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P0747 Mercedes-Benz Code - Pressure Control Solenoid 'A' Stuck On

Quick Answer

The P0747 code for Mercedes-Benz indicates a problem with the Pressure Control Solenoid 'A' being stuck on. Common causes include Faulty pressure control solenoid 'A', Electrical issues such as a short circuit or faulty wiring, Mechanical problems like a stuck valve or debris blocking the solenoid. 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 Mercedes-Benz indicates Pressure Control Solenoid 'A' Stuck On.
Common causes
Common causes include Faulty pressure control solenoid 'A', Electrical issues such as a short circuit or faulty wiring, Mechanical problems like a stuck valve or debris blocking the solenoid.
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 Mercedes-Benz Description

The P0747 code for Mercedes-Benz indicates a problem with the Pressure Control Solenoid 'A' being stuck on. The pressure control solenoid is a crucial component of the transmission system that helps regulate the hydraulic pressure within the transmission. When this solenoid gets stuck in the on position, it can lead to various issues with the transmission's operation.

OBDII Code P0747 Mercedes-Benz - Pressure Control Solenoid 'A' Stuck On
P0747 Mercedes-Benz Code - Pressure Control Solenoid 'A' Stuck On

Common Causes of P0747 Mercedes-Benz

  1. Faulty pressure control solenoid 'A'
  2. Electrical issues such as a short circuit or faulty wiring
  3. Mechanical problems like a stuck valve or debris blocking the solenoid
  4. Low transmission fluid levels or dirty transmission fluid
  5. Internal transmission damage or wear

Symptoms of P0747 Mercedes-Benz

  1. Harsh or delayed shifting
  2. Transmission slipping
  3. Decreased fuel efficiency
  4. Illumination of the Check Engine Light
  5. Transmission overheating

How to Fix P0747 Mercedes-Benz

  1. Diagnose the issue using a scan tool to confirm the P0747 code and inspect the pressure control solenoid 'A'.
  2. Check the transmission fluid level and condition, topping up or replacing it if necessary.
  3. Test the pressure control solenoid 'A' for proper operation and replace it if it is found to be faulty.
  4. Inspect the wiring and electrical connections related to the solenoid for any damage or corrosion, repairing or replacing them as needed.
  5. Clear the code and test drive the vehicle to ensure that the issue has been resolved and that the transmission is functioning properly.

Cost to Fix P0747 Mercedes-Benz

The cost of repairing a P0747 code for a Mercedes-Benz can vary depending on the specific model of the vehicle, the extent of the damage, and the labor rates in your area. Typically, parts for replacing the pressure control solenoid 'A' can range from $100 to $300, while the labor costs can be anywhere from $150 to $300 or more. Overall, the total repair cost for this issue could range from $250 to $600 or more. It is advisable to consult with a trusted auto repair shop for a more accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for P0747 Mercedes-Benz

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

Need more information about the P0747 Mercedes-Benz 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 Mercedes-Benz Code

1. What does the OBDII code P0747 mean on a Mercedes-Benz?

P0747 indicates that the transmission control module (TCM) has detected that the Pressure Control Solenoid 'A' is stuck in the "on" position, causing potential transmission performance issues.

2. What are the common symptoms of code P0747 in a Mercedes-Benz?

Symptoms may include harsh or delayed shifting, a slipping transmission, reduced fuel efficiency, the transmission being stuck in one gear (limp mode), and the check engine light being illuminated.

3. What causes the P0747 code on a Mercedes-Benz?

Common causes include a faulty pressure control solenoid, low or dirty transmission fluid, clogged transmission passages, wiring issues such as shorts or open circuits, or a malfunctioning transmission control module.

4. Can driving with the P0747 code damage my Mercedes-Benz?

Yes, continuing to drive with this code can lead to further transmission damage, as improper fluid pressure regulation can strain internal components.

5. How can I diagnose the P0747 code on my Mercedes-Benz?

Diagnosis involves using an OBDII scanner to confirm the code, checking the transmission fluid level and condition, inspecting the solenoid and its wiring for damage, and testing the solenoid's functionality with specialized tools.

6. How do I fix the P0747 code on a Mercedes-Benz?

Repairs may involve replacing the pressure control solenoid, flushing and refilling the transmission fluid, repairing or replacing damaged wiring, or, in rare cases, replacing the transmission control module.

7. Is the P0747 code a common issue in Mercedes-Benz vehicles?

While not extremely common, this code can appear in Mercedes-Benz models, especially if the vehicle has high mileage, poor maintenance history, or a known issue with the transmission system.

8. How much does it cost to fix the P0747 code on a Mercedes-Benz?

Repair costs can vary widely depending on the cause, ranging from $150 for a fluid change to $1,000 or more if the solenoid or transmission control module needs replacement.

9. Can low transmission fluid cause the P0747 code in a Mercedes-Benz?

Yes, low or dirty transmission fluid can contribute to this issue by affecting fluid pressure and solenoid operation.

10. Should I clear the P0747 code after repairs on my Mercedes-Benz?

Yes, after completing repairs, you should clear the code with an OBDII scanner and test drive the vehicle to ensure the issue is resolved and the code does not return.

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