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P0747 Chevrolet 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 Chevrolet 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 9,747
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Aug 02, 2022
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Code P0747 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 P0747 Chevrolet - Transmission Control Solenoid Valve 1 Stuck On - AutoCodes.com
P0747 Chevrolet Code - Transmission Control Solenoid Valve 1 Stuck On
What does this mean?

What are the Possible Causes of the DTC P0747 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 P0747 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.





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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0747 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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Need Help with the Code?

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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 P0747 Chevrolet Code

1. What does OBDII code P0747 mean on a Chevrolet?

Code P0747 indicates that the Transmission Control Solenoid Valve 1 is stuck in the "on" position, which can affect the transmission's ability to function properly.

2. What are the common symptoms of P0747 in a Chevrolet?

Symptoms may include harsh or delayed shifting, inability to shift gears, transmission slipping, decreased fuel efficiency, or the vehicle entering limp mode.

3. What causes the P0747 code to trigger in a Chevrolet?

Common causes include a faulty transmission control solenoid, low or dirty transmission fluid, internal transmission issues, or damaged wiring and connectors in the transmission circuit.

4. How is P0747 diagnosed in a Chevrolet?

A mechanic will use a scan tool to confirm the code, inspect the transmission fluid condition, check the wiring and connectors, and test the solenoid's functionality with specialized diagnostic equipment.

5. Can I drive my Chevrolet with a P0747 code?

It’s not recommended to drive with this code active, as it can lead to further transmission damage and may leave the vehicle stuck in a single gear or limp mode.

6. How do I fix the P0747 code on a Chevrolet?

Repairs may involve replacing the faulty solenoid, cleaning or replacing the transmission fluid, repairing damaged wiring, or addressing internal transmission issues.

7. How much does it cost to fix a P0747 code in a Chevrolet?

Repair costs can range from $150 to $400 for solenoid replacement, but if transmission rebuilds or replacements are needed, costs could exceed $2,000.

8. Can low transmission fluid cause the P0747 code?

Yes, low or contaminated transmission fluid can cause solenoids to malfunction and trigger this code.

9. How can I prevent the P0747 code from occurring in my Chevrolet?

Regularly check and replace transmission fluid, inspect wiring for damage, and follow the manufacturer’s maintenance schedule to keep the transmission in good condition.

10. Is P0747 a serious issue for my Chevrolet?

Yes, this code indicates a critical transmission issue that should be addressed promptly to avoid further damage and costly repairs.

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