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

Quick Answer

The P0797 diagnostic trouble code (DTC) for Audi vehicles indicates that the Pressure Control Solenoid 'C' is stuck on. Common causes include Faulty pressure control solenoid 'C', Electrical issues such as a short circuit or open circuit in the solenoid circuit, Mechanical blockage or restriction in the solenoid. 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 Faulty pressure control solenoid 'C', Electrical issues such as a short circuit or open circuit in the solenoid circuit, Mechanical blockage or restriction in the solenoid.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0797 Audi Description

The P0797 diagnostic trouble code (DTC) for Audi vehicles indicates that the Pressure Control Solenoid 'C' is stuck on. This solenoid is a crucial component of the transmission system, responsible for regulating hydraulic pressure within the transmission. When this solenoid becomes stuck in the "on" position, it can lead to various issues with the transmission's operation.

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

Common Causes of P0797 Audi

  1. Faulty pressure control solenoid 'C'
  2. Electrical issues such as a short circuit or open circuit in the solenoid circuit
  3. Mechanical blockage or restriction in the solenoid
  4. Malfunctioning transmission control module
  5. Low transmission fluid levels or contaminated fluid

Symptoms of P0797 Audi

  1. Erratic shifting behavior
  2. Harsh or delayed gear changes
  3. Slipping gears
  4. Transmission overheating
  5. Transmission going into failsafe mode

How to Fix P0797 Audi

  1. Begin by conducting a thorough diagnostic scan to confirm the presence of the P0797 code and identify any other related issues.
  2. Inspect the pressure control solenoid 'C' and its wiring harness for any signs of damage or wear. Replace the solenoid if necessary.
  3. Check the transmission fluid level and condition. Top up or replace the fluid as needed.
  4. Test the transmission control module for proper function and replace if faulty.
  5. Clear the fault codes, reset the transmission adaptation values, and road test the vehicle to ensure that the issue has been resolved.

Cost to Fix P0797 Audi

The typical repair costs for addressing a Pressure Control Solenoid 'C' stuck on issue can vary depending on the extent of the problem and the specific components that require replacement. In general, the cost of replacing the pressure control solenoid itself can range from $150 to $300, while the labor costs for the repair may be around $100 to $200. Additional costs for diagnostic time, transmission fluid, and any other necessary parts should also be considered. It's important to consult with a qualified mechanic or repair shop to get an accurate cost estimate based on the specific circumstances of your Audi vehicle. Labor rates at auto repair shops can vary, so it's advisable to inquire about rates in your local area for a more precise estimate.

What does this mean?

Tech Notes for P0797 Audi

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.

When is the Code Detected?

The gear required by the ECM does not match the actual gear when driving

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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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