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Engine-Codes – Generic – P0798

P0798 Code - Pressure Control Solenoid 'C' Electrical

Quick Answer

The P0798 diagnostic trouble code refers to an issue with the Pressure Control Solenoid 'C' in the transmission system of a vehicle. Common causes include Faulty pressure control solenoid 'C', Wiring or connector issues, Malfunctioning transmission control module (TCM). 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
P0798 indicates Pressure Control Solenoid 'C' Electrical.
Common causes
Common causes include Faulty pressure control solenoid 'C', Wiring or connector issues, Malfunctioning transmission control module (TCM).
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 10, 2024
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Code P0798 Description

The P0798 diagnostic trouble code refers to an issue with the Pressure Control Solenoid 'C' in the transmission system of a vehicle. The pressure control solenoid is responsible for regulating the hydraulic pressure within the transmission, which is crucial for proper gear shifting and overall transmission performance. When this solenoid malfunctions or experiences electrical issues, it can lead to a variety of problems that affect the vehicle's drivability.

OBDII Code P0798 - Pressure Control Solenoid 'C' Electrical
P0798 Code - Pressure Control Solenoid 'C' Electrical

Common Causes of P0798

  1. Faulty pressure control solenoid 'C'
  2. Wiring or connector issues
  3. Malfunctioning transmission control module (TCM)
  4. Low transmission fluid levels
  5. Electrical issues within the transmission system

Symptoms of P0798

  1. Erratic or harsh shifting
  2. Slipping gears
  3. Transmission getting stuck in a specific gear
  4. Decreased fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix P0798

  1. Diagnose the issue by using a scan tool to retrieve the trouble codes and perform a thorough inspection of the transmission system.
  2. Test the pressure control solenoid 'C' and its electrical connection for proper operation.
  3. Replace the faulty pressure control solenoid 'C' if necessary, ensuring proper installation and connection.
  4. Inspect and repair any damaged wiring or connectors related to the solenoid.
  5. Clear the trouble codes, reset the transmission adaptations, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0798

The typical repair costs for addressing a Pressure Control Solenoid 'C' Electrical issue can vary depending on the vehicle make and model, the extent of the problem, and labor rates in your area. On average, the parts for a pressure control solenoid replacement can range from $100 to $300, while labor costs can vary from $200 to $500. Overall, the total repair costs for this issue could amount to $300 to $800. It's advisable to consult with a professional mechanic or auto repair shop to get an accurate estimate based on your specific vehicle and location.

What does this mean?

Tech Notes for P0798

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?

Engine Control Module (ECM) detectes an open or shorted condition on the solenoid circuit

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Code P0798 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.

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