Originally Posted by vetteoz
Is only a indicator to the ECM so it can adjust the RPM for being in or out of gear.
There is no feedback or error codes for it working or even being wired up.
With my aftermarket shifter, I have not had that indication to the ECM for 8 years
You need to read the service manual. Or re-check your data.
AS written in a 1989 Factory Service manual Page 6E3-C1-3
"The Park/Neutral (P/N) switch indicates to the ECM when the transmission is in park or neutral.This information is used for the TCC and the IAC valve operation.
Vehicle should not be driven with park/neutral switch disconnected, as idle quality will be affected and a possible false code 2
See section "8A" for more information on the P/N switch, which is part of neutral/start and backup light switch assembly".
In a Factory Service Manual for a 1993 Corvette. The IS a CODE 72 that deals with the gear selector switch.