So, I bought a '92 chevy p30-based motorhome with 454 TBI. Decided to get an ASDL cable and some software to see what's going on. Not being sure what I was looking at, I pulled the whole ECM module out of the dash to find the ECM number (now that I know it is printed on the sticker, I wouldn't do that again). After re-installing it, the SES light is on all the time and I can't figure out how to reset it. TunerPro isn't showing a malfunction code.

ECM is 16147060. Anyone know what code I might have tripped pulling it out, and how to reset?