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P0747 Mazda Code - Pressure Control Solenoid 'A' Stuck On

Quick Answer

The P0747 diagnostic trouble code (DTC) for Mazda vehicles indicates an issue with the Pressure Control Solenoid 'A' being stuck on. Common causes include Electrical issues such as a faulty wiring harness or connections, Mechanical failure within the solenoid itself, Internal blockages affecting the solenoid's function. 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 Mazda indicates Pressure Control Solenoid 'A' Stuck On.
Common causes
Common causes include Electrical issues such as a faulty wiring harness or connections, Mechanical failure within the solenoid itself, Internal blockages affecting the solenoid's function.
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 12, 2024
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Code P0747 Mazda Description

The P0747 diagnostic trouble code (DTC) for Mazda vehicles indicates an issue with the Pressure Control Solenoid 'A' being stuck on. This solenoid is an essential component of the transmission system, responsible for regulating the hydraulic pressure that controls the shifting of gears. When this solenoid gets stuck in the "on" position, it can result in various performance issues and potential long-term consequences if left unaddressed.

OBDII Code P0747 Mazda - Pressure Control Solenoid 'A' Stuck On
P0747 Mazda Code - Pressure Control Solenoid 'A' Stuck On

Common Causes of P0747 Mazda

  1. Electrical issues such as a faulty wiring harness or connections
  2. Mechanical failure within the solenoid itself
  3. Internal blockages affecting the solenoid's function
  4. Low transmission fluid levels or dirty fluid
  5. General wear and tear on the transmission system

Symptoms of P0747 Mazda

  1. Harsh or delayed shifting
  2. Decreased fuel efficiency
  3. Rough acceleration
  4. Transmission slipping
  5. Transmission failure to engage

How to Fix P0747 Mazda

  1. Begin by diagnosing the issue using a scan tool to confirm the P0747 code and identify the specific cause of the solenoid being stuck on.
  2. Inspect the wiring harness and connections for any damage or corrosion, repairing or replacing as necessary.
  3. Check the transmission fluid levels and condition, topping off or performing a fluid flush if needed.
  4. Replace the Pressure Control Solenoid 'A' if it is determined to be faulty, ensuring proper installation and connection.
  5. Clear the DTC and test drive the vehicle to confirm that the issue has been resolved and that the transmission is functioning correctly.

Cost to Fix P0747 Mazda

The cost of repairing a Pressure Control Solenoid 'A' stuck on issue can vary depending on the specific make and model of the Mazda vehicle, the location of the repair shop, and any additional parts or labor required. On average, the cost of replacing the solenoid itself can range from $200 to $500, with additional costs for diagnostic time, fluid flushes, or other necessary repairs. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can be higher at dealerships or in metropolitan areas. It is advisable to consult with a trusted mechanic or repair shop for a more accurate estimate based on individual circumstances.

What does this mean?

Tech Notes for P0747 Mazda

When a transmission solenoid is 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 removing 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.

When is the Code Detected?

The gear required by the Engine Control Module (ECM) does not match the actual gear when driving

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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 Mazda Code

1. What does the OBDII code P0747 mean on a Mazda?

P0747 indicates that the Pressure Control Solenoid 'A' in the transmission is stuck in the "on" position, causing improper fluid pressure regulation.

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

Symptoms may include harsh or erratic shifting, transmission slipping, reduced fuel efficiency, or the vehicle going into limp mode.

3. What causes the P0747 code to trigger on a Mazda?

The code is typically caused by a malfunctioning pressure control solenoid, dirty or degraded transmission fluid, or internal transmission issues like blockages or mechanical wear.

4. Can bad transmission fluid cause the P0747 code on a Mazda?

Yes, old or contaminated transmission fluid can lead to blockages or improper solenoid function, which may trigger the P0747 code.

5. How do you diagnose the P0747 code on a Mazda?

Diagnosis involves checking the transmission fluid condition, testing the pressure control solenoid for electrical faults, and inspecting the wiring harness and connectors for damage.

6. Is it safe to drive a Mazda with the P0747 code?

Driving with this code is not recommended, as it can lead to further transmission damage, poor performance, and unsafe driving conditions.

7. How do you fix the P0747 code on a Mazda?

Repairs may include replacing the faulty pressure control solenoid, flushing and replacing the transmission fluid, repairing wiring issues, or addressing internal transmission damage.

8. How much does it cost to fix the P0747 code on a Mazda?

Repair costs can range from $150 to $400 for solenoid replacement, but may be higher if transmission rebuilding or replacement is needed.

9. Can I clear the P0747 code without fixing the issue?

Clearing the code without addressing the root cause will only result in the code returning and may worsen the underlying issue.

10. What should I do if my Mazda triggers the P0747 code repeatedly?

If the code persists after repairs, consult a professional mechanic to inspect for deeper transmission issues or errors in the initial diagnosis.

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