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Engine-Codes – GMC – P0777 2018 GMC Sierra

P0777 2018 GMC Sierra Code - Clutch Pressure Control Solenoid 2 Stuck On

Quick Answer

The P0777 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Clutch Pressure Control Solenoid 2 being stuck on. Common causes include Mechanical failure of the Clutch Pressure Control Solenoid 2, Electrical fault in the solenoid circuit, Low transmission fluid levels. 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 2018 GMC Sierra indicates Clutch Pressure Control Solenoid 2 Stuck On.
Common causes
Common causes include Mechanical failure of the Clutch Pressure Control Solenoid 2, Electrical fault in the solenoid circuit, Low transmission fluid levels.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code P0777 2018 GMC Sierra Description

The P0777 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Clutch Pressure Control Solenoid 2 being stuck on. This solenoid is a crucial component of the transmission system, responsible for regulating the hydraulic pressure that controls the engagement and disengagement of the clutch. When this solenoid gets stuck in the "on" position, it can lead to various performance issues within the transmission system.

OBDII Code P0777 2018 GMC Sierra - Clutch Pressure Control Solenoid 2 Stuck On
P0777 2018 GMC Sierra Code - Clutch Pressure Control Solenoid 2 Stuck On

Common Causes of P0777 2018 GMC Sierra

  1. Mechanical failure of the Clutch Pressure Control Solenoid 2
  2. Electrical fault in the solenoid circuit
  3. Low transmission fluid levels
  4. Contaminated transmission fluid
  5. Issues with the transmission control module

Symptoms of P0777 2018 GMC Sierra

  1. Erratic shifting patterns
  2. Harsh or delayed gear changes
  3. Transmission slipping
  4. Vehicle going into failsafe mode
  5. Check Engine Light illuminated

How to Fix P0777 2018 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a scan tool to read the DTC and perform additional tests if necessary.
  2. Inspect the Clutch Pressure Control Solenoid 2 for any signs of damage or blockages. Replace the solenoid if it is found to be faulty.
  3. Check the transmission fluid level and condition. Top up or replace the fluid if needed.
  4. Inspect the transmission control module for any faults or errors. Reset or reprogram the module as required.
  5. Clear the DTC from the vehicle's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0777 2018 GMC Sierra

The typical repair costs for addressing a P0777 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing the Clutch Pressure Control Solenoid 2 and performing related repairs can range from $200 to $500, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary significantly. Rates typically range between $80 and $150 per hour, with higher rates in metropolitan areas or at dealerships and lower rates at independent shops. For a more precise estimate, it's recommended to check with local auto repair shops.

What does this mean?

Tech Notes for P0777 2018 GMC Sierra

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.

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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.

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