AutoCodes – Generic – U18C3

U18C3 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 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 576

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

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?

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 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 code?

Need more information on how to fix the U18C3 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U18C3 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U18C3 Buick — Lost Communication With Video Processing Control Module On High Speed CAN Bus
U18C3 Cadillac — Lost Communication With Video Processing Control Module On High Speed CAN Bus
U18C3 Chevrolet — Lost Communication With Video Processing Control Module On High Speed CAN Bus
U18C3 GMC — Lost Communication With Video Processing Control Module On High Speed CAN Bus

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 Code

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

- Common symptoms include issues with the video display, navigation system, backup camera, or other multimedia functions in the vehicle.

2. What can cause the U18C3 code to appear?

- The code U18C3 often appears due to a communication breakdown between the vehicle's control module and the video processing control module on the high-speed CAN bus.

3. How can I diagnose the U18C3 code?

- Diagnosing the U18C3 code typically involves using a diagnostic scanner to retrieve the fault codes and then conducting a thorough inspection of the wiring, connectors, and modules involved in the high-speed CAN bus communication.

4. Can a faulty video processing control module cause the U18C3 code?

- Yes, a faulty video processing control module can cause the U18C3 code to appear as it disrupts communication with the vehicle's control module over the high-speed CAN bus.

5. What are some repair tips for fixing the U18C3 code?

- Repair tips for the U18C3 code may include checking and repairing any damaged wiring or connectors related to the high-speed CAN bus, replacing the video processing control module if necessary, and ensuring all modules are properly connected and functioning.

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

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

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

- Depending on the DIY enthusiast's skill level and access to tools, it may be possible to diagnose and repair the U18C3 code at home. However, complex electrical issues may require professional assistance.

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

- The cost of repairing the U18C3 code can vary depending on the underlying cause, parts needed for replacement, and labor costs. It is recommended to obtain quotes from different mechanics or repair shops.

9. Will resetting the fault codes make the U18C3 code disappear?

- Resetting the fault codes may temporarily make the U18C3 code disappear, but it will reappear if the underlying issue causing the communication breakdown is not addressed and fixed.

10. How long does it take to repair the U18C3 code?

- The repair time for the U18C3 code can vary depending on the complexity of the issue and the availability of parts. It is advisable to consult with a professional mechanic for a more accurate estimate.