04 silverado remote start

BINGO! Swapping the tach signal to the cluster and relearning it fixed it. I guess I'll just add all the door triggers w2w and diode insulate since the module isn't handling all 4 doors... You know if this is a common thing? -Chris

I primarily use iDatalink bypass modules.  The few INT-SL and INT-SL+ modules I have used were in R/S w/Keyless entry installs ( no alarm ) so I wasn't even using the Door Status signal.  I do know on some other GM vehicles, the bypass modules can only monitor the front doors and the rear doors must be hardwired.  You situation with only the drivers front door being monitored and then for only one cycle is strange.  Maybe it has to do with the version of firmware loaded on the INT-SL+ ( I usually use the FlashLink cable to re-flash the latest version just prior to install ).   Perhaps a call to Fortin Tech Support is in order.  They are very good and might have info on or a solution for your problems.Soldering is fun!