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P0777 Chevrolet 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 Chevrolet 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 32,766
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 25, 2024
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Code P0777 Chevrolet 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 Chevrolet - Clutch Pressure Control Solenoid 2 Stuck On - AutoCodes.com
P0777 Chevrolet Code - Clutch Pressure Control Solenoid 2 Stuck On
What does this mean?

What are the Possible Causes of the DTC P0777 Chevrolet?

  • 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 Chevrolet?

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.

There is a factory service bulletin for the following Chevrolet Models:
2008-2009 Chevrolet Equinox
2008-2009 Chevrolet Malibu
2009 Chevrolet Traverse
Chevrolet Factory Service Bulletin OBDII Code P0777

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0777 Chevrolet 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 P0777 Chevrolet code?

Need more information on how to fix the P0777 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0777 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

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 Chevrolet Code

What does the OBDII code P0777 mean for a Chevrolet?

P0777 indicates that the transmission control module (TCM) has detected the Clutch Pressure Control Solenoid 2 is stuck in the "On" position, causing improper fluid pressure regulation in the transmission.

What are the symptoms of code P0777 in a Chevrolet?

Symptoms may include harsh or delayed shifting, transmission slipping, reduced fuel efficiency, the transmission stuck in a single gear (limp mode), and the Check Engine Light being illuminated.

What causes the P0777 code to appear in a Chevrolet?

Common causes include a faulty clutch pressure control solenoid, clogged or dirty transmission fluid, internal transmission damage, wiring or connector issues, or a malfunctioning transmission control module (TCM).

Can dirty or low transmission fluid cause the P0777 code?

Yes, dirty, degraded, or low transmission fluid can restrict fluid flow or pressure, potentially causing the solenoid to stick and triggering the P0777 code.

How can I fix the P0777 code on my Chevrolet?

Repairs may include replacing the defective solenoid, cleaning or replacing the transmission fluid, repairing or replacing damaged wiring or connectors, or addressing internal transmission problems.

Is it safe to drive with the P0777 code on a Chevrolet?

Driving with this code is not recommended, as it can lead to further transmission damage, reduced performance, and unsafe driving conditions if the transmission fails.

How do you diagnose the P0777 code in a Chevrolet?

Diagnosis typically involves checking the transmission fluid condition, inspecting the solenoid and related wiring, scanning for additional codes, and conducting pressure tests on the transmission system.

How much does it cost to fix the P0777 code on a Chevrolet?

Repair costs can vary widely depending on the cause, ranging from $150-$400 for a solenoid replacement to $1,000 or more if internal transmission repairs are required.

Can a faulty TCM cause the P0777 code in a Chevrolet?

Yes, a malfunctioning transmission control module (TCM) can send incorrect signals to the solenoid, causing it to stick and triggering the P0777 code.

How often should I check my transmission fluid to avoid the P0777 code?

It’s recommended to check transmission fluid levels and condition during routine maintenance, typically every 30,000-60,000 miles or as specified in your vehicle's owner’s manual.

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