AutoCodes – Isuzu – P0748 Isuzu

P0748 Isuzu Code - Faulty Transmission Pressure Control Solenoid

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 Faulty line pressure solenoid valve, Line pressure solenoid valve harness is open or shorted, Line pressure solenoid valve circuit poor electrical connection. 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 Isuzu indicates Faulty Transmission Pressure Control Solenoid.
Common causes: Common causes include Faulty line pressure solenoid valve, Line pressure solenoid valve harness is open or shorted, Line pressure solenoid valve circuit poor electrical connection.
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 16,903

How popular is this code, among other codes? Low

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 Jan 29, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0748 Isuzu 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 Isuzu - Faulty Transmission Pressure Control Solenoid - AutoCodes.com — P0748 Isuzu Code - Faulty Transmission Pressure Control Solenoid

What does this mean?

What are the Possible Causes of the DTC P0748 Isuzu?

Faulty line pressure solenoid valve
Line pressure solenoid valve harness is open or shorted
Line pressure solenoid valve circuit poor electrical connection
Low transmission fluid level
Dirty transmission fluid

How to Fix the DTC P0748 Isuzu?

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 Isuzu 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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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 Isuzu Code

1. What are the common symptoms of a faulty transmission pressure control solenoid (P0748) in an Isuzu vehicle?

Common symptoms include harsh shifting, transmission slipping, erratic shifting patterns, and difficulty engaging gears.

2. What can cause the P0748 OBDII code related to the transmission pressure control solenoid in an Isuzu?

The P0748 code is typically triggered by a faulty transmission pressure control solenoid, wiring issues, low transmission fluid, or a defective transmission control module.

3. How serious is a P0748 OBDII code related to the transmission pressure control solenoid in an Isuzu?

Ignoring the P0748 code can lead to further damage to the transmission, potentially resulting in complete transmission failure. It is important to address the issue promptly.

4. Can I continue driving my Isuzu with a P0748 OBDII code related to the transmission pressure control solenoid?

It is not recommended to continue driving the vehicle with a P0748 code as it may cause further damage to the transmission. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose the P0748 OBDII code related to the transmission pressure control solenoid in my Isuzu?

Diagnosing the P0748 code typically involves using a scan tool to retrieve the code, checking the transmission fluid level and condition, inspecting the wiring harness for any damage, and testing the transmission pressure control solenoid.

6. What are some repair tips for fixing a P0748 OBDII code related to the transmission pressure control solenoid in an Isuzu?

Repairing a P0748 code often involves replacing the faulty transmission pressure control solenoid, repairing any damaged wiring, ensuring proper transmission fluid levels, and resetting the trouble codes.

7. Can a DIY enthusiast repair a P0748 OBDII code related to the transmission pressure control solenoid in an Isuzu?

While some DIY enthusiasts may have the skills to replace the transmission pressure control solenoid, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is fixed correctly.

8. How much does it typically cost to repair a P0748 OBDII code related to the transmission pressure control solenoid in an Isuzu?

The cost of repairing a P0748 code can vary depending on the extent of the issue and labor rates. On average, the repair cost can range from $200 to $500, including parts and labor.

9. Will resetting the OBDII code fix the issue related to the transmission pressure control solenoid in my Isuzu?

Resetting the OBDII code may temporarily clear the warning light, but it will not fix the underlying issue causing the P0748 code. It is essential to diagnose and repair the root cause of the problem.

10. How can I prevent the P0748 OBDII code related to the transmission pressure control solenoid from occurring in my Isuzu?

To prevent the P0748 code, it is crucial to maintain regular transmission fluid checks and changes, avoid harsh driving habits, address any transmission issues promptly, and have the vehicle inspected regularly by a qualified mechanic.