AutoCodes – Generic – P0797

P0797 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 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 26,248

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

What does this mean?

What are the Possible Causes of the DTC P0797?

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?

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 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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Information for Specific Makes

P0797 Acura — Pressure Control Solenoid 'C' Stuck On
P0797 Audi — Pressure Control Solenoid 'C' Stuck On
P0797 Buick — Pressure Control Solenoid Valve 3 Stuck On
P0797 Cadillac — Pressure Control Solenoid Valve 3 Stuck On
P0797 Chevrolet — Pressure Control Solenoid Valve 3 Stuck On
P0797 GMC — Pressure Control Solenoid Valve 3 Stuck On
P0797 Honda — Pressure Control Solenoid 'C' Stuck On
P0797 Infiniti — Pressure Control Solenoid 'C' Stuck On
P0797 Nissan — Pressure Control Solenoid 'C' Stuck On
P0797 Suzuki — Pressure Control Solenoid 'C' Stuck On
P0797 Volkswagen — Pressure Control Solenoid 'C' Stuck On

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.