AutoCodes – Chevrolet – P0746 Chevrolet

P0746 Chevrolet Code - Transmission Control Solenoid Valve 1 Stuck Off

Quick Answer

The solenoid actuator controls fluid pressure by moving the clutch 1-2-3-4-5-6 regulator valve that controls the fluid pressure to the 1-2-3-4-5-6 clutch. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve. 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 Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve.
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.

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Code Popularity 14,259

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 30, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0746 Chevrolet Description

The solenoid actuator controls fluid pressure by moving the clutch 1-2-3-4-5-6 regulator valve that controls the fluid pressure to the 1-2-3-4-5-6 clutch. The Solenoid Valve is an electronic pressure actuator that controls transmission line pressure based on current flow through its coil windings. As current flow is increased, the magnetic field produced by the coil moves the solenoid’s plunger further away from the exhaust port. Opening the exhaust port decreases the output fluid pressure regulated by the solenoid valve, which ultimately decreases line pressure.

OBDII Code P0746 Chevrolet - Transmission Control Solenoid Valve 1 Stuck Off - AutoCodes.com — P0746 Chevrolet Code - Transmission Control Solenoid Valve 1 Stuck Off

What does this mean?

What are the Possible Causes of the DTC P0746 Chevrolet?

Low transmission fluid level
Dirty transmission fluid
Faulty Transmission Control Solenoid Valve
Transmission Control Solenoid Valve harness is open or shorted
Transmission Control Solenoid Valve circuit poor electrical connection

How to Fix the DTC P0746 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0746 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Chevrolet Models

P0746 2014 Chevrolet Silverado — Transmission Control Solenoid Valve 1 Stuck Off
P0746 2015 Chevrolet Silverado — Transmission Control Solenoid Valve 1 Stuck Off
P0746 2016 Chevrolet Silverado — Transmission Control Solenoid Valve 1 Stuck Off
P0746 2017 Chevrolet Silverado — Transmission Control Solenoid Valve 1 Stuck Off
P0746 2018 Chevrolet Silverado — Transmission Control Solenoid Valve 1 Stuck Off

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.