GGattorr

So I did my first diagnostic code read for the first time by crossing a wire from "A" to "G". Now mind you this car sat for at least 4 years in a garage with not much attention. I am bringing her back to life 1 part at a time.
So I got codes C41,H41,H72,H74.......4 Err........7 Err.
I thought I was only supposed to get codes for 1nand 4 on a 91 coupe.
It has an after market radio and I guess that's what the H72 and H74 are(from what I have read on this site). C & H41 is Loss of ECM serial data communications. Ok what the heck does that mean??
And what do the "Err" mean on sections 4 and 7?
thanks every one for the help. this is my daily driver and I am trying to get her back into the awesome car she is!!!!!

Kevova

I think you need to get a set of factory service manuals and a DVOM. Any machine let alone modern car with computers can have all kinds of issues after they sit for years. If it was broke when it was parked it may have additional problems when you try to bring it back to life. Join local corvette or f body car club maybe a member can help you out. Good Luck