AutoCodes – Chevrolet – U18C8 2014 Chevrolet Silverado

U18C8 2014 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 2014 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 259

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 2014 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 2014 Chevrolet Silverado - Glow Plug Control Module Lost Communication with Engine Control Module - AutoCodes.com — U18C8 2014 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 2014 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 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 U18C8 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 U18C8 2014 Chevrolet Silverado code?

Need more information on how to fix the U18C8 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U18C8 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 U18C8 2014 Chevrolet Silverado Code

1. What does the OBDII code U18C8 on a 2014 Chevrolet Silverado indicate?

- The code U18C8 indicates that there is a communication issue between the Glow Plug Control Module and the Engine Control Module.

2. What are the common symptoms associated with the U18C8 code?

- Common symptoms include hard starting, rough idling, loss of power, and the illumination of the Check Engine Light.

3. What are the possible causes of the Glow Plug Control Module losing communication with the Engine Control Module?

- Possible causes include wiring issues, damaged connectors, faulty control modules, or software glitches.

4. How can I diagnose the U18C8 code on my 2014 Chevrolet Silverado?

- Diagnosing the code typically involves using an OBDII scanner to read the code and checking the wiring and connectors between the Glow Plug Control Module and Engine Control Module.

5. Can I still drive my Silverado with the U18C8 code present?

- It is not recommended to drive the vehicle with the U18C8 code present, as it can lead to performance issues and potential damage if left unresolved.

6. How can I repair the Glow Plug Control Module lost communication issue?

- Repairing the issue involves inspecting and repairing any damaged wiring or connectors, replacing faulty modules if necessary, and clearing the code with a diagnostic tool.

7. Is the U18C8 code a common issue in 2014 Chevrolet Silverados?

- While it may not be extremely common, communication issues between control modules can occur in any vehicle, including the 2014 Chevrolet Silverado.

8. Can a DIY enthusiast fix the U18C8 code issue at home?

- Depending on the root cause of the problem, some DIY enthusiasts with the necessary tools and knowledge of automotive electrical systems may be able to fix the issue at home.

9. How much does it typically cost to repair the U18C8 code at a dealership or repair shop?

- Repair costs can vary depending on the specific issue, but expect to pay for diagnostic time, parts replacement, and labor, which could range from a hundred to a few hundred dollars.

10. What should I do if I continue to experience issues after repairing the U18C8 code?

- If problems persist after repairing the code, it is advisable to consult a professional mechanic for further diagnosis and repair to ensure the issue is fully resolved.