Pressure Control Solenoid A (PCA)
WARNING: This page is about a different car, the 2012 Ford F550 Super Duty and 2012 Ford F450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The Pressure Control Solenoid A (PCA) is an inversely proportional 3-port device. The pressure output is inversely proportional to the applied direct current supplied from the PCM through an electronically controlled driver, which varies the current between 0 and 1 amp. The PCA solenoid controls the line pressure circuits.