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U1814 2015 GMC Sierra Code - Powertrain Wake-Up Communication Circuit

Quick Answer

The U1814 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Powertrain Wake-Up Communication Circuit. Common causes include Faulty powertrain control module (PCM), Loose or corroded electrical connections within the communication circuit, Wiring harness issues, such as chafed or damaged wires. 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 2015 GMC Sierra indicates Powertrain Wake-Up Communication Circuit.
Common causes
Common causes include Faulty powertrain control module (PCM), Loose or corroded electrical connections within the communication circuit, Wiring harness issues, such as chafed or damaged wires.
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 12, 2024
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Code U1814 2015 GMC Sierra Description

The U1814 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Powertrain Wake-Up Communication Circuit. This code indicates a communication issue within the vehicle's powertrain control module (PCM) or other related modules. The powertrain control module is a crucial component that controls various functions within the engine and transmission systems, such as fuel delivery, ignition timing, and shifting points. The Powertrain Wake-Up Communication Circuit is responsible for initializing communication between different modules in the vehicle when it is powered on or wakes up from sleep mode.

OBDII Code U1814 2015 GMC Sierra - Powertrain Wake-Up Communication Circuit
U1814 2015 GMC Sierra Code - Powertrain Wake-Up Communication Circuit

Common Causes of U1814 2015 GMC Sierra

  1. Faulty powertrain control module (PCM).
  2. Loose or corroded electrical connections within the communication circuit.
  3. Wiring harness issues, such as chafed or damaged wires.
  4. Faulty sensors or modules that disrupt communication with the PCM.
  5. Software issues or programming errors in the PCM.

Symptoms of U1814 2015 GMC Sierra

  1. Illuminated check engine light on the dashboard.
  2. Engine running rough or misfiring.
  3. Transmission shifting erratically or hesitating.
  4. Reduced fuel efficiency.
  5. Vehicle stalling or difficulty starting.

How to Fix U1814 2015 GMC Sierra

  1. Perform a thorough diagnostic scan using a professional OBD-II scanner to retrieve the specific fault codes and pinpoint the exact cause of the communication issue.
  2. Inspect all electrical connections related to the Powertrain Wake-Up Communication Circuit, including connectors, wiring harnesses, and grounds, to ensure they are secure and free of corrosion.
  3. Test the powertrain control module (PCM) and other modules for proper functionality, replacing any faulty components as needed.
  4. Repair or replace any damaged wiring or connectors within the communication circuit to restore proper communication between modules.
  5. Clear the fault codes and perform a test drive to ensure the issue has been resolved and the vehicle is operating correctly.

Cost to Fix U1814 2015 GMC Sierra

The cost of repairing the Powertrain Wake-Up Communication Circuit issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, the repair costs for this type of issue can range from $200 to $500, including parts and labor. Keep in mind that additional diagnostic time may be required to pinpoint the exact cause of the communication issue, which can affect the overall repair costs. It is recommended to consult with a trusted mechanic or auto repair shop to get an accurate estimate based on your vehicle's make and model.

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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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code U1814 in a 2015 GMC Sierra?

The common symptoms of U1814 in a 2015 GMC Sierra may include intermittent or complete loss of communication with the powertrain control module (PCM), resulting in issues like stalling, rough idling, or difficulty starting the vehicle.

2. What is the likely cause of OBDII code U1814 in a 2015 GMC Sierra?

The most likely cause of U1814 in a 2015 GMC Sierra is a malfunction in the powertrain wake-up communication circuit, which can be due to wiring issues, a faulty PCM, or a poor connection.

3. How can I diagnose the powertrain wake-up communication circuit issue causing code U1814 in my 2015 GMC Sierra?

To diagnose the issue, you should start by checking the wiring harness for any visible damage or loose connections. Using a multimeter, test the continuity of the circuit and inspect the PCM for any signs of damage or malfunction.

4. Can a DIY enthusiast repair OBDII code U1814 in a 2015 GMC Sierra?

While some simple wiring fixes or connector reseating can be done by a DIY enthusiast, diagnosing and repairing complex issues related to the powertrain wake-up communication circuit may require professional knowledge and diagnostic tools.

5. Is it safe to continue driving a 2015 GMC Sierra with OBDII code U1814?

It is not recommended to drive a vehicle with unresolved OBDII code U1814, as it can lead to potential safety hazards and further damage to the powertrain system. It is advisable to address the issue promptly.

6. How much does it typically cost to repair OBDII code U1814 in a 2015 GMC Sierra?

The cost of repairing U1814 in a 2015 GMC Sierra can vary depending on the exact cause of the issue, labor costs in your area, and whether new parts are needed. It is best to obtain quotes from reputable mechanics.

7. Can a faulty battery or alternator cause OBDII code U1814 in a 2015 GMC Sierra?

While a faulty battery or alternator can potentially cause communication issues in a vehicle, OBDII code U1814 specifically relates to the powertrain wake-up communication circuit, so it is more likely related to wiring or PCM problems.

8. Will resetting the OBDII code U1814 in a 2015 GMC Sierra make it go away permanently?

Resetting the code may temporarily clear the check engine light, but if the underlying issue with the powertrain wake-up communication circuit is not fixed, the code is likely to reappear after driving cycles.

9. Are there any recalls or technical service bulletins related to OBDII code U1814 in a 2015 GMC Sierra?

It is recommended to check with a GMC dealership or visit the NHTSA website to see if there are any recalls or technical service bulletins related to OBDII code U1814 specifically for the 2015 GMC Sierra model.

10. Can extreme weather conditions affect the occurrence of OBDII code U1814 in a 2015 GMC Sierra?

Extreme weather conditions can sometimes exacerbate existing electrical issues in a vehicle, including those related to the powertrain wake-up communication circuit. It is important to keep the vehicle well maintained to minimize the impact of weather on such systems.

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