AutoCodes – GMC – P0777 2016 GMC Sierra

P0777 2016 GMC Sierra Code - Clutch Pressure Control Solenoid 2 Stuck On

Quick Answer

The clutch pressure control solenoid valve 2 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: P0777 2016 GMC Sierra indicates Clutch Pressure Control Solenoid 2 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 257

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0777 2016 GMC Sierra Description

The clutch pressure control solenoid valve 2 is part of the control solenoid valve assembly, which has no serviceable parts. The pressure control solenoid valve 2 regulates transmission fluid pressure to the 3-5-Reverse clutch regulator valve which controls pressure to the 3-5-Reverse clutch. The Transmission Control Module calculates the 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 3-5-R clutch is commanded OFF during a shift or when 3rd gear ratio is detected in 1st gear. This condition must occur 3 times.

OBDII Code P0777 2016 GMC Sierra - Clutch Pressure Control Solenoid 2 Stuck On - AutoCodes.com — P0777 2016 GMC Sierra Code - Clutch Pressure Control Solenoid 2 Stuck On

What does this mean?

What are the Possible Causes of the DTC P0777 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 P0777 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 does this mean?

Code Tech Notes

When a transmission solenoid has 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, remove 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 P0777 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.

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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 P0777 2016 GMC Sierra Code

1. What does OBDII code P0777 on a 2016 GMC Sierra mean?

The P0777 code indicates a problem with the Clutch Pressure Control Solenoid 2 being stuck on in the transmission.

2. What are the common symptoms of a Clutch Pressure Control Solenoid 2 stuck on issue?

Common symptoms include harsh shifting, transmission slippage, decreased fuel efficiency, and the transmission staying in one gear.

3. What are the possible causes of the Clutch Pressure Control Solenoid 2 being stuck on?

Possible causes include a faulty solenoid, wiring issues, low transmission fluid, a blocked transmission filter, or internal transmission problems.

4. How serious is the P0777 OBDII code on a 2016 GMC Sierra?

Ignoring the P0777 code can lead to further damage to the transmission and potentially result in costly repairs if not addressed promptly.

5. Can I still drive my 2016 GMC Sierra with the P0777 code present?

It is not recommended to drive your vehicle with the P0777 code as it can cause further damage to the transmission and compromise driving safety.

6. How can I diagnose and repair the Clutch Pressure Control Solenoid 2 issue?

Diagnosis typically involves checking the solenoid, inspecting the wiring, testing transmission fluid levels, and examining the transmission filter. Repair may involve replacing the solenoid, fixing wiring issues, or addressing low fluid levels.

7. Is it possible to reset the P0777 code on a 2016 GMC Sierra without fixing the issue?

Resetting the code without addressing the underlying problem will only temporarily clear the error code and will not solve the root cause of the Clutch Pressure Control Solenoid 2 malfunction.

8. How much does it cost to fix the Clutch Pressure Control Solenoid 2 issue on a 2016 GMC Sierra?

The cost of repairs can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can a DIY enthusiast fix the Clutch Pressure Control Solenoid 2 problem?

While some DIY enthusiasts may have the skills to diagnose and replace the solenoid, it is generally recommended to have a professional mechanic handle transmission-related issues due to their complexity.

10. How can I prevent the Clutch Pressure Control Solenoid 2 from getting stuck on in the future?

Regular maintenance, such as changing transmission fluid and filters according to the manufacturer's recommendations, can help prevent issues like the Clutch Pressure Control Solenoid 2 malfunction.