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P0746 Chevrolet Code - Transmission Control Solenoid Valve 1 Stuck Off

Quick Answer

The P0746 code for Chevrolet vehicles indicates a problem with the Transmission Control Solenoid Valve 1 being stuck off. Common causes include Faulty transmission control solenoid valve, Wiring issues or electrical problems, Transmission control module malfunction. 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 Chevrolet indicates Transmission Control Solenoid Valve 1 Stuck Off.
Common causes
Common causes include Faulty transmission control solenoid valve, Wiring issues or electrical problems, Transmission control module malfunction.
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 Chevrolet Description

The P0746 code for Chevrolet vehicles indicates a problem with the Transmission Control Solenoid Valve 1 being stuck off. The transmission control solenoid is a crucial component of the transmission system, responsible for regulating the flow of transmission fluid and controlling gear shifts. When this solenoid valve is stuck in the off position, it can lead to significant issues with the transmission's performance.

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

Common Causes of P0746 Chevrolet

  1. Faulty transmission control solenoid valve
  2. Wiring issues or electrical problems
  3. Transmission control module malfunction
  4. Low transmission fluid levels
  5. Internal transmission mechanical problem

Symptoms of P0746 Chevrolet

  1. Rough or delayed shifting
  2. Jerking or hesitation during acceleration
  3. Inability to shift gears
  4. Illumination of the Check Engine Light
  5. Decreased fuel efficiency

How to Fix P0746 Chevrolet

  1. Begin by conducting a thorough diagnostic scan to retrieve the fault code and pinpoint the specific issue with the transmission control solenoid valve 1.
  2. Inspect the transmission control solenoid valve and its wiring for any visible damage or corrosion. Replace the solenoid valve if necessary.
  3. Check the transmission fluid levels and quality. Top off or replace the fluid if it is low or contaminated.
  4. Test the transmission control module to ensure it is functioning correctly. Replace or reprogram the module if needed.
  5. Clear the fault code from the vehicle's computer system and test drive the vehicle to ensure proper operation of the transmission.

Cost to Fix P0746 Chevrolet

The typical repair costs for addressing the P0746 code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing a transmission control solenoid valve can range from $150 to $400, including parts and labor. Additional costs may apply if other components need to be replaced or if the transmission control module requires reprogramming. It is advisable to consult with a professional mechanic or auto repair shop for a more accurate estimate based on the vehicle's make and model, as well as the local labor rates.

What does this mean?

Tech Notes for P0746 Chevrolet

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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Information for Specific Chevrolet Models

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 Chevrolet Code

1. What are the common symptoms of OBDII code P0746 in a Chevrolet related to the Transmission Control Solenoid Valve 1 Stuck Off?

The common symptoms include harsh shifting, transmission slipping, poor fuel economy, and the transmission staying in "limp mode."

2. What are the possible causes of OBDII code P0746 in a Chevrolet indicating an issue with Transmission Control Solenoid Valve 1 Stuck Off?

Possible causes include a faulty transmission control solenoid, low transmission fluid, dirty transmission fluid, or a wiring issue.

3. How serious is OBDII code P0746 in a Chevrolet due to Transmission Control Solenoid Valve 1 Stuck Off?

This code should be taken seriously as it can lead to further damage to the transmission if left unrepaired. It is recommended to address the issue promptly.

4. Can I continue driving my Chevrolet with OBDII code P0746 related to Transmission Control Solenoid Valve 1 Stuck Off?

It is not recommended to continue driving the vehicle with this code as it can cause further damage to the transmission. It's best to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose OBDII code P0746 in a Chevrolet indicating a problem with Transmission Control Solenoid Valve 1 Stuck Off?

Diagnosis usually involves using a scan tool to read the code, checking the transmission fluid level and condition, and inspecting the wiring and connectors related to the transmission control solenoid.

6. What are some repair tips for fixing OBDII code P0746 in a Chevrolet due to Transmission Control Solenoid Valve 1 Stuck Off?

Repair tips may include replacing the faulty transmission control solenoid, performing a transmission fluid flush and filter change, checking and repairing any damaged wiring, and resetting the trouble code.

7. How much does it typically cost to repair OBDII code P0746 related to Transmission Control Solenoid Valve 1 Stuck Off in a Chevrolet?

The cost of repair can vary depending on the exact cause of the issue and labor rates in your area. It's best to consult a professional mechanic for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P0746 in a Chevrolet by themselves?

While some experienced DIY enthusiasts may be able to tackle the repair, dealing with transmission issues can be complex. It's recommended to seek the help of a professional mechanic for this type of repair.

9. Are there any preventive measures to avoid OBDII code P0746 in a Chevrolet due to Transmission Control Solenoid Valve 1 Stuck Off?

Regular maintenance, such as checking and changing the transmission fluid as recommended by the manufacturer, can help prevent issues like this code from occurring.

10. Will resetting the OBDII code P0746 related to Transmission Control Solenoid Valve 1 Stuck Off in a Chevrolet make the problem go away?

Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to return. It's important to diagnose and fix the root cause of the problem.

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