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Engine-Codes – Generic – P0748

P0748 Code - Pressure Control Solenoid 'A' Electrical

Quick Answer

The P0748 code indicates a problem with the Pressure Control Solenoid 'A' electrical circuit in the transmission. Common causes include Faulty pressure control solenoid 'A', Damaged wiring or connectors, Low transmission fluid levels. 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
P0748 indicates Pressure Control Solenoid 'A' Electrical.
Common causes
Common causes include Faulty pressure control solenoid 'A', Damaged wiring or connectors, Low transmission fluid levels.
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 07, 2024
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Code P0748 Description

The P0748 code indicates a problem with the Pressure Control Solenoid 'A' electrical circuit in the transmission. This solenoid is responsible for regulating the hydraulic pressure within the transmission, which is crucial for proper shifting and overall performance. When this solenoid malfunctions, it can lead to issues such as harsh shifting, erratic shifting patterns, or even transmission slippage.

OBDII Code P0748 - Pressure Control Solenoid 'A' Electrical
P0748 Code - Pressure Control Solenoid 'A' Electrical

Common Causes of P0748

  1. Faulty pressure control solenoid 'A'
  2. Damaged wiring or connectors
  3. Low transmission fluid levels
  4. Transmission fluid contamination
  5. Issues with the transmission control module

Symptoms of P0748

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

How to Fix P0748

  1. Diagnose the issue by using a scan tool to retrieve the trouble code and perform a visual inspection of the solenoid and its wiring.
  2. Test the pressure control solenoid 'A' for proper resistance and continuity using a multimeter.
  3. Replace the pressure control solenoid 'A' if it fails the electrical tests.
  4. Inspect and repair any damaged wiring or connectors related to the solenoid.
  5. Refill the transmission fluid to the proper level and check for any leaks or contamination.

Cost to Fix P0748

The typical repair costs for addressing a P0748 code can range from $200 to $500, depending on the extent of the damage and the specific parts that need to be replaced. This estimate includes both parts and labor costs. It is important to note that the actual repair costs can vary significantly based on factors such as the vehicle's make and model, the location of the repair shop, and the technician's hourly labor rates. It is recommended to obtain multiple quotes from different repair shops to ensure a competitive price.

What does this mean?

Tech Notes for P0748

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?

Engine Control Module (ECM) detectes an open or shorted condition on the solenoid circuit

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Code P0748 Information for Specific Makes

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 P0748 Code

No Frequently Asked Questions about P0748 Code found.

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  • hi, i have a volkswagen jetta 2003 model, and the symptoms on my car for this code is that the transmission doesnt select at all, even when the car is on high speed. it has the po743 and po748 codes, pls advise on what needs to be done. thanks.

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  • Have your tried clearing the codes? have you checked the transmission fluid level and condition? You have a problem with the shift solenoids and you may have replace the solenoid to fix the problem.

    Reply to Comment