The proper performance of an automatic transmission is highly dependent on the shifts performed by the clutches and belts. Efficient shifting requires accurate transmission of fluid pressure, and to achieve this, pressure control solenoids are used to send fluid pressure to the clutches and belts.
The internal pressure of the pressure control solenoids is monitored as well as the operation of the solenoids to ensure that they are functioning correctly. If excessively high voltages are detected in the Pressure Control Solenoid A circuit after one of these tests, the fault code P0963 OBDII will be stored.