AutoCodes – GMC – P0747 2015 GMC Sierra

P0747 2015 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck On

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: P0747 2015 GMC Sierra indicates Transmission Control Solenoid Valve 1 Stuck On.
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 196

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
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0747 2015 GMC Sierra 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 P0747 2015 GMC Sierra - Transmission Control Solenoid Valve 1 Stuck On - AutoCodes.com — P0747 2015 GMC Sierra Code - Transmission Control Solenoid Valve 1 Stuck On

What does this mean?

What are the Possible Causes of the DTC P0747 2015 GMC Sierra?

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 P0747 2015 GMC Sierra?

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 P0747 2015 GMC Sierra 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.

Need more information about the P0747 2015 GMC Sierra code?

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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 P0747 2015 GMC Sierra Code

1. What does the OBDII code P0747 mean on a 2015 GMC Sierra?

P0747 indicates that Transmission Control Solenoid Valve 1 is stuck in the "On" position, potentially causing shifting issues or transmission performance problems.

2. What are the symptoms of code P0747 in a 2015 GMC Sierra?

Symptoms may include harsh or erratic shifting, the transmission being stuck in one gear, decreased fuel efficiency, and the check engine light illuminating.

3. What causes the P0747 code to appear on a 2015 GMC Sierra?

Common causes include a faulty transmission control solenoid, dirty or low transmission fluid, internal transmission damage, or an electrical issue such as damaged wiring or connectors.

4. Can I drive my 2015 GMC Sierra with the P0747 code active?

Driving with the P0747 code is not recommended as it can lead to further damage to the transmission and unsafe driving conditions due to shifting issues.

5. How do I diagnose the P0747 code on my 2015 GMC Sierra?

Diagnosis involves checking the transmission fluid level and condition, inspecting wiring and connectors for damage, testing the control solenoid for proper operation, and scanning for additional codes.

6. How much does it cost to fix the P0747 code on a 2015 GMC Sierra?

Repair costs vary depending on the cause. Replacing a transmission control solenoid typically costs between $150 and $400, while more extensive transmission repairs can be significantly more expensive.

7. Can low transmission fluid cause the P0747 code in a 2015 GMC Sierra?

Yes, low or dirty transmission fluid can lead to solenoid malfunctions and trigger the P0747 code. Ensuring proper fluid levels and condition is important.

8. Do I need to replace the transmission if the P0747 code is active on my 2015 GMC Sierra?

Not necessarily. The issue might be resolved by replacing the solenoid, cleaning the valve body, or fixing electrical problems. A full transmission replacement is typically a last resort.

9. How can I prevent the P0747 code from occurring in my 2015 GMC Sierra?

Regularly maintain the transmission by checking fluid levels, changing the fluid and filter as recommended, and addressing any transmission issues promptly.

10. Is the P0747 code covered under warranty for a 2015 GMC Sierra?

It depends on the type and duration of your warranty. Powertrain warranties may cover transmission-related issues, but it's best to check with your dealer or manufacturer.