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P0746 2014 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck Off

Quick Answer

The P0746 diagnostic trouble code (DTC) in a 2014 GMC Sierra indicates that the Transmission Control Solenoid Valve 1 is stuck off. Common causes include Faulty transmission control solenoid valve, Low transmission fluid levels, Contaminated transmission 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
P0746 2014 GMC Sierra indicates Transmission Control Solenoid Valve 1 Stuck Off.
Common causes
Common causes include Faulty transmission control solenoid valve, Low transmission fluid levels, Contaminated transmission 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 08, 2024
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Code P0746 2014 GMC Sierra Description

The P0746 diagnostic trouble code (DTC) in a 2014 GMC Sierra indicates that the Transmission Control Solenoid Valve 1 is stuck off. This solenoid is responsible for regulating the flow of transmission fluid in the transmission system, specifically controlling the engagement and disengagement of the clutch packs. When this solenoid fails to function properly, it can lead to significant issues with the vehicle's transmission system.

OBDII Code P0746 2014 GMC Sierra - Transmission Control Solenoid Valve 1 Stuck Off
P0746 2014 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck Off

Common Causes of P0746 2014 GMC Sierra

  1. Faulty transmission control solenoid valve
  2. Low transmission fluid levels
  3. Contaminated transmission fluid
  4. Electrical issues in the transmission control module
  5. Mechanical problems within the transmission system

Symptoms of P0746 2014 GMC Sierra

  1. Harsh or delayed shifting
  2. Slipping gears
  3. Transmission overheating
  4. Decreased fuel efficiency
  5. Illumination of the check engine light

How to Fix P0746 2014 GMC Sierra

  1. Perform a diagnostic scan to confirm the P0746 code and identify the specific cause of the issue.
  2. Inspect the transmission control solenoid valve for any signs of damage or obstruction.
  3. Check the transmission fluid level and condition, topping off or replacing as needed.
  4. Test the electrical connections and wiring related to the transmission control module.
  5. If necessary, replace the faulty transmission control solenoid valve and retest the system for proper function.

Cost to Fix P0746 2014 GMC Sierra

The cost of repairing a P0746 code in a 2014 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. Typically, replacing a transmission control solenoid valve can range from $150 to $300 for the part, with additional costs for labor that may amount to $150 to $300. Overall, the total repair cost for addressing this code could range from $300 to $600. However, it is advisable to consult with a professional mechanic or auto repair shop for a more accurate estimate based on your specific situation. Keep in mind that labor rates and part prices can vary based on location and other factors.

What does this mean?

Tech Notes for P0746 2014 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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