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P0777 Buick Code - Clutch Pressure Control Solenoid 2 Stuck On

Quick Answer

The P0777 Buick code indicates that the Clutch Pressure Control Solenoid 2 is stuck on. Common causes include Failed clutch pressure control solenoid 2, Electrical issues such as a short circuit or damaged wiring, Faulty transmission control module. 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 Buick indicates Clutch Pressure Control Solenoid 2 Stuck On.
Common causes
Common causes include Failed clutch pressure control solenoid 2, Electrical issues such as a short circuit or damaged wiring, Faulty transmission control module.
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 11, 2024
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Code P0777 Buick Description

The P0777 Buick code indicates that the Clutch Pressure Control Solenoid 2 is stuck on. This solenoid is responsible for regulating the hydraulic pressure in the transmission's clutch system. When it becomes stuck in the on position, it can lead to various issues with the transmission's operation.

OBDII Code P0777 Buick - Clutch Pressure Control Solenoid 2 Stuck On
P0777 Buick Code - Clutch Pressure Control Solenoid 2 Stuck On

Common Causes of P0777 Buick

  1. Failed clutch pressure control solenoid 2
  2. Electrical issues such as a short circuit or damaged wiring
  3. Faulty transmission control module
  4. Low transmission fluid level or dirty fluid
  5. Mechanical issues within the transmission itself

Symptoms of P0777 Buick

  1. Harsh or delayed shifting
  2. Transmission slipping
  3. Erratic shifting behavior
  4. Illumination of the check engine light
  5. Reduced fuel efficiency

How to Fix P0777 Buick

  1. Diagnose the issue using a scan tool to verify the P0777 code and identify the specific cause.
  2. Inspect the clutch pressure control solenoid 2 for any signs of damage or malfunction.
  3. Check the transmission control module and wiring for any faults or shorts.
  4. Replace the faulty clutch pressure control solenoid 2 if necessary.
  5. Clear the trouble codes, perform a test drive to ensure proper operation, and reset the vehicle's computer if needed.

Cost to Fix P0777 Buick

The typical repair costs for addressing a P0777 code can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

What does this mean?

Tech Notes for P0777 Buick

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 Buick Models:

2008-2009 Buick Enclave

2008-2009 Buick Enclave Factory Service Bulletin OBDII Code P0777

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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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