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Engine-Codes – GMC – U1814 GMC

U1814 GMC Code - Powertrain Wake-Up Communication Circuit

Quick Answer

The U1814 diagnostic trouble code (DTC) for GMC vehicles refers to a Powertrain Wake-Up Communication Circuit issue. Common causes include Wiring Issues: Damaged or corroded wiring in the Powertrain Wake-Up Communication Circuit can trigger the U1814 code, Faulty Connectors: Loose or damaged connectors between modules and sensors can disrupt communication and lead to this code, Faulty PCM: A malfunctioning Powertrain Control Module can also be a cause of the U1814 code. 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 GMC indicates Powertrain Wake-Up Communication Circuit.
Common causes
Common causes include Wiring Issues: Damaged or corroded wiring in the Powertrain Wake-Up Communication Circuit can trigger the U1814 code, Faulty Connectors: Loose or damaged connectors between modules and sensors can disrupt communication and lead to this code, Faulty PCM: A malfunctioning Powertrain Control Module can also be a cause of the U1814 code.
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 11, 2024
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Code U1814 GMC Description

The U1814 diagnostic trouble code (DTC) for GMC vehicles refers to a Powertrain Wake-Up Communication Circuit issue. In modern vehicles, the Powertrain Control Module (PCM) communicates with various modules and sensors in the vehicle to control engine and transmission functions. The wake-up communication circuit is responsible for waking up various modules in the vehicle when it is started or during operation.

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

Common Causes of U1814 GMC

  1. Wiring Issues: Damaged or corroded wiring in the Powertrain Wake-Up Communication Circuit can trigger the U1814 code.
  2. Faulty Connectors: Loose or damaged connectors between modules and sensors can disrupt communication and lead to this code.
  3. Faulty PCM: A malfunctioning Powertrain Control Module can also be a cause of the U1814 code.
  4. Module Communication Issues: Problems with communication between various modules in the vehicle can trigger this code.

Symptoms of U1814 GMC

  1. Check Engine Light: The most common symptom associated with the U1814 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Engine Performance Issues: The vehicle may experience poor acceleration, rough idling, or hesitation during acceleration.
  3. Transmission Shifting Problems: The transmission may shift erratically or experience delays in shifting gears.
  4. Stalling: The vehicle may stall while idling or coming to a stop.

How to Fix U1814 GMC

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC and perform a thorough inspection of the Powertrain Wake-Up Communication Circuit to identify the root cause of the problem.
  2. Repair Wiring and Connectors: Repair or replace any damaged wiring or connectors in the circuit to ensure proper communication between modules.
  3. Check PCM Functionality: Test the PCM to determine if it is functioning correctly. If necessary, replace the PCM with a new one.
  4. Clear DTC and Test Drive: Clear the DTC from the PCM memory and test drive the vehicle to ensure that the issue has been resolved.
  5. Perform Final Checks: Perform a final inspection to confirm that the U1814 code does not return and that the vehicle's performance has been restored.

Cost to Fix U1814 GMC

The typical repair costs for addressing a Powertrain Wake-Up Communication Circuit issue, such as the U1814 code, can vary depending on the specific cause of the problem. In general, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $100 to $300. Overall, the total cost of repairing this issue can be anywhere from $200 to $800. It is important to note that labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. Therefore, it is advisable to check with local shops for a more accurate estimate.

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Information for Specific GMC Models

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 GMC Code

1. What are the common symptoms of OBDII code U1814 GMC?

The common symptoms of OBDII code U1814 GMC include difficulty starting the vehicle, intermittent issues with powertrain components, and the illumination of the check engine light.

2. What does the OBDII code U1814 GMC indicate?

OBDII code U1814 for GMC refers to a Powertrain Wake-Up Communication Circuit fault. It means there is a problem with the communication circuit responsible for waking up the powertrain control module.

3. What are the possible causes of OBDII code U1814 GMC?

Possible causes of OBDII code U1814 GMC include faulty wiring or connectors in the wake-up communication circuit, issues with the powertrain control module, or a malfunction in the wake-up communication module itself.

4. How serious is OBDII code U1814 GMC?

OBDII code U1814 GMC can cause starting issues and intermittent powertrain problems. While it may not immediately affect the drivability of the vehicle, it is important to address this issue promptly to prevent further complications.

5. How can OBDII code U1814 GMC be diagnosed?

Diagnosing OBDII code U1814 GMC typically involves using a diagnostic scanner to retrieve the code and performing a thorough inspection of the wake-up communication circuit, including wiring, connectors, and modules, to identify the root cause of the issue.

6. Can I repair OBDII code U1814 GMC myself?

Repairing OBDII code U1814 GMC may require advanced automotive diagnostic skills and knowledge of electrical systems. If you are comfortable working with vehicle electronics, you may be able to address this issue; otherwise, it is recommended to seek professional help.

7. Is it safe to drive with OBDII code U1814 GMC active?

While driving with OBDII code U1814 GMC active may not immediately pose a safety risk, it is advisable to address the underlying issue promptly to prevent potential powertrain malfunctions and ensure the overall reliability of the vehicle.

8. How much does it cost to repair OBDII code U1814 GMC?

The cost of repairing OBDII code U1814 GMC can vary depending on the underlying cause of the issue, the extent of the repairs needed, and the labor rates of the service provider. It is recommended to obtain quotes from different automotive professionals for an accurate estimate.

9. Can OBDII code U1814 GMC cause other problems in the vehicle?

If left unaddressed, OBDII code U1814 GMC can potentially lead to further electrical issues within the powertrain system, affecting the overall performance and drivability of the vehicle. It is important to address this code promptly to prevent additional problems.

10. How can I prevent OBDII code U1814 GMC from recurring?

To prevent OBDII code U1814 GMC from recurring, ensure regular maintenance checks on the vehicle's electrical system, including inspecting wiring and connectors for any signs of wear or damage. Additionally, addressing any related issues promptly can help prevent the code from reoccurring.

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