There's no "chip" in the key as has already been mentioned. It's in the tumbler. This situation was created when you installed the wrong tumbler in the column.
Also helps to not guess what year the truck is - confirm via VIN 10th digit, because it matters. 1998 is first year for Passlock. 1997 does not have it and the tumbler will not work with the Passlock system.
Don't feel bad.. many of us have been there. My first experience with Passlock was on a '99 parts truck I was trying to get running and didn't have the key, so I swapped a tumbler, too - and the bulb for the SECURITY light was burned out already so I didn't even get that warning.
Richard
Ah, there's my issue. See I have a 97 parts truck cab too, that had a good column with cylinder and keys, and I thought why spend money when I already had the part. Figured it wouldnt changed one year to another, but I guessed wrong lol.
And I thought 98, because my title and the lot listing at the auction both said 98, but my bill of sale and the owners manual in the glove box both say 99, so in not sure. I'll decode the vin later, and find out for sure
So your saying I'll never get the truck to recongnise the key because the tumbler is the wrong yea, so I'll have to go buy a tumbler for a 98 or 99, or whatever it is, and itll work? Then I can do the relearn thing?
Now si ce you've told me what that is, I've looked it up a little to see other ways of fixing it. Theres a bunch of different hacks to make it run, but they all sort of involve "repairing" it. Is there anyway to just get rid of it or bypass it, like just unplug it, or cut it out and jump a wire sort of thing, or would the computer have a panic attack?
I'm a lot more familiar with eailer 90s chevys than I am the late 90s one, but I'm even more familiar with 73-87s, so the whole computerized everything thing is a whole another world to me. Sorry for my ignorance towards technology, haha. I'm learning... slowly...