AutoCodes – Generic – P0748

P0748 Code - Pressure Control Solenoid 'A' Electrical

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 indicates Pressure Control Solenoid 'A' Electrical.
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.

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Code Popularity 75,062

How popular is this code, among other codes? Medium

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 Sep 11, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P0748 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 - Pressure Control Solenoid 'A' Electrical - AutoCodes.com — P0748 Code - Pressure Control Solenoid 'A' Electrical

What does this mean?

What are the Possible Causes of the DTC P0748?

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?

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 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.

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Information for Specific Makes

P0748 Acura — Pressure Control Solenoid 'A' Circuit System Fault
P0748 Audi — Pressure Control Solenoid 'A' Electrical
P0748 BMW — Pressure Control Solenoid 'A' Performance
P0748 Buick — Pressure Control Solenoid Circuit Electrical
P0748 Cadillac — Pressure Control Solenoid Circuit Electrical
P0748 Chevrolet — Pressure Control Solenoid Circuit Electrical
P0748 Chrysler — Governor Pressure Solenoid Circuit Condition
P0748 Dodge — Governor Pressure Solenoid Circuit Condition
P0748 GMC — Pressure Control Solenoid Circuit Electrical
P0748 Honda — Pressure Control Solenoid 'A' Circuit System Fault
P0748 Hyundai — Pressure Control Solenoid 'A' Electrical
P0748 Isuzu — Faulty Transmission Pressure Control Solenoid
P0748 Jeep — Governor Pressure Solenoid Circuit Condition
P0748 KIA — Linear Solenoid Electric
P0748 Lexus — Pressure Control Solenoid 'A' Electrical
P0748 Mazda — Pressure Control Solenoid 'A' Electrical
P0748 Mercedes-Benz — Pressure Control Solenoid 'A' Electrical
P0748 MINI — Pressure Control Solenoid 'A' Performance
P0748 Mitsubishi — Line Pressure Linear Solenoid Valve System
P0748 Pontiac — Pressure Control Solenoid Circuit Electrical
P0748 Saturn — Pressure Control Solenoid Circuit Electrical
P0748 Scion — Pressure Control Solenoid 'A' Electrical
P0748 Subaru — Pressure Control Solenoid 'A' Electrical
P0748 Suzuki — Pressure Control Solenoid Malfunction
P0748 Toyota — Pressure Control Solenoid 'A' Electrical
P0748 Volkswagen — Pressure Control Solenoid 'A' Electrical
P0748 Volvo — Pressure Control Solenoid 'A' Electrical

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 Code

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Opeyemi Teslim Ogunbadejo
Date: April 4, 2017 at 2:48 pm

hi, i have a volkswagen jetta 2003 model, and the symptoms on my car for this code is that the transmission doesnt select at all, even when the car is on high speed. it has the po743 and po748 codes, pls advise on what needs to be done. thanks.

Reply to Comment
OBDIITech
Date: April 4, 2017 at 8:00 pm

Have your tried clearing the codes? have you checked the transmission fluid level and condition? You have a problem with the shift solenoids and you may have replace the solenoid to fix the problem.

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