AutoCodes – Mitsubishi – P0748 Mitsubishi

P0748 Mitsubishi Code - Line Pressure Linear Solenoid Valve System

Quick Answer

The Pressure Control (PC) Solenoid Valve an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. Common causes include Faulty line pressure solenoid valve, Line pressure solenoid valve harness is open or shorted, Line pressure solenoid valve circuit poor electrical connection. 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 solenoid valve, Line pressure solenoid valve harness is open or shorted, Line pressure solenoid valve circuit poor electrical connection.
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.

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Code Popularity 5,072

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 29, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0748 Mitsubishi Description

The Pressure Control (PC) Solenoid Valve an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. As current flow is increased, the magnetic field produced by the coil moves the solenoid’s plunger further away from the exhaust port. Opening the exhaust port decreases the output fluid pressure regulated by the PC solenoid valve, which ultimately decreases line pressure. The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM).

OBDII Code P0748 Mitsubishi - Line Pressure Linear Solenoid Valve System - AutoCodes.com — P0748 Mitsubishi Code - Line Pressure Linear Solenoid Valve System

What does this mean?

What are the Possible Causes of the DTC P0748 Mitsubishi?

Faulty line pressure solenoid valve
Line pressure solenoid valve harness is open or shorted
Line pressure solenoid valve circuit poor electrical connection
Low transmission fluid level
Dirty transmission fluid

How to Fix the DTC P0748 Mitsubishi?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0748 Mitsubishi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.