AutoCodes – Audi – P0748 Audi

P0748 Audi 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 Audi 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 9,607

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

What does this mean?

What are the Possible Causes of the DTC P0748 Audi?

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 Audi?

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 Audi 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 Audi Code

1. What does the OBDII code P0748 mean on an Audi?

P0748 indicates an electrical issue with the Pressure Control Solenoid 'A,' which regulates hydraulic pressure in the transmission.

2. What are the symptoms of a P0748 code on an Audi?

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

3. What causes the P0748 code to appear on an Audi?

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

4. Can I drive my Audi with a P0748 code?

Driving with a P0748 code is not recommended as it can cause further damage to the transmission and affect vehicle performance.

5. How is the P0748 code diagnosed on an Audi?

Diagnosis involves scanning the vehicle for codes, inspecting the solenoid and wiring, checking transmission fluid levels, and testing the TCM if necessary.

6. How do I fix the P0748 code on an Audi?

Repairs may include replacing the faulty solenoid, repairing damaged wiring, refilling or flushing the transmission fluid, or reprogramming the TCM.

7. How much does it cost to repair a P0748 code on an Audi?

The cost varies depending on the issue but typically ranges from $150 to $400 for solenoid replacement and more for extensive transmission repairs.

8. Can low transmission fluid cause a P0748 code on an Audi?

Yes, low or dirty transmission fluid can affect solenoid operation and trigger the P0748 code.

9. Is the Pressure Control Solenoid 'A' hard to replace on an Audi?

Replacing the solenoid can be complex, as it often requires removing the transmission pan or valve body, and is best handled by a professional.

10. Will clearing the P0748 code solve the problem on my Audi?

Clearing the code without fixing the underlying issue will not resolve the problem, and the code is likely to return.

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