Video Processing Control Module On Low Speed CAN Bus - AutoCodes.com — U18C4 Buick Code - Lost Communication With Video Processing Control Module On Low Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18C4 Buick?

Faulty Video Processing Control Module
Video Processing Control Module harness is open or shorted
Video Processing Control Module circuit poor electrical connection

How to Fix the DTC U18C4 Buick?

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 U18C4 Buick 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 U18C4 Buick code?

Need more information on how to fix the U18C4 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U18C4 Buick 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 U18C4 Buick Code

1. What are common symptoms of OBDII code U18C4 in a Buick related to lost communication with the Video Processing Control Module on the Low Speed CAN Bus?

- Common symptoms include loss of video display on the infotainment system, malfunctioning rearview camera, and issues with other multimedia features.

2. What are some possible causes of the U18C4 OBDII code in a Buick?

- Possible causes include a faulty Video Processing Control Module, damaged wiring or connectors in the Low Speed CAN Bus circuit, or a software glitch in the multimedia system.

3. How can I diagnose the U18C4 code in my Buick?

- Diagnosing the U18C4 code may involve using a professional OBDII scanner to retrieve the fault codes, checking the wiring and connectors for any damage, and performing a software update on the multimedia system if necessary.

4. Can I still drive my Buick with the U18C4 code present?

- It is generally safe to drive the vehicle with the U18C4 code, but it is recommended to address the issue promptly to ensure proper functionality of the multimedia system and related safety features.

5. How can I repair the U18C4 OBDII code in my Buick?

- Repairing the U18C4 code may involve replacing the Video Processing Control Module, repairing or replacing damaged wiring and connectors, or updating the software in the multimedia system.

6. Is it possible to reset the U18C4 code in my Buick without fixing the underlying issue?

- While you can clear the code temporarily, it is important to address the root cause of the problem to prevent the code from reoccurring.

7. Are there any preventative measures to avoid the U18C4 code in my Buick?

- To prevent the U18C4 code, it is recommended to perform regular maintenance checks on the multimedia system, including checking the wiring and connectors for any signs of damage.

8. How much does it typically cost to repair the U18C4 code in a Buick?

- The cost of repairing the U18C4 code can vary depending on the specific issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can a DIY enthusiast fix the U18C4 code in a Buick?

- While some basic troubleshooting and repairs can be done by a DIY enthusiast, diagnosing and repairing complex electrical issues like the U18C4 code may require professional expertise and specialized tools.

10. How long does it usually take to repair the U18C4 code in a Buick?

- The repair time for the U18C4 code can vary depending on the specific problem, but it may take a few hours to a day to diagnose and fix the issue, especially if software updates or module replacements are required.