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No, no no. Absolutely not. You've understood this backwards, upside down and on fire, and did so on every. single. point.
Cranking in park and neutral but not other gears is NORMAL OPERATION.
If it starts in all gears you likely have a short to ground on the ECM's switch sensing circuit, and that'll trigger other fault codes (like a circuit low fault) and a fail-safe operation.
If it doesn't start in any gear it could be any piece of wire or component in any circuit related to starting the car.
The ECU never said the switch was faulty! it said "There's a transmission problem!" (P0700)
and "I see ground on my switch sensing circuit when there shouldn't be! (P0851). The detection logic is explained at the top of the diagnostic chart.
The only sure fire quick test that rules out everything but the switch or linkage is cranking in neutral but not in park.
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