Recently made a copy of my original key with an eBay-purchased blank with chip. Programmed using the Toyota Smart Keymaker and programming went just as planned and it works great for starting the truck. No problems.
When I start the truck with either the old or new key it flashes the immobilizer light on the dash twice continuously, even when driving. Still starts fine and everything else works normal, but the light flashes twice continuously while running/on and is solid-on when off (just like before).