Hydraulic pressure control method for transmission

A vehicle comprising:

• a transmission;
• a hydraulic circuit for the transmission, the hydraulic circuit having a pressure control solenoid valve;
• and
• a controller configured to:
• determine whether a current shift range is in a predetermined first range;
• set a dither frequency of the pressure control solenoid valve to a predetermined first frequency when the current shift range is determined to be in the predetermined first range;
• and
• set the dither frequency of the pressure control solenoid valve to a predetermined second frequency when the current shift range is determined to be in a shift range other than the predetermined first range.