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Engine-Codes – Generic – P0797

P0797 Code - Pressure Control Solenoid 'C' Stuck On

Quick Answer

The P0797 code indicates that the Pressure Control Solenoid 'C' is stuck on in the transmission. Common causes include Faulty Pressure Control Solenoid 'C', Wiring issues, Bad connection. 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 indicates Pressure Control Solenoid 'C' Stuck On.
Common causes
Common causes include Faulty Pressure Control Solenoid 'C', Wiring issues, Bad connection.
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 Description

The P0797 code indicates that the Pressure Control Solenoid 'C' is stuck on in the transmission. This solenoid is responsible for regulating the hydraulic pressure in the transmission, which is essential for proper shifting and overall performance. When this solenoid gets stuck in the on position, it can lead to various issues with the transmission, affecting the vehicle's drivability and potentially causing long-term damage if not addressed promptly.

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

Common Causes of P0797

  1. Faulty Pressure Control Solenoid 'C'
  2. Wiring issues
  3. Bad connection
  4. Clogged transmission fluid filter
  5. Low transmission fluid levels

Symptoms of P0797

  1. Erratic or harsh shifting
  2. Transmission slipping
  3. Transmission getting stuck in one gear
  4. Reduced fuel efficiency
  5. Decreased power and overall performance

How to Fix P0797

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to confirm the P0797 code.
  2. Inspect the Pressure Control Solenoid 'C' and related wiring for any visible damage or issues.
  3. Check the transmission fluid level and condition, ensuring it is at the correct level and not contaminated.
  4. Replace the Pressure Control Solenoid 'C' if it is found to be faulty, ensuring proper installation and connection.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved and the transmission is functioning properly.

Cost to Fix P0797

The typical repair costs for addressing a Pressure Control Solenoid 'C' stuck on issue can range from $150 to $400, including parts and labor. However, the actual cost can vary depending on the specific cause of the problem, the make and model of the vehicle, and the labor rates at the auto repair shop. It is advisable to consult with a professional mechanic to get an accurate estimate based on your vehicle's specific needs.

What does this mean?

Tech Notes for P0797

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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Code P0797 Information for Specific Makes

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 Code

1. What is OBDII code P0797?

OBDII code P0797 refers to the Pressure Control Solenoid 'C' Stuck On in the transmission control system.

2. What are the common symptoms of code P0797?

Common symptoms of code P0797 include harsh shifting, transmission slipping, decreased fuel efficiency, and the transmission staying in a single gear.

3. What are the possible causes of code P0797?

Possible causes of code P0797 include a faulty pressure control solenoid 'C', low transmission fluid level, dirty or contaminated transmission fluid, or a wiring issue in the transmission control system.

4. How can I diagnose code P0797?

Diagnosing code P0797 typically involves using a scan tool to read the code, checking the transmission fluid level and condition, inspecting the wiring and connectors in the transmission control system, and testing the pressure control solenoid 'C' for proper operation.

5. Can I continue driving with code P0797 present?

It is not recommended to continue driving with code P0797 present, as it can lead to further damage to the transmission and potentially cause unsafe driving conditions.

6. How can I repair code P0797?

Repairing code P0797 may involve replacing the pressure control solenoid 'C', performing a transmission fluid flush and filter change, repairing any damaged wiring or connectors, and clearing the code with a scan tool.

7. Will resetting the error code resolve P0797?

Resetting the error code may temporarily clear the warning light, but it will not fix the underlying issue causing code P0797. It is important to diagnose and repair the root cause of the problem.

8. How much does it cost to fix code P0797?

The cost to fix code P0797 can vary depending on the specific cause of the issue, the labor rates of the repair shop, and the cost of any replacement parts needed. It is recommended to obtain quotes from different mechanics or repair shops.

9. Can a DIY enthusiast repair code P0797?

While some DIY enthusiasts may have the skills and tools to repair code P0797, working on the transmission system can be complex and challenging. It is advisable to consult a professional mechanic for proper diagnosis and repair.

10. How can I prevent OBDII code P0797 from recurring?

To prevent OBDII code P0797 from recurring, it is important to regularly maintain your vehicle by checking and changing the transmission fluid as recommended, addressing any leaks promptly, and ensuring proper operation of the transmission control system.

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