AutoCodes – GMC – P0797 2017 GMC Sierra

P0797 2017 GMC Sierra 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 2017 GMC Sierra 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 240

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 2017 GMC Sierra 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 2017 GMC Sierra - Pressure Control Solenoid Valve 3 Stuck On - AutoCodes.com — P0797 2017 GMC Sierra Code - Pressure Control Solenoid Valve 3 Stuck On

What does this mean?

What are the Possible Causes of the DTC P0797 2017 GMC Sierra?

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 2017 GMC Sierra?

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 2017 GMC Sierra 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 2017 GMC Sierra code?

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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 2017 GMC Sierra Code

What does the OBDII code P0797 mean on a 2017 GMC Sierra?

The P0797 code indicates that the Transmission Control Module (TCM) has detected that Pressure Control Solenoid Valve 3 is stuck in the "on" position, causing improper transmission operation.

What are the symptoms of a P0797 code in a 2017 GMC Sierra?

Symptoms may include harsh or delayed shifting, transmission slipping, poor fuel economy, a stuck gear, or the vehicle going into limp mode.

What causes the P0797 code to appear on a 2017 GMC Sierra?

Common causes include a faulty pressure control solenoid, low or dirty transmission fluid, a clogged transmission filter, wiring issues, or a malfunctioning TCM.

Can I drive my 2017 GMC Sierra with a P0797 code?

It is not recommended to drive with this code active, as continued operation could lead to severe transmission damage or unsafe driving conditions.

How can I diagnose the P0797 code in my 2017 GMC Sierra?

Start by checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and testing the solenoid with a scan tool capable of transmission diagnostics.

How do I fix the P0797 code on a 2017 GMC Sierra?

Repairs may include replacing the pressure control solenoid, cleaning or replacing the transmission filter, repairing damaged wiring, or updating/reprogramming the TCM.

How much does it cost to repair a P0797 code on a 2017 GMC Sierra?

The repair cost can range from $200 to $500 for solenoid replacement, while more extensive repairs, like TCM reprogramming or additional parts, could increase the cost.

Can low transmission fluid cause a P0797 code in a 2017 GMC Sierra?

Yes, low or dirty transmission fluid can cause the solenoid to malfunction, leading to the P0797 code.

Is a transmission flush necessary to fix the P0797 code in a 2017 GMC Sierra?

A transmission flush may help if the problem is due to dirty or contaminated fluid, but it should only be done if recommended after diagnosing the issue.

Do I need to replace the transmission to fix the P0797 code on my 2017 GMC Sierra?

In most cases, replacing the transmission is unnecessary. The issue is often resolved by repairing or replacing the solenoid, fixing wiring problems, or addressing fluid issues.