Quote Originally Posted by Juanmiguel View Post
If I remember correctly, I think the programming mode was once refered here to as when the DIC would flash in 0 when you opened the switch?

The other day I put a stock 01 impala LS PCM on my car to do a full write and the DIC would flash 0 all the time.

If that's the case, I think the problem would be having the incorrect OSID loaded in your PCM.
Basically the flashing 0 just means you have no PCM communitation, which could be anything... The last GTP I built had that "problem" (it wasnt actually a problem, just something I noticed) because I had not connected the large transmission ground that runs to the battery.