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P0747 Chevrolet Code - Transmission Control Solenoid Valve 1 Stuck On

Quick Answer

The P0747 code for Chevrolet vehicles indicates a problem with the Transmission Control Solenoid Valve 1 being stuck on. Common causes include Faulty transmission control solenoid valve, Electrical issues such as a short or open circuit, Low transmission fluid level or contaminated fluid. 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 Faulty transmission control solenoid valve, Electrical issues such as a short or open circuit, Low transmission fluid level or contaminated fluid.
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 10, 2024
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Code P0747 Chevrolet Description

The P0747 code for Chevrolet vehicles indicates a problem with the Transmission Control Solenoid Valve 1 being stuck on. The transmission control solenoid is responsible for regulating the flow of transmission fluid in the transmission system. When this solenoid valve gets stuck in the open position, it can cause issues with gear shifting, transmission performance, and overall drivability of the vehicle.

OBDII Code P0747 Chevrolet - Transmission Control Solenoid Valve 1 Stuck On
P0747 Chevrolet Code - Transmission Control Solenoid Valve 1 Stuck On

Common Causes of P0747 Chevrolet

  1. Faulty transmission control solenoid valve
  2. Electrical issues such as a short or open circuit
  3. Low transmission fluid level or contaminated fluid
  4. Mechanical issues within the transmission system
  5. Wiring harness issues or connection problems

Symptoms of P0747 Chevrolet

  1. Erratic shifting or harsh shifting
  2. Transmission slipping
  3. Delayed engagement when shifting gears
  4. Decreased fuel efficiency
  5. Illuminated check engine light

How to Fix P0747 Chevrolet

  1. Diagnose the specific cause of the P0747 code using a diagnostic scanner and performing a thorough inspection of the transmission system.
  2. Replace the Transmission Control Solenoid Valve 1 if it is found to be faulty.
  3. Check and replace any damaged wiring or connections related to the transmission control solenoid.
  4. Inspect and refill the transmission fluid to the proper level if low or contaminated.
  5. Clear the code from the vehicle's computer using the diagnostic scanner and test drive the vehicle to ensure proper operation.

Cost to Fix P0747 Chevrolet

The typical repair costs for addressing a P0747 code on a Chevrolet vehicle can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to inquire with local auto repair shops to get a more accurate estimate for the repair. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

What does this mean?

Tech Notes for P0747 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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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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