AutoCodes – Audi – P0746 Audi

P0746 Audi Code - Pressure Control Solenoid 'A' Performance Or Stuck Off

Quick Answer

The Pressure Control (PC) Solenoid Valve is 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. 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: P0746 Audi indicates Pressure Control Solenoid 'A' Performance Or Stuck Off.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty line pressure solenoid valve.
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 9,579

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 Jul 30, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0746 Audi Description

The Pressure Control (PC) Solenoid Valve is 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). The Diagnostic Trouble Code (DTC) will be set when the gear required by the Engine Control Module (ECM) does not match the actual gear when driving.

OBDII Code P0746 Audi - Pressure Control Solenoid 'A' Performance Or Stuck Off - AutoCodes.com — P0746 Audi Code - Pressure Control Solenoid 'A' Performance Or Stuck Off

What does this mean?

What are the Possible Causes of the DTC P0746 Audi?

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

How to Fix the DTC P0746 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 P0746 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 P0746 Audi Code

What does the OBDII code P0746 mean for an Audi?

P0746 indicates an issue with the Pressure Control Solenoid 'A,' which may be malfunctioning, stuck off, or not performing as expected, causing transmission performance problems.

What are the common symptoms of code P0746 in an Audi?

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

What causes the P0746 code to trigger in an Audi?

Common causes include a faulty pressure control solenoid, low or dirty transmission fluid, a clogged transmission filter, wiring issues, or internal transmission problems.

Can I drive my Audi with the P0746 code?

Driving with this code is not recommended, as it can lead to further transmission damage or safety issues if shifting problems worsen.

How do I diagnose the P0746 code in my Audi?

Diagnosis typically involves checking the transmission fluid level and quality, inspecting wiring and connectors, testing the solenoid with a multimeter, and possibly performing a transmission pressure test.

What repairs are commonly needed for the P0746 code in an Audi?

Repairs may include replacing the pressure control solenoid, cleaning or replacing the transmission filter, repairing damaged wiring, or performing a transmission fluid flush.

How much does it cost to repair the P0746 code on an Audi?

Repair costs can vary widely, ranging from $150 to $450 for solenoid replacement or more if internal transmission damage is found.

Can low transmission fluid cause the P0746 code in an Audi?

Yes, low or dirty transmission fluid can cause insufficient pressure, leading to solenoid malfunction and triggering the P0746 code.

How can I prevent the P0746 code from occurring in my Audi?

Regularly maintaining your transmission by changing the fluid and filter as recommended and addressing any transmission issues promptly can help prevent this code.

Will resetting the check engine light fix the P0746 code in an Audi?

Resetting the light without addressing the underlying issue will not fix the problem, and the code is likely to return.