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Discussion Starter #1 (Edited by Moderator)
i have a gmc 2015 lml that will crank but won't start just recently. it has has not started three times now, i thought it was the DEF or something to do with that. i was informed it will run but you can't drive so fast, then i thought it might be the fuel pump. when i pumped it up i didn't see any fuel come out of it so i figured it was good. i just don't know what else to look at, help please!!!!
 

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I highly doubt it's your CP4. I've never heard of one causing a no start and then running after. Is it cold when this issues happens? What do you do to get it started after it fails to start?
 
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