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U1814 2016 GMC Sierra Code - Powertrain Wake-Up Communication Circuit

Quick Answer

The U1814 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Powertrain Wake-Up Communication Circuit. Common causes include Faulty wiring: Damaged or corroded wiring in the wake-up communication circuit can disrupt communication, Loose connections: Loose connections between modules or the PCM can cause intermittent communication issues, Faulty modules: A malfunctioning module, such as the PCM or body control module, can prevent proper communication. 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 2016 GMC Sierra indicates Powertrain Wake-Up Communication Circuit.
Common causes
Common causes include Faulty wiring: Damaged or corroded wiring in the wake-up communication circuit can disrupt communication, Loose connections: Loose connections between modules or the PCM can cause intermittent communication issues, Faulty modules: A malfunctioning module, such as the PCM or body control module, can prevent proper communication.
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 13, 2024
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Code U1814 2016 GMC Sierra Description

The U1814 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Powertrain Wake-Up Communication Circuit. This code indicates a communication issue within the powertrain control module (PCM) or between the PCM and other modules in the vehicle. The PCM is responsible for controlling various functions within the powertrain, such as engine performance, transmission shifting, and emissions control. When there is a problem with the wake-up communication circuit, it can lead to issues with starting the vehicle, poor performance, and potential safety concerns.

OBDII Code U1814 2016 GMC Sierra - Powertrain Wake-Up Communication Circuit
U1814 2016 GMC Sierra Code - Powertrain Wake-Up Communication Circuit

Common Causes of U1814 2016 GMC Sierra

  1. Faulty wiring: Damaged or corroded wiring in the wake-up communication circuit can disrupt communication.
  2. Loose connections: Loose connections between modules or the PCM can cause intermittent communication issues.
  3. Faulty modules: A malfunctioning module, such as the PCM or body control module, can prevent proper communication.
  4. Software issues: Software glitches or programming errors within the modules can lead to communication problems.
  5. Electrical issues: Voltage spikes or drops in the electrical system can affect communication between modules.

Symptoms of U1814 2016 GMC Sierra

  1. Engine starting issues: The vehicle may have difficulty starting or may not start at all.
  2. Poor engine performance: The engine may run rough, misfire, or lack power.
  3. Transmission shifting problems: The transmission may shift erratically or harshly.
  4. Warning lights: The check engine light or other warning lights may illuminate on the dashboard.
  5. Reduced fuel efficiency: The vehicle may experience decreased fuel economy due to improper communication between modules.

How to Fix U1814 2016 GMC Sierra

  1. Diagnose the issue: Use a diagnostic scan tool to retrieve the DTC and perform further testing to pinpoint the exact cause of the communication problem.
  2. Inspect wiring and connections: Check the wiring harness for damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test modules: Test the PCM and other modules involved in the communication circuit to determine if any are faulty. Replace any defective modules.
  4. Clear codes and reprogram: Clear the DTC from the PCM after repairs are made and reprogram any modules as necessary to ensure proper communication.
  5. Test drive: Take the vehicle for a test drive to verify that the communication issue has been resolved and that all systems are functioning correctly.

Cost to Fix U1814 2016 GMC Sierra

The cost of repairing a Powertrain Wake-Up Communication Circuit issue can vary depending on the exact cause of the problem and the labor rates in your area. In general, you can expect to pay anywhere from $200 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's a good idea to get a few quotes from different shops to compare prices. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 2016 GMC Sierra Code

1. What does the OBDII code U1814 mean on a 2016 GMC Sierra?

Code U1814 indicates a problem in the Powertrain Wake-Up Communication Circuit, which is responsible for ensuring proper communication between the vehicle's control modules during startup.

2. What are the common symptoms of code U1814 in a 2016 GMC Sierra?

Common symptoms include delayed engine start, rough idling, communication errors between control modules, or the check engine light being illuminated.

3. What causes the U1814 code to appear on a GMC Sierra?

The code can be triggered by faulty wiring, a damaged Powertrain Control Module (PCM), a malfunctioning Body Control Module (BCM), or corroded/loose electrical connections in the communication circuit.

4. Can driving with the U1814 code cause further damage?

While the vehicle may still operate, ignoring the issue can lead to communication failures between critical systems, potentially affecting performance and safety over time.

5. How do you diagnose a U1814 code on a 2016 GMC Sierra?

Diagnosis involves using an advanced scan tool to check for related codes, inspecting wiring and connectors for damage or corrosion, and testing the affected control modules for functionality.

6. What are the recommended repairs for the U1814 code?

Repairs may include repairing or replacing damaged wiring, cleaning corroded connectors, reprogramming or replacing faulty control modules, or inspecting the wake-up circuit for proper operation.

7. Can a software update fix the U1814 code?

In some cases, a software update for the control modules may resolve communication issues, but this depends on the root cause of the problem.

8. How much does it cost to fix a U1814 code on a 2016 GMC Sierra?

Repair costs vary depending on the issue but can range from $100 for simple wiring repairs to over $1,000 if module replacement or extensive diagnostics are required.

9. Is the U1814 code a common issue for the 2016 GMC Sierra?

It is not a widespread issue but can occur if the vehicle experiences electrical problems or if there is wear and tear in the communication circuit.

10. Can a dead battery cause the U1814 code to appear?

Yes, a weak or dead battery can disrupt the powertrain wake-up circuit and trigger the U1814 code. Ensure the battery is fully charged and in good condition before further diagnostics.

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