Pressure control solenoids are components used for monitoring the transmission fluid pressure. Through such action, it is possible to check the proper work of the automatic transmission. It should be noted that the correct operation of the transmission depends on the proper pressure since it is controlled by belts and clutches that constantly change gears. These solenoids are used to send the fluid at the correct pressure to the various circuits that are in charge of transmission shifting.
When the P0965 OBDII fault code is stored, it is because performance problems were found on the part of the pressure control solenoid B circuit.