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ok i got it to work.....I guess after the locks cycled the connection wasnt good enough. I just tried it again and held the jumper wire more securly in place and it worked....

i agree with the headgasket diagnosis

I have a 99 yukon and am having problems programming the new keyless pad. I used a jumper wire across the OBD2 connector and the locks cycle showing that it is in program mode, I then hold down the lock and unlock buttons but nothing happens even after a minute. Do all the doors need to be...

they should fit fine. I had the 02 wheels on my 99 before I got my new wheels no problems. I have 285/75/16 tires on mine now with no problems. 265s come stock on the Z71s, they will fit without rubbing and shouldnt be a noticeable speedo difference either.