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P0746 2015 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck Off

Quick Answer

The P0746 code for a 2015 GMC Sierra indicates a problem with the Transmission Control Solenoid Valve 1 being stuck off. Common causes include Faulty transmission control solenoid valve, Electrical issues such as wiring problems, Clogged valve body. 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
P0746 2015 GMC Sierra indicates Transmission Control Solenoid Valve 1 Stuck Off.
Common causes
Common causes include Faulty transmission control solenoid valve, Electrical issues such as wiring problems, Clogged valve body.
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 08, 2024
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Code P0746 2015 GMC Sierra Description

The P0746 code for a 2015 GMC Sierra indicates a problem with the Transmission Control Solenoid Valve 1 being stuck off. The transmission control solenoid valves are crucial components in the transmission system, responsible for regulating the flow of transmission fluid and controlling gear shifting. When Solenoid Valve 1 is stuck off, it means that the transmission is unable to properly shift gears, leading to a range of issues with the vehicle's performance.

OBDII Code P0746 2015 GMC Sierra - Transmission Control Solenoid Valve 1 Stuck Off
P0746 2015 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck Off

Common Causes of P0746 2015 GMC Sierra

  1. Faulty transmission control solenoid valve
  2. Electrical issues such as wiring problems
  3. Clogged valve body
  4. Low transmission fluid levels
  5. Internal transmission damage

Symptoms of P0746 2015 GMC Sierra

  1. Delayed or harsh shifting
  2. Gear slippage
  3. Poor acceleration
  4. Decreased fuel efficiency
  5. Transmission warning light illuminated on the dashboard

How to Fix P0746 2015 GMC Sierra

  1. Perform a diagnostic scan to confirm the P0746 code and identify the specific issue.
  2. Inspect the transmission control solenoid valve 1 for any signs of damage or malfunction.
  3. Check the wiring and electrical connections related to the solenoid valve for any issues.
  4. If necessary, replace the transmission control solenoid valve 1 and perform a transmission fluid flush and refill.
  5. Clear the trouble codes, test drive the vehicle, and ensure that the issue has been resolved.

Cost to Fix P0746 2015 GMC Sierra

The typical repair costs for addressing a P0746 code can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary depending on factors such as location, vehicle make and model, and engine type. It is recommended to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower prices.

What does this mean?

Tech Notes for P0746 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 P0746 2015 GMC Sierra Code

1. What does the OBDII code P0746 mean on a 2015 GMC Sierra?

P0746 indicates "Transmission Control Solenoid Valve 1 Stuck Off," meaning the transmission control module (TCM) has detected an issue with the performance or operation of the pressure control solenoid in the transmission.

2. What are the common symptoms of code P0746 in a 2015 GMC Sierra?

Symptoms may include harsh or erratic shifting, transmission slipping, inability to shift into certain gears, reduced fuel efficiency, or the vehicle entering "limp mode."

3. What causes the P0746 code to appear in a 2015 GMC Sierra?

Common causes include a faulty pressure control solenoid, low or dirty transmission fluid, a clogged transmission filter, wiring or connector issues, or internal transmission mechanical problems.

4. Can I still drive my 2015 GMC Sierra with a P0746 code?

Driving with a P0746 code is not recommended, as it can lead to further transmission damage. If the vehicle is in "limp mode," it should be inspected and repaired as soon as possible.

5. How do I diagnose a P0746 code in my 2015 GMC Sierra?

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

6. How can I fix the P0746 code on my 2015 GMC Sierra?

Repairs may include replacing the pressure control solenoid, changing or flushing the transmission fluid, replacing the transmission filter, repairing damaged wiring, or addressing internal transmission issues.

7. How much does it cost to repair a P0746 code on a 2015 GMC Sierra?

Repair costs vary depending on the issue but may range from $150 to $500 for solenoid replacement and fluid service. Internal transmission repairs can cost significantly more.

8. Can low or dirty transmission fluid cause the P0746 code on a 2015 GMC Sierra?

Yes, low or contaminated transmission fluid can disrupt solenoid operation and trigger the P0746 code. Checking and addressing the fluid condition is a key step in diagnosing this issue.

9. What tools are needed to diagnose the P0746 code on a 2015 GMC Sierra?

Basic tools include an OBDII scanner, a transmission fluid dipstick (if applicable), a multimeter for testing electrical circuits, and possibly a service manual for solenoid specifications.

10. Is the P0746 code a common issue for the 2015 GMC Sierra?

While not extremely common, P0746 can occur, especially in vehicles with higher mileage or poor transmission maintenance. Regular fluid changes can help prevent this issue.

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