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P0748 Toyota Code - Pressure Control Solenoid 'A' Electrical

Quick Answer

Changing from 1st to 6th is performed by the Engine Control Module (ECM) turning shift solenoid valves SL1, SL2, SL3, SL4, and SL on and off. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Pressure Control Solenoid 'A' valve (Shift Solenoid Valve SL1). 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 Toyota indicates Pressure Control Solenoid 'A' Electrical.
Common causes
Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Pressure Control Solenoid 'A' valve (Shift Solenoid Valve SL1).
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 41,513
How popular is this code, among other codes? Medium
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Table of contents Created and updated by William Orellana on Sep 11, 2022
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Code P0748 Toyota Description

Changing from 1st to 6th is performed by the Engine Control Module (ECM) turning shift solenoid valves SL1, SL2, SL3, SL4, and SL on and off. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated.
This Diagnostic Trouble Code (DTC) indicates an open or short in the shift solenoid valve SL1 circuit. The ECM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL, and stores the DTC. The ECM also performs the fail-safe function and turns the other normal shift solenoid valves on or off. (In case of an open or short circuit, the ECM stops sending current to the circuit.)
While driving and shifting between the 4th and 5th gears, if the ECM detects an open or short in the shift solenoid valve SL1 circuit, the ECM determines there is a malfunction.
OBDII Code P0748 Toyota - Pressure Control Solenoid 'A' Electrical - AutoCodes.com
P0748 Toyota Code - Pressure Control Solenoid 'A' Electrical
What does this mean?

What are the Possible Causes of the DTC P0748 Toyota?

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty Pressure Control Solenoid 'A' valve (Shift Solenoid Valve SL1)
  • Pressure Control Solenoid 'A' valve harness is open or shorted
  • Pressure Control Solenoid 'A' valve circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0748 Toyota?

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 malfunction, 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, remove 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.

There is a Factory Service Bulletin for the 2004 Toyota Sienna
2004 Toyota Sienna Factory Service Bulletin OBDII Code P0748

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0748 Toyota 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 Toyota code?

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

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

Information for Specific Toyota Models

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 Toyota Code

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

- Common symptoms include harsh shifting, transmission slipping, poor fuel economy, and the Check Engine Light illuminating.

2. What does OBDII code P0748 Toyota indicate?

- OBDII code P0748 indicates a problem with the Pressure Control Solenoid 'A' electrical circuit in the transmission.

3. What are the possible causes of OBDII code P0748 in a Toyota?

- Possible causes include a faulty pressure control solenoid 'A', wiring issues, a defective transmission control module, or a low transmission fluid level.

4. How can I diagnose OBDII code P0748 in my Toyota?

- Diagnosis involves using a scan tool to retrieve the trouble code, checking the transmission fluid level and condition, and inspecting the wiring and connections related to the pressure control solenoid 'A'.

5. Can I continue driving my Toyota with OBDII code P0748?

- It is not recommended to continue driving with OBDII code P0748 as it can lead to further damage to the transmission and potentially result in a costly repair.

6. How do I repair OBDII code P0748 in my Toyota?

- Repair typically involves replacing the pressure control solenoid 'A', repairing any damaged wiring or connections, and clearing the trouble code from the vehicle's computer.

7. Is it possible to reset OBDII code P0748 in a Toyota without repairs?

- While clearing the trouble code may temporarily turn off the Check Engine Light, it is important to address the underlying issue causing OBDII code P0748 to prevent further transmission problems.

8. How much does it cost to fix OBDII code P0748 in a Toyota?

- The cost of fixing OBDII code P0748 can vary depending on the specific issue, but it may range from $200 to $600 for parts and labor.

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

- Regularly checking and maintaining the transmission fluid level, servicing the transmission at recommended intervals, and addressing any transmission-related symptoms promptly can help prevent OBDII code P0748.

10. Can a DIY enthusiast fix OBDII code P0748 in a Toyota?

- While some DIY enthusiasts may have the skills to replace the pressure control solenoid 'A' or address wiring issues, it is recommended to seek professional help for accurate diagnosis and repair of OBDII code P0748.

Discuss the causes and fixes for P0748 Toyota OBDII Code

Submit a New Comment

  • Buenas noches sería muy bueno si los códigos de herror estuvieran acompañados de un diagrama de ubicación d la pieza en el motor

    Reply to Comment

  • Gracias por su commentario, el problema es que cada modelo tienen los componentes en diferentes locaciones, y son muchos para ponerlos. Que modelo y año de Toyota tiene?
    Pressure Control Solenoids are regularmente a dentro de la transmision.

    Reply to Comment

  • Please my Toyota Camry have a problem as gear not slecting on 2010 Camry 22pin gearbox pls any help

    Reply to Comment
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