P0755 Code: Shift Solenoid “B” Malfunction

Several factors can cause your automatic transmission to slip, overheat, or become stuck. To determine the cause of your transmission problem, you’ll need to use an OBD-II scanner. One of the diagnostic trouble codes you may encounter is code P0755. In this article, we’ll take a look at the possible causes, symptoms, and fixes for code P0755.

What Does the P0755 Code Mean?

Code P0755 refers to a “Shift Solenoid “B” Malfunction.” Most vehicles with automatic transmissions have at least three transmission shift solenoids, namely A, B, and C, 1, 2, and 3, or 1-2, 2-3, and 3-4. Many modern transmissions have more than three solenoids.

Your OBD-II scanner may pick up code P0755 if your powertrain control module (PCM) detects a malfunctioning shift solenoid “B” if the transmission solenoids are alphabetically designated.

Shift solenoids enable your PCM to manage transmission fluid flow between hydraulic circuits and change gears as needed. Shift solenoids open and close valves in the valve body to allow transmission fluid to reach your clutches and bands for a smooth shift. A malfunctioning shift solenoid “B” can potentially interrupt this process and cause a variety of transmission problems, which can make your vehicle undrivable.

Read our technical discussion about shift solenoids to better understand codes like P0755, especially if you’re planning to diagnose or fix the issue yourself.

What are Possible Causes of P0755?

A failing shift solenoid B can trigger a variety of diagnostic trouble codes, depending on the type of vehicle and the number of gears included in its automatic transmission. Here are some possible causes for the P0755 code:

• PCM failure
• Shift solenoid failure
• Insufficient transmission fluid
• Contaminated transmission fluid
• Dirty or clogged transmission filter
• Faulty transmission valve body
• Blocked or restricted hydraulic passages
• Internal transmission failure
• Damaged or corroded connector
• Faulty or damaged wiring

What are the Common Symptoms of the P0755 Code?

Most of the symptoms associated with the P0755 code are related to the transmission. You should have your transmission checked if your vehicle exhibits any of the following symptoms.

• Transmission slipping
• Transmission overheating
• Transmission goes into limp mode
• Transmission won’t shift into or out of gear
• Reduced fuel efficiency
• Check engine light illuminates
• Misfire-like symptoms

How to Diagnose the P0755 Code

Don’t know how to use your OBD-II scanner? Watch this informative video to find out how to properly diagnose the P0755 code. 

How to Fix the P0755 Code

The troubleshooting process for a shift solenoid “B” malfunction may vary from vehicle to vehicle, depending on their year, make, model, and powertrain configuration. Code P0755 may affect Ford, Chrysler, Dodge, Hyundai, Kia, Ram, Lexus, Toyota, Mazda, Honda, and Volkswagen vehicles differently. What may work to resolve the P0755 code in a Ford may not work in a Ram. That’s why we recommend looking up technical service bulletins for your specific vehicle to save time.

You can start by researching common problems on credible OBD-II sites to get a better understanding of the P0755 code in your specific vehicle. After you’ve gathered enough information, you’ll need to accurately diagnose the code to find out the underlying causes for your shift solenoid “B” malfunction. Online auto repair resources and guides can help you determine the correct fix.

However, you can also ask a technician to diagnose the code for you. They can run precise diagnostic tests to determine the cause of your P0755 code and repair it in accordance with your vehicle’s specific repair instructions. This can help save you time and effort on maintenance if you don’t mind the extra cost.