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P0747 2015 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck On

Quick Answer

The P0747 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the Transmission Control Solenoid Valve 1 being stuck on. Common causes include Faulty Transmission Control Solenoid Valve 1, Wiring issues or electrical connection problems, Low transmission fluid levels. 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
P0747 2015 GMC Sierra indicates Transmission Control Solenoid Valve 1 Stuck On.
Common causes
Common causes include Faulty Transmission Control Solenoid Valve 1, Wiring issues or electrical connection problems, Low transmission fluid levels.
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 14, 2024
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Code P0747 2015 GMC Sierra Description

The P0747 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the Transmission Control Solenoid Valve 1 being stuck on. This solenoid is responsible for regulating the flow of transmission fluid within the transmission system. When the solenoid gets stuck in the "on" position, it can lead to various issues with the transmission's operation.

OBDII Code P0747 2015 GMC Sierra - Transmission Control Solenoid Valve 1 Stuck On
P0747 2015 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck On

Common Causes of P0747 2015 GMC Sierra

  1. Faulty Transmission Control Solenoid Valve 1
  2. Wiring issues or electrical connection problems
  3. Low transmission fluid levels
  4. Malfunctioning transmission control module
  5. Internal transmission damage

Symptoms of P0747 2015 GMC Sierra

  1. Harsh or delayed shifting between gears
  2. Transmission staying in one gear
  3. Slipping transmission
  4. Illumination of the Check Engine Light
  5. Decreased fuel efficiency

How to Fix P0747 2015 GMC Sierra

  1. Perform a diagnostic scan to confirm the P0747 code and identify the specific issue.
  2. Inspect the Transmission Control Solenoid Valve 1 for any visible damage or signs of malfunction.
  3. Check the wiring and electrical connections related to the solenoid for any faults or loose connections.
  4. Replace the faulty Transmission Control Solenoid Valve 1 if necessary.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0747 2015 GMC Sierra

The typical repair costs for addressing a P0747 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. Generally, replacing a Transmission Control Solenoid Valve 1 can cost between $150 and $300 for the part alone. Including labor costs, the total repair bill could range from $300 to $600 or more. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific needs and location. Keep in mind that labor rates can vary between different shops and regions.

What does this mean?

Tech Notes for P0747 2015 GMC Sierra

When a transmission solenoid has malfunctioned, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is dirty, it's recommended to change the transmission fluid and if possible, remove the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure, and that the transmission will need to be rebuilt or replaced.

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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 P0747 2015 GMC Sierra Code

1. What does the OBDII code P0747 mean on a 2015 GMC Sierra?

P0747 indicates that Transmission Control Solenoid Valve 1 is stuck in the "On" position, potentially causing shifting issues or transmission performance problems.

2. What are the symptoms of code P0747 in a 2015 GMC Sierra?

Symptoms may include harsh or erratic shifting, the transmission being stuck in one gear, decreased fuel efficiency, and the check engine light illuminating.

3. What causes the P0747 code to appear on a 2015 GMC Sierra?

Common causes include a faulty transmission control solenoid, dirty or low transmission fluid, internal transmission damage, or an electrical issue such as damaged wiring or connectors.

4. Can I drive my 2015 GMC Sierra with the P0747 code active?

Driving with the P0747 code is not recommended as it can lead to further damage to the transmission and unsafe driving conditions due to shifting issues.

5. How do I diagnose the P0747 code on my 2015 GMC Sierra?

Diagnosis involves checking the transmission fluid level and condition, inspecting wiring and connectors for damage, testing the control solenoid for proper operation, and scanning for additional codes.

6. How much does it cost to fix the P0747 code on a 2015 GMC Sierra?

Repair costs vary depending on the cause. Replacing a transmission control solenoid typically costs between $150 and $400, while more extensive transmission repairs can be significantly more expensive.

7. Can low transmission fluid cause the P0747 code in a 2015 GMC Sierra?

Yes, low or dirty transmission fluid can lead to solenoid malfunctions and trigger the P0747 code. Ensuring proper fluid levels and condition is important.

8. Do I need to replace the transmission if the P0747 code is active on my 2015 GMC Sierra?

Not necessarily. The issue might be resolved by replacing the solenoid, cleaning the valve body, or fixing electrical problems. A full transmission replacement is typically a last resort.

9. How can I prevent the P0747 code from occurring in my 2015 GMC Sierra?

Regularly maintain the transmission by checking fluid levels, changing the fluid and filter as recommended, and addressing any transmission issues promptly.

10. Is the P0747 code covered under warranty for a 2015 GMC Sierra?

It depends on the type and duration of your warranty. Powertrain warranties may cover transmission-related issues, but it's best to check with your dealer or manufacturer.

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