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P0746 2015 Chevrolet Silverado Code - Transmission Control Solenoid Valve 1 Stuck Off

Quick Answer

The P0746 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a problem with the Transmission Control Solenoid Valve 1 being stuck off. Common causes include Internal mechanical failure of the solenoid valve, Electrical issues such as a faulty wiring connection, Malfunction in the transmission control module. 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 Chevrolet Silverado indicates Transmission Control Solenoid Valve 1 Stuck Off.
Common causes
Common causes include Internal mechanical failure of the solenoid valve, Electrical issues such as a faulty wiring connection, Malfunction in the transmission control module.
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 P0746 2015 Chevrolet Silverado Description

The P0746 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a problem with the Transmission Control Solenoid Valve 1 being stuck off. This solenoid is responsible for controlling the flow of transmission fluid within the transmission system. When the solenoid is stuck in the off position, it can lead to various issues with the transmission's performance.

OBDII Code P0746 2015 Chevrolet Silverado - Transmission Control Solenoid Valve 1 Stuck Off
P0746 2015 Chevrolet Silverado Code - Transmission Control Solenoid Valve 1 Stuck Off

Common Causes of P0746 2015 Chevrolet Silverado

  1. Internal mechanical failure of the solenoid valve
  2. Electrical issues such as a faulty wiring connection
  3. Malfunction in the transmission control module
  4. Low transmission fluid levels
  5. Contaminated transmission fluid

Symptoms of P0746 2015 Chevrolet Silverado

  1. Delayed or harsh shifting
  2. Slipping gears
  3. Poor acceleration
  4. Reduced fuel efficiency
  5. Transmission failure to shift

How to Fix P0746 2015 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the transmission system to identify the root cause of the issue.
  2. Test the Transmission Control Solenoid Valve 1 to determine if it is functioning properly or needs to be replaced.
  3. Check the transmission fluid levels and quality, topping up or replacing as necessary.
  4. Inspect the wiring connections and the transmission control module for any signs of damage or malfunction.
  5. Clear the DTC from the vehicle's computer system after completing the repairs and conduct a test drive to ensure the issue has been resolved.

Cost to Fix P0746 2015 Chevrolet Silverado

The typical repair costs for addressing a P0746 code on a 2015 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, replacing a Transmission Control Solenoid Valve 1 can range from $150 to $400, including parts and labor. Additional costs may apply if other components need to be replaced or if further diagnostics are required. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for P0746 2015 Chevrolet Silverado

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 Chevrolet Silverado Code

1. What does OBDII code P0746 on a 2015 Chevrolet Silverado indicate?

The code P0746 points to an issue with the Transmission Control Solenoid Valve 1 being stuck off.

2. What are the common symptoms of a Transmission Control Solenoid Valve 1 Stuck Off issue on a Chevrolet Silverado?

Symptoms may include harsh shifting, transmission slipping, poor fuel economy, and possibly the vehicle going into "limp mode."

3. What are the possible causes of the Transmission Control Solenoid Valve 1 Stuck Off trouble code?

Common causes include a faulty solenoid, low transmission fluid levels, dirty or contaminated transmission fluid, or wiring/connectivity issues.

4. How serious is the P0746 OBDII code on a 2015 Chevrolet Silverado?

Ignoring this code can lead to further damage to the transmission system, potentially resulting in costly repairs. It is advisable to address the issue promptly.

5. Can I continue driving my Chevrolet Silverado with the P0746 code present?

It's not recommended to drive the vehicle extensively with this code active, as it can lead to transmission problems. Get it checked and repaired as soon as possible.

6. How can I diagnose a Transmission Control Solenoid Valve 1 Stuck Off problem on my 2015 Chevrolet Silverado?

Proper diagnosis involves using a scan tool to read the code, checking the transmission fluid level and condition, and inspecting the solenoid and related wiring.

7. What is the typical repair process for fixing the P0746 code on a Chevrolet Silverado?

Repairs may involve replacing the faulty solenoid, cleaning or flushing the transmission fluid, addressing any wiring issues, and resetting the trouble code.

8. Can I fix the Transmission Control Solenoid Valve issue on my Chevrolet Silverado myself?

While some DIY enthusiasts may attempt the repair, it is recommended to have a qualified mechanic diagnose and fix the problem to ensure it is done correctly.

9. How much does it cost to repair a Transmission Control Solenoid Valve 1 Stuck Off issue on a 2015 Chevrolet Silverado?

Repair costs can vary depending on the exact cause of the problem, but it may range from a couple of hundred dollars for a simple fix to over a thousand for more complex issues.

10. How can I prevent the P0746 code from reoccurring on my Chevrolet Silverado after repair?

Regularly servicing your transmission, maintaining proper fluid levels, and addressing any related issues promptly can help prevent the reoccurrence of the P0746 trouble code.

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