AutoCodes – Audi – P0779 Audi

P0779 Audi Code - Pressure Control Solenoid 'B' 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 'B' 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: P0779 Audi indicates Pressure Control Solenoid 'B' Intermittent.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty line pressure solenoid 'B' 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 3,158

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 30, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0779 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 P0779 Audi - Pressure Control Solenoid 'B' Intermittent - AutoCodes.com — P0779 Audi Code - Pressure Control Solenoid 'B' Intermittent

What does this mean?

What are the Possible Causes of the DTC P0779 Audi?

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

How to Fix the DTC P0779 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 P0779 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 P0779 Audi Code

1. What does the OBDII code P0779 mean on an Audi?

P0779 indicates an intermittent issue with the Pressure Control Solenoid 'B', which helps regulate fluid pressure for proper transmission operation.

2. What are the common symptoms of the P0779 code in an Audi?

Symptoms may include harsh or delayed shifting, transmission slipping, decreased fuel efficiency, or the Check Engine Light turning on.

3. What causes the P0779 code to appear in an Audi?

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

4. Can driving with the P0779 code damage my Audi?

Yes, driving with this code can lead to further transmission damage if left unresolved, especially if shifting issues persist.

5. How do I diagnose the P0779 code in my Audi?

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

6. What repairs are needed to fix the P0779 code on an Audi?

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

7. How much does it cost to fix the P0779 code in an Audi?

Repair costs can range from $150 to $500 or more, depending on whether the solenoid needs replacement or if more extensive transmission repairs are required.

8. Can I clear the P0779 code without fixing the issue?

Clearing the code without addressing the underlying problem will likely result in the code returning and could exacerbate transmission issues.

9. Is low transmission fluid a common cause of the P0779 code?

Yes, low or contaminated transmission fluid can lead to improper solenoid operation and trigger the P0779 code.

10. Can a transmission software update fix the P0779 code on an Audi?

In some cases, a software update may resolve the issue if it is related to transmission control module programming, but physical problems with the solenoid or fluid typically require repairs.