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Engine-Codes – Mitsubishi – P0748 Mitsubishi

P0748 Mitsubishi Code - Line Pressure Linear Solenoid Valve System

Quick Answer

The P0748 code in a Mitsubishi vehicle relates to an issue with the Line Pressure Linear Solenoid Valve system. Common causes include Faulty Line Pressure Linear Solenoid Valve, Electrical issues such as a short circuit or open circuit in the solenoid wiring, Low transmission fluid levels 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
P0748 Mitsubishi indicates Line Pressure Linear Solenoid Valve System.
Common causes
Common causes include Faulty Line Pressure Linear Solenoid Valve, Electrical issues such as a short circuit or open circuit in the solenoid wiring, Low transmission fluid levels 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 12, 2024
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Code P0748 Mitsubishi Description

The P0748 code in a Mitsubishi vehicle relates to an issue with the Line Pressure Linear Solenoid Valve system. This system is responsible for controlling the hydraulic pressure within the transmission, which is crucial for proper shifting and overall transmission performance. The linear solenoid valve is an electromechanical component that helps regulate the pressure of transmission fluid, ensuring smooth gear changes and optimal performance.

OBDII Code P0748 Mitsubishi - Line Pressure Linear Solenoid Valve System
P0748 Mitsubishi Code - Line Pressure Linear Solenoid Valve System

Common Causes of P0748 Mitsubishi

  1. Faulty Line Pressure Linear Solenoid Valve
  2. Electrical issues such as a short circuit or open circuit in the solenoid wiring
  3. Low transmission fluid levels or contaminated fluid
  4. Clogged transmission filter
  5. Mechanical damage to the solenoid valve or transmission components

Symptoms of P0748 Mitsubishi

  1. Rough or harsh shifting
  2. Delayed engagement when shifting gears
  3. Transmission slipping
  4. Transmission overheating
  5. Illumination of the Check Engine Light

How to Fix P0748 Mitsubishi

  1. Begin by conducting a thorough diagnosis of the transmission system to pinpoint the exact cause of the issue.
  2. Inspect the Line Pressure Linear Solenoid Valve for any signs of damage or wear. Replace the solenoid if necessary.
  3. Check the transmission fluid level and condition. Perform a transmission fluid flush and filter replacement if needed.
  4. Test the electrical connections and wiring associated with the solenoid valve. Repair any faults or replace damaged wiring.
  5. Clear the diagnostic trouble codes, reset the transmission adaptations, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0748 Mitsubishi

The cost of repairing a P0748 code in a Mitsubishi vehicle can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the parts for this repair can range from $100 to $300, while labor costs may range from $150 to $400. Overall, the total repair cost for addressing this issue could fall within the range of $250 to $700. It is important to note that these are rough estimates, and actual costs may differ based on the specific circumstances of the vehicle and the chosen repair shop. It is advisable to consult with a professional mechanic to obtain a more accurate cost estimate for this repair.

What does this mean?

Tech Notes for P0748 Mitsubishi

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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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 Mitsubishi Code

1. What are the common symptoms of OBDII code P0748 in a Mitsubishi related to the Line Pressure Linear Solenoid Valve System?

- Common symptoms include harsh shifting, erratic transmission behavior, and potential transmission slippage.

2. What causes OBDII code P0748 in a Mitsubishi?

- The code is typically triggered by a faulty Line Pressure Linear Solenoid Valve or issues with the wiring or connectors related to the valve.

3. How can I diagnose the Line Pressure Linear Solenoid Valve System in my Mitsubishi when OBDII code P0748 is present?

- Diagnosing the system involves checking the valve for proper operation, inspecting the wiring and connectors for damage, and testing the transmission fluid pressure.

4. Can a dirty transmission fluid cause OBDII code P0748 to appear in a Mitsubishi?

- Yes, contaminated or dirty transmission fluid can affect the proper functioning of the Line Pressure Linear Solenoid Valve, leading to the triggering of the code.

5. What are the potential repair options for addressing OBDII code P0748 in a Mitsubishi?

- Repair options may include replacing the Line Pressure Linear Solenoid Valve, repairing any damaged wiring or connectors, and performing a transmission fluid flush and filter replacement.

6. Is it safe to continue driving my Mitsubishi with OBDII code P0748 present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further transmission damage and potential safety hazards.

7. Can a DIY enthusiast tackle the repair of OBDII code P0748 in a Mitsubishi?

- While some aspects of the repair, such as checking wiring connections, can be done by a DIY enthusiast, diagnosing and replacing the Line Pressure Linear Solenoid Valve may require professional expertise.

8. How much does it typically cost to repair OBDII code P0748 in a Mitsubishi at a mechanic or dealership?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay anywhere from $200 to $500 for parts and labor for this repair.

9. Are there any preventive maintenance tips to avoid OBDII code P0748 in a Mitsubishi?

- Regular transmission fluid changes, avoiding harsh driving habits, and promptly addressing any transmission issues can help prevent the occurrence of this code.

10. Will resetting the OBDII code P0748 in my Mitsubishi make it go away permanently?

- Resetting the code may temporarily clear the warning, but if the underlying issue with the Line Pressure Linear Solenoid Valve System is not addressed, the code is likely to reappear.

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