Engine-CodesGMC – P0746 2017 GMC Sierra

P0746 2017 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck Off

Quick Answer

The P0746 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates an issue with the Transmission Control Solenoid Valve 1 being stuck off. Common causes include Faulty Transmission Control Solenoid Valve 1, Wiring issues, Poor connection. 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 2017 GMC Sierra indicates Transmission Control Solenoid Valve 1 Stuck Off.
Common causes
Common causes include Faulty Transmission Control Solenoid Valve 1, Wiring issues, Poor connection.
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.
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P0746 2017 GMC Sierra Description

The P0746 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates an issue with the Transmission Control Solenoid Valve 1 being stuck off. This solenoid valve is a crucial component of the transmission system, responsible for controlling the flow of transmission fluid to various components within the transmission. When this solenoid valve is stuck off, it means that it is not allowing the proper amount of fluid to flow through, which can lead to a variety of issues with the transmission's operation.

OBDII Code P0746 2017 GMC Sierra - Transmission Control Solenoid Valve 1 Stuck Off
P0746 2017 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck Off

Common Causes of P0746 2017 GMC Sierra

  1. Faulty Transmission Control Solenoid Valve 1
  2. Wiring issues
  3. Poor connection
  4. Transmission control module problem
  5. Low transmission fluid level

Symptoms of P0746 2017 GMC Sierra

  1. Erratic shifting
  2. Harsh shifting
  3. Delayed shifting
  4. Transmission slipping
  5. Transmission overheating

How to Fix P0746 2017 GMC Sierra

  1. Perform a diagnostic scan to confirm the P0746 code and identify the exact cause of the issue.
  2. Inspect the Transmission Control Solenoid Valve 1 for any signs of damage or malfunction.
  3. Check the wiring and connections associated with the solenoid valve for any issues.
  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 P0746 2017 GMC Sierra

The typical repair costs for addressing a P0746 code on a 2017 GMC Sierra can vary depending on the exact cause of the issue and the labor rates in your area. On average, the cost of replacing a Transmission Control Solenoid Valve 1 can range from $150 to $300, including parts and labor. Additional costs may apply if there are other underlying issues that need to be addressed. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your specific situation. Keep in mind that labor rates can vary between different locations and types of repair facilities.

Tech Notes for P0746 2017 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.

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