Have a 2003 550 Service Truck that when I just scanned it had code p1780. Transmission Control Switch (O/D cancel) Circuit out of Self Test Range. My Mechanic that drives the truck has complained that the truck has sporadic power loss. Would this code effect performance? What sets this code off? And what corrective messures can be taken. Not fimilar with the Fords as I have always had Cummins.

 

P1780 - Transmission Control Switch Out of Self-Test Range During KOER self-test the TCS has to be cycled, if not cycled a DTC is set. TCS circuit short or open
Damaged TCS switch
Damaged PCM
Verify the TCS switch cycles ON/OFF