AutoCodes – GMC – U1814 2018 GMC Sierra

U1814 2018 GMC Sierra Code - Powertrain Wake-Up Communication Circuit

Quick Answer

The Body Control Module (BCM) activates the ignition circuit, when the ignition key is in ACC, ON or START. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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: U1814 2018 GMC Sierra indicates Powertrain Wake-Up Communication Circuit.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body 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 202

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 Jul 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1814 2018 GMC Sierra Description

The Body Control Module (BCM) activates the ignition circuit, when the ignition key is in ACC, ON or START. The ignition circuit wakes up the devices for serial data bus communication. The Diagnostic Trouble Code (DTC) will set when the BCM senses a short to ground on the ignition circuit.

OBDII Code U1814 2018 GMC Sierra - Powertrain Wake-Up Communication Circuit - AutoCodes.com — U1814 2018 GMC Sierra Code - Powertrain Wake-Up Communication Circuit

What does this mean?

What are the Possible Causes of the DTC U1814 2018 GMC Sierra?

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

How to Fix the DTC U1814 2018 GMC Sierra?

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 U1814 2018 GMC Sierra 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 U1814 2018 GMC Sierra code?

Need more information on how to fix the U1814 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1814 2018 GMC Sierra 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 U1814 2018 GMC Sierra Code

1. What are common symptoms of OBDII code U1814 in a 2018 GMC Sierra?

The common symptoms of code U1814 in a 2018 GMC Sierra include issues with starting the vehicle, rough idling, and the illumination of the check engine light.

2. What does the Powertrain Wake-Up Communication Circuit refer to in a GMC Sierra?

The Powertrain Wake-Up Communication Circuit is a system in the 2018 GMC Sierra that helps facilitate communication between different modules within the vehicle's powertrain.

3. What are the possible causes of OBDII code U1814 in a 2018 GMC Sierra?

Possible causes of code U1814 in a 2018 GMC Sierra include a faulty powertrain control module (PCM), wiring issues, poor connections, or a malfunctioning communication module.

4. How can I diagnose the Powertrain Wake-Up Communication Circuit issue in my GMC Sierra?

Diagnosing the Powertrain Wake-Up Communication Circuit issue in a GMC Sierra involves using a diagnostic scanner to read the OBDII codes, checking the wiring connections, and testing the communication modules for proper functionality.

5. Can I drive my 2018 GMC Sierra with OBDII code U1814?

It is not recommended to drive your 2018 GMC Sierra with code U1814 as it may lead to potential performance issues and further damage to the vehicle's powertrain system.

6. How can I repair OBDII code U1814 in my 2018 GMC Sierra?

Repairing code U1814 in a 2018 GMC Sierra involves addressing the root cause of the issue, which may include repairing or replacing the faulty powertrain control module, fixing wiring connections, or replacing malfunctioning communication modules.

7. Is it safe to reset the OBDII code U1814 in my GMC Sierra without fixing the underlying issue?

Resetting the OBDII code U1814 without addressing the underlying issue is not recommended as the problem will persist, and the check engine light is likely to illuminate again.

8. Can a DIY enthusiast fix OBDII code U1814 in a 2018 GMC Sierra?

Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to address code U1814 in a 2018 GMC Sierra by following repair guides and utilizing diagnostic tools.

9. How long does it typically take to repair OBDII code U1814 in a 2018 GMC Sierra?

The time taken to repair OBDII code U1814 in a 2018 GMC Sierra can vary based on the specific issue causing the code, but it may range from a few hours to a day, depending on the complexity of the repair.

10. Are there any recalls or technical service bulletins related to OBDII code U1814 in 2018 GMC Sierra vehicles?

It is recommended to check with GMC or a certified dealership for any recalls or technical service bulletins related to OBDII code U1814 in 2018 GMC Sierra vehicles as they may provide important information or solutions for the issue.