Thanks much, but if you read my post all the way to the end, I have already ruled that out as my problem. It is not the Shift Interlock Module. It works perfectly every time I press the brake and unlocks the shifter lock inside the center console...I can see it happen! I truly believe I have a problem with the park pawl to notched park gear in the rear housing of the transmission! Thanks for the comment regardless! I will have to drop the drive shaft and then pull the rear housing cover off to see it. ...more to come!