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P0755 is a diagnostic trouble code (DTC) for "Shift Solenoid B Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0755 code indicates that the transmission’s shift solenoid B has experienced a malfunction, and the computer has detected it.
The P0755 code indicates that there is a problem with the transmission’s shift solenoid B. Note that this only applies to automatic transmissions. Your transmission has multiple shift solenoids that are used to manage fluid transfer and flow from one circuit to another in order to shift gears. If the P0755 code is set, it means that the computer has detected that the actual gear ratio used is different from the gear ratio calculations based on input from engine speed, throttle position and other aspects. Note that some vehicles may require more than one erroneous operation for the code to be stored.
A number of potential causes are possible with the P0755 code. These may include:
If the P0755 code is stored in your car’s computer, you could experience a wide range of symptoms. These vary depending on the severity of the situation, as well as the make and model in question. They can include:
The first step in diagnosing the cause of the P0755 code is to check the level and condition of the transmission fluid. If the fluid is low, it must be topped off before taking any further steps. If the fluid is dirty or contaminated, it will need to be changed before taking any other steps. Note that if the fluid smells burned or contains shavings, the mechanic will need to check the rest of the fluid in the drain pan. Metal shavings indicate internal damage to the transmission, and possibly the need for a rebuild.
Next, the mechanic will connect the car to an OBD II scanner to read the code and any other stored information. The codes will then be cleared and the vehicle test driven to see if the code resets. If it does, the mechanic will then check the shift solenoid, its wiring harness, connections and the shift solenoid circuit itself.
The most common mistake here is replacing the shift solenoid, when the problem actually lies with the shift solenoid circuit. This leads to incorrect repairs and increased frustration for the owner. Other mistakes include not checking the transmission fluid level and condition prior to replacing the shift solenoid.
The P0755 code is very serious. While it might not result in immediate driving problems, it is a sign that there is something wrong with your transmission. It is essential to have it diagnosed and repaired before further damage is done.
The most common repair for the P0755 code is replacement of the shift solenoid circuit. However, other repairs may include:
It is important that mechanics take all appropriate diagnostic steps when dealing with a P0755 code. Assuming that the code indicates the shift solenoid itself is at fault is the wrong way to proceed. There are many potential causes, and they must all be ruled out.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.