Check Engine P0851

[Seven04]

Ok so my check engine light when on this morning while warming up the car right after I turned on the windshield defroster, on a 2004 Wrx, I heard it could be something with cruise control, but im not sure.

Malfunction Code:

P0851
Park/Neutral
Switch Input
Circuit low

Fixed the problem, went trough all the gears and played around with the park sensor and the check engine went out