Engine-Codes - Toyota - P0748 TOYOTA

P0748 TOYOTA Code - Pressure Control Solenoid 'A' Electrical

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|P0748 TOYOTA code possible causes

  • 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 is the P0748 TOYOTA code repair?

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.

|P0748 TOYOTA 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.

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 P0748 TOYOTA code

Labor: 1.0

The cost to diagnose the P0748 TOYOTA 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.

|When is the P0748 TOYOTA code detected?

Engine Control Module (ECM) detectes an open or shorted condition on the solenoid circuit

|What are P0748 TOYOTA code possible symptoms?

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

|What is P0748 TOYOTA code meaning?

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).

|Need more information with the P0748 TOYOTA code?

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