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Engine-Codes – Generic – P0799

P0799 Code - Pressure Control Solenoid 'C' Intermittent

Quick Answer

The P0799 diagnostic trouble code indicates that there is an intermittent issue with the Pressure Control Solenoid 'C' in the transmission. Common causes include Faulty pressure control solenoid 'C', Wiring or connector issues in the solenoid circuit, Low transmission fluid level or dirty fluid. 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
P0799 indicates Pressure Control Solenoid 'C' Intermittent.
Common causes
Common causes include Faulty pressure control solenoid 'C', Wiring or connector issues in the solenoid circuit, Low transmission fluid level or dirty fluid.
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 15, 2024
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Code P0799 Description

The P0799 diagnostic trouble code indicates that there is an intermittent issue with the Pressure Control Solenoid 'C' in the transmission. The pressure control solenoid is responsible for regulating the hydraulic pressure in the transmission, which is crucial for shifting gears smoothly. When this solenoid malfunctions intermittently, it can lead to erratic shifting behavior, harsh shifts, delayed engagement, or even transmission slipping.

OBDII Code P0799 - Pressure Control Solenoid 'C' Intermittent
P0799 Code - Pressure Control Solenoid 'C' Intermittent

Common Causes of P0799

  1. Faulty pressure control solenoid 'C'
  2. Wiring or connector issues in the solenoid circuit
  3. Low transmission fluid level or dirty fluid
  4. Mechanical problems within the transmission
  5. Electrical issues in the transmission control module

Symptoms of P0799

  1. Erratic shifting behavior
  2. Harsh or delayed shifts
  3. Transmission slipping
  4. Illumination of the Check Engine Light
  5. Decreased fuel efficiency

How to Fix P0799

  1. Diagnose the specific cause of the issue by performing a thorough inspection of the pressure control solenoid 'C', wiring, and transmission fluid.
  2. Replace the faulty pressure control solenoid 'C' if it is determined to be the root cause of the problem.
  3. Repair or replace any damaged wiring or connectors in the solenoid circuit.
  4. Perform a transmission fluid flush and filter replacement if necessary.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0799

The typical repair costs for addressing a Pressure Control Solenoid 'C' Intermittent issue can range from $200 to $500, including parts and labor. However, it's important to note that the actual cost can vary depending on factors such as the vehicle make and model, the location of the repair shop, and the extent of the repairs needed. Additionally, diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It's recommended to obtain quotes from local shops to get a more accurate estimate for this repair.

What does this mean?

Tech Notes for P0799

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 P0799 is triggered when the ECM detects an intermittent circuit in shift solenoid valves

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Code P0799 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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