Obviously I mistyped the part number. Yes it is a P channel.

From the datasheet the Vth seems to be 4Volts min. Have you tested yet this MosFet?

Please check with an Osciloscope that the MosFet is fully closed at PIC low state, so that there is no voltage drop on S-D pins.

Was there a specific reason that you selected a P channel instead of a N channel control of the PWM signal? Usually the N channel have better characteristics in terms of Rds.

Ioannis