AutoCodes – MINI – P0748 MINI

P0748 MINI Code - Pressure Control Solenoid 'A' Performance

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 Dirty transmission fluid, Low transmission fluid level, Faulty line pressure solenoid valve 'A'. 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 MINI indicates Pressure Control Solenoid 'A' Performance.
Common causes: Common causes include Dirty transmission fluid, Low transmission fluid level, Faulty line pressure solenoid valve 'A'.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,580

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0748 MINI 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 MINI - Pressure Control Solenoid 'A' Performance - AutoCodes.com — P0748 MINI Code - Pressure Control Solenoid 'A' Performance

What does this mean?

What are the Possible Causes of the DTC P0748 MINI?

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

How to Fix the DTC P0748 MINI?

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 MINI 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.

Need more information about the P0748 MINI code?

Need more information on how to fix the P0748 MINI code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0748 MINI code diagnosed by a professional: Find a repair shop in your area

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 MINI Code

1. What are the common symptoms of OBDII code P0748 in a MINI?

- Common symptoms include harsh shifting, transmission slipping, decreased fuel efficiency, and potential transmission overheating.

2. What can cause the OBDII code P0748 in a MINI?

- The code can be triggered by a faulty pressure control solenoid 'A', low transmission fluid levels, a clogged transmission filter, or internal transmission issues.

3. How serious is the OBDII code P0748 in a MINI?

- Ignoring this code can lead to further damage to the transmission system, potentially resulting in complete transmission failure if not addressed promptly.

4. Can I continue driving my MINI with the OBDII code P0748 present?

- It is not recommended to continue driving your MINI with this code present, as it can cause further damage to the transmission and lead to costly repairs.

5. How do I diagnose the OBDII code P0748 in a MINI?

- Diagnosing this code typically involves using a scan tool to check for the code, inspecting the transmission fluid level and condition, and performing a thorough inspection of the transmission system.

6. Can I repair the OBDII code P0748 in a MINI myself?

- While some DIY enthusiasts may attempt to replace the pressure control solenoid 'A' themselves, it is recommended to have a professional mechanic diagnose and repair this issue due to the complexity of transmission systems.

7. How much does it cost to repair the OBDII code P0748 in a MINI?

- The cost of repairing this code can vary depending on the underlying issue, but it typically ranges from $200 to $800, including parts and labor.

8. Are there any temporary solutions for the OBDII code P0748 in a MINI?

- There are no recommended temporary solutions for this code, as it is crucial to address the underlying issue promptly to prevent further damage to the transmission.

9. How long does it take to repair the OBDII code P0748 in a MINI?

- The repair time for this code can vary depending on the extent of the issue and the availability of parts, but it typically takes a few hours to a full day for a mechanic to address the problem.

10. Can the OBDII code P0748 in a MINI reoccur after repair?

- If the underlying issue is not completely addressed during the repair, there is a possibility that the code may reoccur. It is important to ensure that all potential causes are properly diagnosed and resolved to prevent a recurrence.