One thing they CAN'T do is the SKIM codes and matching the modules (IF it has SKIM) Let's not forget PINION FACTOR also. Otherwise your speedo no worky!
Your ruining any chance of diag Time
On a lighter note...TN is absolutely correct....
PCM's Are no longer plug n play by any means
From My experience, 601 doesnt happen by itself......And a competent tech is required to find the root cause of the failure....No parts store, dealer or internet vendor has EVER accepted returns on electrical parts, so Once its yours, you are Stuck with it.
I thought it was against Forum policy to "Peddle Your Wares"???? Isnt that called...Um..Idont Know...Uh...SPAM!!!????