same for me, apart that I live in Mexico and hard to trust garages here, even the dealership looks dodgy! The sales rep even told me, on-board computer don't get reprogrammed, you have to change it!!! WTF!! What the point of it being a 'computer'??
Got a 2004 Colorado LS 4x4 - not too sure of mileage.
Left for urgent trip abroad and left keys with a friend to keep it running but he didn't...
Anyways, had a new battery as other one died dry but car won't start now. Got the Passlock light on dashboard. Tried the 'start leave for 10' then off for 30 seconds' thing but no success.
Now, I had enough and dropped the car at dealership. Waiting for diagnostic.
Any help would be highly appreciated.