AutoCodes – GMC – P0797 2016 GMC Sierra

P0797 2016 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 2016 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 214

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 2016 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 2016 GMC Sierra - Pressure Control Solenoid Valve 3 Stuck On - AutoCodes.com — P0797 2016 GMC Sierra Code - Pressure Control Solenoid Valve 3 Stuck On

What does this mean?

What are the Possible Causes of the DTC P0797 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What does the OBDII code P0797 mean on a 2016 GMC Sierra?

P0797 indicates that the Pressure Control Solenoid Valve 3 in the transmission is stuck in the "on" position, affecting the vehicle's ability to shift gears properly.

2. What are the common symptoms of a P0797 code on a 2016 GMC Sierra?

Symptoms may include harsh or erratic shifting, slipping gears, decreased fuel efficiency, transmission overheating, and the check engine light being illuminated.

3. What causes the P0797 code to appear on a 2016 GMC Sierra?

Common causes include a faulty pressure control solenoid, low or dirty transmission fluid, a clogged transmission filter, internal transmission damage, or wiring and connection issues.

4. Can low transmission fluid cause the P0797 code on a 2016 GMC Sierra?

Yes, low or contaminated transmission fluid can cause the solenoid to malfunction, potentially triggering the P0797 code.

5. How do you diagnose a P0797 code on a 2016 GMC Sierra?

Diagnosis involves checking the transmission fluid level and condition, inspecting the wiring and connectors to the solenoid, testing the solenoidâ€™s electrical resistance, and possibly performing a pressure test on the transmission.

6. Can you drive a 2016 GMC Sierra with a P0797 code?

Itâ€™s not recommended, as driving with this code can cause further damage to the transmission and lead to unsafe driving conditions due to shifting issues.

7. How is a P0797 code fixed on a 2016 GMC Sierra?

Repairs may include replacing the faulty pressure control solenoid, flushing and refilling the transmission fluid, replacing the transmission filter, fixing damaged wiring, or repairing internal transmission components.

8. How much does it cost to repair a P0797 code on a 2016 GMC Sierra?

Costs vary depending on the issue, ranging from $150 to $400 for solenoid replacement or fluid service, and up to several thousand dollars if internal transmission repairs are required.

9. Can a dirty transmission filter cause the P0797 code on a 2016 GMC Sierra?

Yes, a clogged or dirty transmission filter can restrict fluid flow, causing the solenoid to stick and triggering the P0797 code.

10. How can I prevent the P0797 code from occurring on my 2016 GMC Sierra?

Regular transmission maintenance, including fluid and filter changes at recommended intervals, can help prevent solenoid issues and reduce the likelihood of this code appearing.