Engine-Codes - Scion - P0748 Scion

P0748 Scion Code - Pressure Control Solenoid 'A' Electrical

- Code Popularity: 3,966 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P0748 Scion?

  • 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 P0748 Scion Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Code P0748 Scion 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.

|What is the Cost to Diagnose the Code P0748 Scion?

Labor: 1.0

The cost to diagnose the P0748 Scion code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code P0748 Scion Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Transmission shift shock

|What Does the P0748 Scion Code Mean?

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.
P0748 Scion Code - Pressure Control Solenoid 'A' Electrical

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