AutoCodes – Chevrolet – U18C8 2017 Chevrolet Silverado

U18C8 2017 Chevrolet Silverado Code - Glow Plug Control Module Lost Communication with Engine Control Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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: U18C8 2017 Chevrolet Silverado indicates Glow Plug Control Module Lost Communication with Engine Control Module.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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 219

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 U18C8 2017 Chevrolet Silverado 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 be set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U18C8 2017 Chevrolet Silverado - Glow Plug Control Module Lost Communication with Engine Control Module - AutoCodes.com — U18C8 2017 Chevrolet Silverado Code - Glow Plug Control Module Lost Communication with Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U18C8 2017 Chevrolet Silverado?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC U18C8 2017 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 U18C8 2017 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 U18C8 2017 Chevrolet Silverado code?

Need more information on how to fix the U18C8 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U18C8 2017 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 U18C8 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U18C8 on a 2017 Chevrolet Silverado?

- Common symptoms include hard starting, rough idling, reduced engine performance, and the illumination of the check engine light.

2. What could cause the Glow Plug Control Module to lose communication with the Engine Control Module in a 2017 Chevrolet Silverado?

- Possible causes could include wiring issues, a faulty control module, a software glitch, or a communication network problem within the vehicle.

3. How is the U18C8 code diagnosed in a 2017 Chevrolet Silverado?

- Diagnosis involves using a diagnostic scanner to retrieve the trouble codes, inspecting the wiring and connectors between the modules, and performing communication tests to identify the root cause.

4. Can driving with the U18C8 code present cause further damage to the 2017 Chevrolet Silverado?

- Continuing to drive with this code may lead to performance issues and potential damage to the engine components over time. It's recommended to address the issue promptly.

5. What are the repair options for fixing the U18C8 code on a 2017 Chevrolet Silverado?

- Repair options may include checking and repairing the wiring connections, replacing the faulty control module, updating software if needed, or addressing any network communication problems.

6. How much does it typically cost to repair the U18C8 code on a 2017 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the communication issue. It may range from a simple wiring repair to a module replacement, with costs varying accordingly.

7. Are there any DIY tips for addressing the U18C8 code on a 2017 Chevrolet Silverado?

- DIY tips may include visually inspecting wiring connections, ensuring proper grounding, and checking for loose or damaged connectors before seeking professional assistance.

8. Can resetting the OBDII code on a 2017 Chevrolet Silverado make the issue go away temporarily?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the code is not addressed, the problem is likely to recur.

9. How long does it typically take to repair the U18C8 code on a 2017 Chevrolet Silverado?

- The repair time can vary depending on the complexity of the issue. Simple fixes like checking connections may take a short time, while module replacement or software updates may take longer.

10. Is it safe to drive a 2017 Chevrolet Silverado with the U18C8 code if the vehicle seems to be running fine?

- While the vehicle may seem to operate normally, it's best to address the underlying issue promptly to prevent potential performance issues or further damage in the long run.