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

Quick Answer

The U1814 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Powertrain Wake-Up Communication Circuit. Common causes include Faulty wiring or connectors in the communication circuit, Corrosion or damage to the PCM, Issues with the power supply to the PCM. 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 wiring or connectors in the communication circuit, Corrosion or damage to the PCM, Issues with the power supply to the PCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code U1814 2018 GMC Sierra Description

The U1814 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Powertrain Wake-Up Communication Circuit. This code indicates a problem with the communication circuit that wakes up the powertrain control module (PCM) when the vehicle is started. The PCM is responsible for controlling various aspects of the engine and transmission, so any issues with its communication circuit can have significant effects on the vehicle's performance.

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

Common Causes of U1814 2018 GMC Sierra

  1. Faulty wiring or connectors in the communication circuit
  2. Corrosion or damage to the PCM
  3. Issues with the power supply to the PCM
  4. Faulty sensors or modules connected to the PCM
  5. Software glitches or programming errors

Symptoms of U1814 2018 GMC Sierra

  1. Engine misfires or hesitation
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Difficulty starting the vehicle
  5. Illumination of the check engine light

How to Fix U1814 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring and connectors in the communication circuit to identify any damage or corrosion. Repair or replace any faulty components.
  2. Check the power supply to the PCM to ensure it is functioning correctly. Address any issues with the power source.
  3. Test the sensors and modules connected to the PCM to determine if any are faulty. Replace any defective components.
  4. If no visible issues are found, consider reprogramming or updating the PCM software to address any potential glitches.

Cost to Fix U1814 2018 GMC Sierra

The typical repair costs for addressing a U1814 code can vary depending on the extent of the issue and the specific repairs needed. In general, you can expect to pay anywhere from $200 to $500 for parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local shops for a more accurate estimate.

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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 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.

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