P0730 code on 97 grand prix

[beattie]

Cars runs an drives fines shifts fine the other day i drove an hr away and back do around 80mph.. And when i got back in town every gear was goin hard was told to scan and this is the cold i got for gear ratio.. My car sat for an hour and has shifted fine since that was the only tine it was hard.. Wat would i need to change and i have a pcm from zzp to

[ExLimey]

I hope this helps. It'll give you a place to start.

P0730 Incorrect Gear Ratio OBDII Engine Light Trouble Code | Engine-Codes.com