AutoCodes – Mazda – P0748 Mazda

P0748 Mazda 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 Mazda 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 8,050

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 Mazda 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 Mazda - Pressure Control Solenoid 'A' Electrical - AutoCodes.com — P0748 Mazda Code - Pressure Control Solenoid 'A' Electrical

What does this mean?

What are the Possible Causes of the DTC P0748 Mazda?

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 Mazda?

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 Mazda 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 Mazda Code

1. What does OBDII code P0748 mean on a Mazda?

P0748 indicates an electrical issue with the Pressure Control Solenoid 'A,' which regulates transmission fluid pressure for optimal shifting performance.

2. What are the common symptoms of a P0748 code on a Mazda?

Symptoms include harsh or erratic shifting, transmission slipping, poor acceleration, and sometimes the vehicle entering limp mode.

3. What causes the P0748 code to appear on a Mazda?

Common causes include a faulty pressure control solenoid, damaged wiring or connectors, low transmission fluid, or a malfunctioning transmission control module (TCM).

4. How do I diagnose the P0748 code on a Mazda?

Start by checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and testing the solenoid with a multimeter for proper resistance.

5. Can I drive my Mazda with a P0748 code?

Driving with this code is not recommended as it can lead to further transmission damage and unsafe driving conditions due to erratic shifting.

6. How do I fix the P0748 code on a Mazda?

Repairs may include replacing the pressure control solenoid, repairing damaged wiring or connectors, flushing and refilling transmission fluid, or reprogramming or replacing the TCM.

7. What tools are needed to fix a P0748 code on a Mazda?

You may need an OBDII scanner, a multimeter for electrical testing, basic hand tools, and potentially a transmission fluid flush kit.

8. How much does it cost to fix a P0748 code on a Mazda?

Costs vary depending on the repair, but replacing a pressure control solenoid typically ranges from $200 to $500, while wiring repairs may cost less.

9. Can low transmission fluid cause the P0748 code on a Mazda?

Yes, low or contaminated transmission fluid can cause insufficient hydraulic pressure, triggering the P0748 code.

10. Does the P0748 code mean I need a new transmission?

Not necessarily. In most cases, the issue is related to the solenoid, wiring, or fluid, which can be repaired or replaced without replacing the entire transmission.