AutoCodes – Audi – P0749 Audi

P0749 Audi Code - Pressure Control Solenoid 'A' Intermittent

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 Low transmission fluid level, Dirty transmission fluid, 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: P0749 Audi indicates Pressure Control Solenoid 'A' Intermittent.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, 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 3,146

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 P0749 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 P0749 Audi - Pressure Control Solenoid 'A' Intermittent - AutoCodes.com — P0749 Audi Code - Pressure Control Solenoid 'A' Intermittent

What does this mean?

What are the Possible Causes of the DTC P0749 Audi?

Low transmission fluid level
Dirty transmission fluid
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 P0749 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 P0749 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 P0749 Audi Code

1. What does the OBDII code P0749 mean on an Audi?

Code P0749 indicates an intermittent issue with the Pressure Control Solenoid 'A,' which regulates hydraulic pressure in the transmission to ensure smooth gear shifts.

2. What are the common symptoms of P0749 in an Audi?

Symptoms may include harsh or delayed shifting, slipping gears, reduced fuel efficiency, transmission overheating, or the vehicle entering limp mode.

3. What causes the P0749 code in an Audi?

Common causes include a faulty pressure control solenoid, damaged wiring or connectors, low or dirty transmission fluid, or internal transmission issues.

4. Can I drive my Audi with the P0749 code?

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

5. How do I diagnose code P0749 on an Audi?

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

6. How much does it cost to fix the P0749 code on an Audi?

Repairs can range from $100 to $500 for solenoid replacement, but costs may increase if internal transmission repairs are needed.

7. Can dirty transmission fluid cause the P0749 code?

Yes, contaminated or low transmission fluid can restrict solenoid operation, leading to intermittent issues and triggering the code.

8. How is the P0749 code fixed in an Audi?

Repairs may include replacing the pressure control solenoid, repairing damaged wiring or connectors, or performing a transmission fluid flush and refill.

9. What tools are needed to fix P0749 on an Audi?

You may need an OBDII scanner, multimeter, transmission fluid, and basic hand tools to diagnose and repair the issue.

10. How can I prevent the P0749 code from occurring on my Audi?

Regularly check and maintain your transmission fluid, inspect wiring for wear, and follow the manufacturer's recommended service intervals for transmission maintenance.