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2005 chevy trailblazer_ls
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I bought a 2005 Trailblazer and shortly after I bought it I broke the key fob and am just now getting around to replacing it. I’ve tried 2 different key fobs now and they won’t program, it’s like I can’t get into the program mode. I follow the steps and shortly after the locks cycle they cycle again and the horn honks. My rear wiper, defrost and license plate light all work fine. What could it be?
 

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2004 chevy trailblazer_ls
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Same thing happened to me. I first tried Autozone for the key fob, followed all the steps, and it just wouldn't program. Took it back, went to the GM dealer and bought a fob, they used a tech 2 to program it and it worked.
Cost about $150.
 

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Did anyone solve this - my 05 TB is doing the same thing .. goes into programming mode but within seconds cycles again ???
 
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