AutoCodes – Audi – P0797 Audi

P0797 Audi Code - Pressure Control Solenoid 'C' Stuck On

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 pressure control solenoid valve 'C'. 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: P0797 Audi indicates Pressure Control Solenoid 'C' Stuck On.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty pressure control solenoid valve 'C'.
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 3,843

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 P0797 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 P0797 Audi - Pressure Control Solenoid 'C' Stuck On - AutoCodes.com — P0797 Audi Code - Pressure Control Solenoid 'C' Stuck On

What does this mean?

What are the Possible Causes of the DTC P0797 Audi?

Low transmission fluid level
Dirty transmission fluid
Faulty pressure control solenoid valve 'C'
Pressure control solenoid valve 'C' harness is open or shorted
Pressure control solenoid valve 'C' circuit poor electrical connection

How to Fix the DTC P0797 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 P0797 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 P0797 Audi Code

1. What does the OBDII code P0797 mean on an Audi?

P0797 indicates that the pressure control solenoid 'C' in the transmission is stuck in the "on" position, which can affect the transmission's ability to shift gears properly.

2. What are the common symptoms of the P0797 code in an Audi?

Symptoms include harsh or delayed shifting, transmission slipping, poor fuel efficiency, and the check engine light illuminating.

3. What causes the P0797 code to appear in an Audi?

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

4. Can driving with the P0797 code damage my Audi further?

Yes, driving with this code can lead to further transmission damage if not addressed promptly, as improper pressure control can cause excessive wear.

5. How do you diagnose the P0797 code on an Audi?

Diagnosis typically involves scanning for codes, inspecting the transmission fluid condition, checking the solenoid wiring and connectors, and testing the pressure control solenoid itself.

6. How do you fix the P0797 code on an Audi?

Repairs may include replacing the pressure control solenoid, flushing and refilling the transmission fluid, repairing damaged wiring, or addressing internal transmission problems.

7. Can low transmission fluid cause the P0797 code on an Audi?

Yes, low or dirty transmission fluid can lead to improper solenoid operation and trigger the P0797 code.

8. How much does it cost to repair the P0797 code on an Audi?

The cost can vary, but replacing the pressure control solenoid typically ranges from $200 to $500, while more extensive transmission repairs can cost significantly more.

9. Will clearing the P0797 code fix the issue in my Audi?

Clearing the code will reset the check engine light temporarily, but the underlying issue must be addressed to prevent the code from returning.

10. Can a bad transmission control module (TCM) cause the P0797 code in an Audi?

While less common, a faulty TCM can sometimes cause solenoid-related codes, including P0797, if it fails to properly control the solenoid.

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