You may have corrupted memory in the SKREEM, that is, it knows about that FOB but there is something 'wrong' with the memorization of the FOB's data.
Yank fuse 37 and leave it out for a LONG time, maybe 1/2 hour. I THINK the memory in the SKREEM that supports the FOB's codes is in RAM and it will 'forget'.

I know of no other way to clear it and am not even sure THAT will clear it, but if you take the BATTERY out of the car for a while, the SKREEM forgets the FOB so why not try it?

If the FOB is transmitting, gotta be some sort of confusion or corruption. I suppose the FOB could be goofy, if you have another one, try it.