Question about 1998 Chevrolet K1500

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Yes im trying to change the ecm on a 98 silverado z71. i just bought it new from local parts store there was a tag on it that said you must install knock module from the ecm that came out so i did and hooked it up and now the security light is on.it will crank but as soon as it does it shuts right back off need help...

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Truck not recognizing the ecm might have to have hooked up and completely reprogrammed call with chev dealer and ask tech about problem when security mode kicks in sometimes only can be reset thru a mech /tech and ecm might have to b programmed to your truck

Posted on Sep 26, 2009

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Reprogam security key by turning key on,momentarily engage starter,leave key on for ten min(security light will go off) repeat 3 or more times,after third time attempt to start within 5 seconds of cycling key

Posted on Apr 27, 2013

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