P0775 Code: Pressure Control Solenoid “B” Malfunction

What Does the P0775 Code Mean?

Diagnostic trouble code (DTC) P0775 stands for “Pressure Control Solenoid ‘B’ Malfunction.” There are usually three pressure solenoid groups inside an automatic transmission that are designated A, B, and C. The P0775 code is triggered when the powertrain control module (PCM) detects pressure control solenoid “B” is experiencing a malfunction.

The pressure control solenoid is a spring-loaded plunger device that regulates hydraulic fluid pressure inside the transmission. Pressure control solenoids are responsible for controlling the flow of transmission fluid, which is important for an automatic transmission to work properly. A faulty pressure control solenoid can result in transmission issues.

A malfunctioning transmission solenoid can be caused by low or dirty transmission fluid, wiring issues, or simply old age.

Note: The definition of the P0775 code can be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0775 Code?

Several issues can cause the P0775 code to trigger. These include the following:

• Defective pressure control solenoid
• Dirty or contaminated transmission fluid
• Clogged transmission filter
• Defective transmission pump
• Defective transmission valve body
• Clogged transmission fluid passages
• Faulty wiring
• Faulty PCM

What are the Common Symptoms of the P0775 Code?

The most common signs of a P0775 code include the following:

• The vehicle enters limp mode
• Transmission slips when shifting
• Transmission overheating
• Transmission gets stuck in a gear
• Decreased fuel efficiency
• Engine has misfire-like symptoms
• Illuminated check engine light

How to Diagnose the P0775 Code

Diagnosing the P0775 code can be difficult. While the code’s definition points to the transmission as the problem, diagnosing the concerned components isn’t simple.  To be able to diagnose the issue, you might need to do a visual inspection of the concerned parts. This can be difficult if you don’t have the right knowledge or tools. If you want to properly diagnose the P0775 code, then we recommend that you consult a trusted mechanic.

If you’re interested in learning more about the diagnostic process, then the following video can give you a better idea:

How to Fix the P0775 Code

When it comes to OBD codes like the P0775, there isn’t an umbrella solution that can fix the issue. As vehicle designs vary, their respective diagnosis and repair procedures can also vary. 

If you have the appropriate knowledge and hands-on experience with repairs, then the first step is to properly identify the issue first. After identifying the cause of the P0775 code, then you can start consulting online repair resources and guides for possible fixes.