AutoCodes – GMC – P0797 GMC

P0797 GMC Code - Pressure Control Solenoid Valve 3 Stuck On

Quick Answer

The clutch pressure control solenoid 3 is part of the control solenoid valve assembly, which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly. 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 GMC indicates Pressure Control Solenoid Valve 3 Stuck On.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly.
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 4,228

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 Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0797 GMC Description

The clutch pressure control solenoid 3 is part of the control solenoid valve assembly, which has no serviceable parts. The Clutch Pressure Control Solenoid 3 regulates transmission fluid pressure to the CBR1/C 4-5-6 clutch regulator valve which controls pressure to the low/reverse clutch and the 4-5-6 clutch. The Transmission Control Module calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The Transmission Control Module compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear. The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module has detected an incorrect gear ratio change when the low and reverse clutch and the 4-5-6 clutch is commanded OFF during a shift or when 4th gear ratio is detected in 1st gear. This condition must occur 3 times.

OBDII Code P0797 GMC - Pressure Control Solenoid Valve 3 Stuck On - AutoCodes.com — P0797 GMC Code - Pressure Control Solenoid Valve 3 Stuck On

What does this mean?

What are the Possible Causes of the DTC P0797 GMC?

Low transmission fluid level
Dirty transmission fluid
Faulty Control Solenoid Valve Assembly
Control Solenoid Valve Assembly harness or connectors
Control Solenoid Valve Assembly circuit is open or shorted

How to Fix the DTC P0797 GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0797 GMC 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.

Need more information about the P0797 GMC code?

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Information for Specific GMC Models

P0797 2014 GMC Sierra — Pressure Control Solenoid Valve 3 Stuck On
P0797 2015 GMC Sierra — Pressure Control Solenoid Valve 3 Stuck On
P0797 2016 GMC Sierra — Pressure Control Solenoid Valve 3 Stuck On
P0797 2017 GMC Sierra — Pressure Control Solenoid Valve 3 Stuck On
P0797 2018 GMC Sierra — Pressure Control Solenoid Valve 3 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 GMC Code

What are the common symptoms of OBDII code P0797 GMC?

- Common symptoms of OBDII code P0797 GMC, "Pressure Control Solenoid Valve 3 Stuck On," may include harsh shifting, transmission slipping, poor fuel economy, and the Check Engine light being illuminated.

What are the possible causes of OBDII code P0797 GMC?

- Possible causes of OBDII code P0797 GMC include a faulty pressure control solenoid valve, low transmission fluid level, dirty transmission fluid, electrical issues, or a problem with the transmission control module.

How serious is OBDII code P0797 GMC?

- OBDII code P0797 GMC can lead to drivability issues and potential damage to the transmission if left unresolved. It is recommended to address this code promptly to prevent further damage.

How can I diagnose OBDII code P0797 GMC?

- Diagnosing OBDII code P0797 GMC typically involves using a scan tool to retrieve the code, checking the transmission fluid level and condition, inspecting the pressure control solenoid valve, and performing electrical tests to pinpoint the issue.

Can I still drive my vehicle with OBDII code P0797 GMC?

- It is not recommended to drive your vehicle extensively with OBDII code P0797 GMC, as it can cause further damage to the transmission. It is best to have the issue diagnosed and repaired as soon as possible.

How can OBDII code P0797 GMC be repaired?

- Repairing OBDII code P0797 GMC may involve replacing the pressure control solenoid valve, performing a transmission fluid flush and filter replacement, addressing any electrical issues, or reprogramming the transmission control module.

Is OBDII code P0797 GMC a common problem in GMC vehicles?

- OBDII code P0797 GMC, related to the Pressure Control Solenoid Valve 3 being stuck on, can be a common issue in GMC vehicles with automatic transmissions, especially in models that have higher mileage or have not been well-maintained.

Can low transmission fluid cause OBDII code P0797 GMC?

- Yes, low transmission fluid can cause OBDII code P0797 GMC to trigger, as the pressure control solenoid valve relies on proper fluid levels to function correctly. It is essential to regularly check and maintain proper transmission fluid levels.

Should I attempt to repair OBDII code P0797 GMC myself?

- While some DIY enthusiasts may be able to address simple causes of OBDII code P0797 GMC, such as checking the transmission fluid level, it is recommended to have a professional diagnose and repair this code to prevent further transmission damage.