AutoCodes – GMC – U18C3 GMC

U18C3 GMC Code - Lost Communication With Video Processing Control Module On High 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: U18C3 GMC indicates Lost Communication With Video Processing Control Module On High 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.

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Code Popularity 517

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
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Code U18C3 GMC 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 U18C3 GMC - Lost Communication With Video Processing Control Module On High Speed CAN Bus - AutoCodes.com — U18C3 GMC Code - Lost Communication With Video Processing Control Module On High Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18C3 GMC?

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 U18C3 GMC?

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 U18C3 GMC 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 U18C3 GMC code?

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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 U18C3 GMC Code

1. What are the common symptoms of OBDII code U18C3 GMC?

- Common symptoms include issues with the vehicle's video display, loss of audio or video functions, and the illumination of the check engine light.

2. What can cause the OBDII code U18C3 GMC to trigger?

- The code U18C3 is triggered when there is a communication failure between the vehicle's Video Processing Control Module and the High Speed CAN Bus.

3. How can I diagnose the cause of the communication failure for code U18C3 GMC?

- Diagnosis typically involves checking the wiring connections, inspecting for physical damage, and using a diagnostic scanner to verify the communication issue.

4. Can a malfunctioning Video Processing Control Module cause code U18C3 GMC?

- Yes, a malfunctioning Video Processing Control Module can cause the communication failure and trigger the U18C3 code.

5. Are there any common repair tips for resolving code U18C3 GMC?

- Common repair tips include checking and repairing any damaged wiring, ensuring proper connections, and replacing the Video Processing Control Module if necessary.

6. Is it safe to continue driving with the U18C3 GMC trouble code?

- It is generally not recommended to continue driving with the U18C3 code present, as it can affect the functionality of important vehicle systems.

7. Can a DIY enthusiast fix the U18C3 code issue at home?

- While some basic troubleshooting steps can be performed at home, resolving the U18C3 code may require professional diagnostic equipment and expertise.

8. How much does it typically cost to repair the U18C3 GMC trouble code?

- The cost of repairing the U18C3 code can vary depending on the cause of the communication failure, the need for parts replacement, and labor costs at the repair shop.

9. Will resetting the trouble codes make the U18C3 code disappear permanently?

- Resetting the trouble codes may temporarily clear the U18C3 code, but if the underlying communication issue is not fixed, the code is likely to reappear.

10. Can extreme weather conditions or electrical interference cause code U18C3 GMC to trigger?

- Yes, extreme weather conditions or electrical interference can potentially disrupt the communication between the Video Processing Control Module and the High Speed CAN Bus, leading to the U18C3 code.