Code P1780 was a pre-2003 diagnostic code. It wasn't just an indicator of P/N position switch malfunction. It could also mean a gear position range malfunction or fault. In other words, it might mean there's no reliable indication of **any** gear position, not just Park and Neutral.
The P/N switch is involved in 'signalling' all the gear positions, but the wires involved for this general purpose are not the same set of wires used in the connections where the P/N switch affects the starter circuit.
Since you mentioned no problems with starting (right? ...), I'm guessing the problem has to do with the overall gear range indicator function.
If I were you, I would pay the $60-75 and have this looked at by the Toyota service department. This isn't a code to ignore or as others have (hopefully jokingly) mentioned to unplug the battery to temporarily reset the code and let me emphasize the word temporarily.
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what does a toyota obd code p1780 mean?
Linear Mode
