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P0747 2016 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck On

Quick Answer

The P0747 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Transmission Control Solenoid Valve 1 being stuck on. Common causes include Faulty transmission control solenoid valve, Wiring issues or electrical connections related to the solenoid, Low transmission fluid levels or dirty fluid. 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 2016 GMC Sierra indicates Transmission Control Solenoid Valve 1 Stuck On.
Common causes
Common causes include Faulty transmission control solenoid valve, Wiring issues or electrical connections related to the solenoid, Low transmission fluid levels or dirty fluid.
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 16, 2024
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Code P0747 2016 GMC Sierra Description

The P0747 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Transmission Control Solenoid Valve 1 being stuck on. The transmission control solenoid is a crucial component of the transmission system that helps regulate the flow of transmission fluid and controls the shifting of gears. When this solenoid gets stuck in the on position, it can lead to various issues with the vehicle's transmission performance.

OBDII Code P0747 2016 GMC Sierra - Transmission Control Solenoid Valve 1 Stuck On
P0747 2016 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck On

Common Causes of P0747 2016 GMC Sierra

  1. Faulty transmission control solenoid valve
  2. Wiring issues or electrical connections related to the solenoid
  3. Low transmission fluid levels or dirty fluid
  4. Mechanical problems within the transmission system
  5. Issues with the TCM or other related components

Symptoms of P0747 2016 GMC Sierra

  1. Harsh or delayed shifting between gears
  2. Transmission slipping or jerking during acceleration
  3. Decreased fuel efficiency
  4. Illuminated check engine light
  5. Transmission overheating

How to Fix P0747 2016 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a scan tool to confirm the P0747 code.
  2. Inspect the transmission control solenoid valve and related wiring for any signs of damage or wear.
  3. Check the transmission fluid level and condition, topping off or replacing as necessary.
  4. Test the solenoid valve's functionality using a multimeter to determine if it is faulty.
  5. Replace the transmission control solenoid valve if it is determined to be the root cause of the issue.

Cost to Fix P0747 2016 GMC Sierra

The cost of repairing a P0747 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of replacing a transmission control solenoid valve can range from $150 to $400, with additional costs for diagnostic testing, transmission fluid, and labor. Overall, you can expect to pay anywhere from $300 to $800 for this repair, but it's advisable to obtain quotes from local auto repair shops for a more accurate estimate. Keep in mind that labor rates can vary between $80 and $150 per hour, so the total cost may fluctuate based on your location and the shop you choose.

What does this mean?

Tech Notes for P0747 2016 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 2016 GMC Sierra Code

1. What does the OBDII code P0747 mean on a 2016 GMC Sierra?

P0747 indicates that the Transmission Control Solenoid Valve 1 is stuck in the "on" position, which can lead to improper transmission operation.

2. What are the common symptoms of code P0747 in a 2016 GMC Sierra?

Symptoms may include harsh shifting, slipping transmission, inability to change gears, reduced fuel efficiency, and activation of the check engine light.

3. What causes the P0747 code to trigger on a 2016 GMC Sierra?

Potential causes include a faulty transmission control solenoid, low or dirty transmission fluid, wiring issues, or internal transmission damage.

4. Can I drive my 2016 GMC Sierra with a P0747 code active?

Driving with a P0747 code is not recommended, as it can lead to further transmission damage or unsafe driving conditions.

5. How can I diagnose the P0747 code on my 2016 GMC Sierra?

Diagnosis involves scanning for codes, inspecting the transmission fluid, checking the solenoid’s electrical connections, and testing the solenoid for proper operation.

6. What is the cost to repair a P0747 code in a 2016 GMC Sierra?

Repair costs can vary widely, from $150 to $400 for a solenoid replacement, but may be higher if internal transmission repairs are needed.

7. Can dirty transmission fluid cause the P0747 code on a 2016 GMC Sierra?

Yes, dirty or contaminated transmission fluid can cause the solenoid to stick or malfunction, leading to a P0747 code.

8. How do I fix the P0747 code on my 2016 GMC Sierra?

Fixes may include replacing the faulty solenoid, cleaning or replacing the transmission fluid, repairing damaged wiring, or addressing internal transmission issues.

9. What tools are needed to troubleshoot the P0747 code on a 2016 GMC Sierra?

You may need an OBDII scanner, a multimeter for electrical testing, and basic tools for inspecting and replacing transmission components.

10. Can a P0747 code be caused by a faulty transmission control module (TCM)?

While rare, a malfunctioning TCM can contribute to a P0747 code if it fails to properly control the solenoid’s operation.

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