Engine-Codes.com
Engine-Codes – BMW – P0748 BMW

P0748 BMW Code - Pressure Control Solenoid 'A' Performance

Quick Answer

The P0748 BMW code indicates an issue with the Pressure Control Solenoid 'A', specifically related to its performance. Common causes include Faulty pressure control solenoid 'A', Electrical issues such as a short circuit or wiring damage, 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 BMW indicates Pressure Control Solenoid 'A' Performance.
Common causes
Common causes include Faulty pressure control solenoid 'A', Electrical issues such as a short circuit or wiring damage, 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 09, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0748 BMW Description

The P0748 BMW code indicates an issue with the Pressure Control Solenoid 'A', specifically related to its performance. The pressure control solenoid is a crucial component of the transmission system responsible for regulating fluid pressure to ensure smooth gear shifting. When this solenoid malfunctions or fails to perform adequately, it can lead to a variety of transmission problems and affect the vehicle's overall performance.

OBDII Code P0748 BMW - Pressure Control Solenoid 'A' Performance
P0748 BMW Code - Pressure Control Solenoid 'A' Performance

Common Causes of P0748 BMW

  1. Faulty pressure control solenoid 'A'
  2. Electrical issues such as a short circuit or wiring damage
  3. Low transmission fluid levels or contaminated fluid
  4. Mechanical problems within the transmission system
  5. Software or programming issues in the transmission control module

Symptoms of P0748 BMW

  1. Delayed or erratic shifting
  2. Harsh or rough gear changes
  3. Transmission slipping
  4. Engine stalling or hesitation
  5. Illumination of the Check Engine Light

How to Fix P0748 BMW

  1. Begin by conducting a thorough diagnostic scan to confirm the P0748 code and identify any other related issues.
  2. Inspect the pressure control solenoid 'A' for any signs of damage or wear, and replace it if necessary.
  3. Check the transmission fluid level and condition, topping up or flushing the fluid if needed.
  4. Test the electrical connections, wiring, and transmission control module for any faults or malfunctions, repairing or replacing components as required.
  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 BMW

The typical repair costs for addressing the P0748 BMW code can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary depending on factors such as the location, vehicle make and model, and engine type. Rates may range from $80 to $150 per hour, with higher rates in metropolitan areas or at dealerships and lower rates at independent shops. It is advisable to obtain local estimates for a more accurate cost assessment.

What does this mean?

Tech Notes for P0748 BMW

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

Need more information about the P0748 BMW code?

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

Need Help with the Code?

Get the P0748 BMW 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 BMW Code

1. What does the OBDII code P0748 mean on a BMW?

P0748 indicates an issue with the Pressure Control Solenoid 'A,' which is responsible for regulating hydraulic pressure in the transmission.

2. What are the common symptoms of P0748 in a BMW?

Symptoms may include harsh shifting, slipping gears, transmission overheating, poor fuel economy, or the vehicle entering limp mode.

3. What causes the P0748 code to appear?

This code can be triggered by a faulty solenoid, low transmission fluid, a clogged transmission filter, damaged wiring, or a failing transmission control module (TCM).

4. Can driving with the P0748 code damage my BMW?

Yes, continuing to drive with this code can lead to further transmission damage, increased repair costs, and unsafe driving conditions.

5. How do you diagnose the P0748 code in a BMW?

Diagnosis involves scanning for codes, checking transmission fluid levels, inspecting wiring and connectors, and testing the functionality of the solenoid and TCM.

6. How is the P0748 code typically fixed?

Repairs may include replacing the faulty solenoid, cleaning or replacing the transmission filter, repairing damaged wiring, or reprogramming/replacing the TCM.

7. Is low transmission fluid a possible cause of the P0748 code?

Yes, low or dirty transmission fluid can cause improper hydraulic pressure, leading to this code.

8. How much does it cost to repair the P0748 code on a BMW?

The cost varies depending on the repair, ranging from $150 for fluid and filter replacement to $1,000 or more for solenoid or TCM replacement.

9. Can I reset the P0748 code without fixing the issue?

You can clear the code with a scan tool, but it will likely return if the underlying issue isn’t resolved.

10. Is the P0748 code unique to BMW vehicles?

No, P0748 is a generic OBDII code that can appear on various makes and models, but the specific symptoms and repair steps may vary by vehicle.

Discuss the causes and fixes for P0748 BMW OBDII Code

Submit a New Comment

Code P0748 BMW comments

No comments found for this page.