AutoCodes – Suzuki – P0748 Suzuki

P0748 Suzuki Code - Pressure Control Solenoid Malfunction

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 Suzuki indicates Pressure Control Solenoid Malfunction.
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 10,074

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 Suzuki 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 Suzuki - Pressure Control Solenoid Malfunction - AutoCodes.com — P0748 Suzuki Code - Pressure Control Solenoid Malfunction

What does this mean?

What are the Possible Causes of the DTC P0748 Suzuki?

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 Suzuki?

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 Suzuki 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 Suzuki Code

1. What does the OBDII code P0748 mean on a Suzuki?

P0748 indicates a malfunction in the pressure control solenoid circuit, which helps regulate hydraulic pressure in the transmission for smooth shifting.

2. What are common symptoms of P0748 in a Suzuki?

Symptoms may include harsh or erratic shifting, transmission slipping, poor fuel economy, and the activation of the check engine light (CEL).

3. What causes the P0748 code to appear in a Suzuki?

Common causes include a faulty pressure control solenoid, wiring or connector issues in the solenoid circuit, low transmission fluid, or a malfunctioning transmission control module (TCM).

4. Can driving with the P0748 code damage my Suzuki?

Yes, driving with this code can cause further damage to the transmission if left unaddressed, especially if shifting issues or overheating occur.

5. How can I diagnose the P0748 code on my Suzuki?

Start by checking the transmission fluid level and condition, inspect the wiring and connectors for damage, and test the pressure control solenoid for proper operation using a multimeter.

6. How is the P0748 code typically fixed in a Suzuki?

Repairs may involve replacing the pressure control solenoid, repairing or replacing damaged wiring, cleaning or replacing connectors, or reprogramming the TCM if needed.

7. Can low transmission fluid trigger the P0748 code in my Suzuki?

Yes, low or contaminated transmission fluid can cause improper solenoid operation, leading to this code.

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

Repair costs vary but may range from $150-$400 for solenoid replacement, with additional costs if wiring or TCM repairs are needed.

9. Do I need to replace the entire transmission if I get the P0748 code?

Not necessarily. This code usually points to a specific solenoid or circuit issue, which can often be repaired without replacing the entire transmission.

10. Can a bad battery cause the P0748 code on a Suzuki?

While unlikely, a weak battery or poor electrical connections can sometimes cause transmission-related codes due to inconsistent voltage supply.