AutoCodes – GMC – P0797 2015 GMC Sierra

P0797 2015 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 2015 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 205

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 2015 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 2015 GMC Sierra - Pressure Control Solenoid Valve 3 Stuck On - AutoCodes.com — P0797 2015 GMC Sierra Code - Pressure Control Solenoid Valve 3 Stuck On

What does this mean?

What are the Possible Causes of the DTC P0797 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What does the OBDII code P0797 mean on a 2015 GMC Sierra?

P0797 indicates that the transmission control module (TCM) has detected that Pressure Control Solenoid Valve 3 is stuck in the "on" position, causing abnormal hydraulic pressure in the transmission.

2. What are the common symptoms of code P0797 in a 2015 GMC Sierra?

Symptoms may include harsh or delayed shifting, transmission slipping, reduced fuel efficiency, transmission overheating, or the vehicle going into limp mode.

3. What causes the P0797 code to appear in a 2015 GMC Sierra?

Common causes include a faulty pressure control solenoid, dirty or low transmission fluid, a clogged transmission filter, hydraulic blockages, or internal transmission damage.

4. Can low transmission fluid cause the P0797 code?

Yes, low or dirty transmission fluid can lead to improper solenoid operation, which may trigger the P0797 code.

5. How do you diagnose the P0797 code on a 2015 GMC Sierra?

Diagnosis involves scanning for additional codes, inspecting the transmission fluid, checking the wiring and connectors to the solenoid, and testing the solenoid's electrical resistance and functionality.

6. How serious is the P0797 code on a 2015 GMC Sierra?

This code is moderately serious as it affects transmission performance and may cause further damage if not addressed promptly.

7. Can you drive a 2015 GMC Sierra with the P0797 code?

Driving with this code is not recommended, as it can lead to further transmission damage or unsafe driving conditions due to erratic shifting.

8. How is the P0797 code fixed in a 2015 GMC Sierra?

Repairs may involve replacing the faulty solenoid, cleaning or replacing the transmission filter, flushing and refilling the transmission fluid, or repairing internal transmission damage.

9. How much does it cost to fix the P0797 code on a 2015 GMC Sierra?

Repair costs vary, ranging from $150 to $400 for solenoid replacement, plus any additional costs for fluid and filter replacement. Extensive transmission repairs can cost significantly more.

10. Can a transmission flush resolve the P0797 code in a 2015 GMC Sierra?

A transmission flush may resolve the issue if the code is caused by dirty or contaminated fluid, but further diagnosis is needed to confirm the root cause.