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2007 GMC Yukon XL Denali - Won't start some mornings - Battery see
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Question
Big Tom
My Yukon is having issues and it's annoying my wife dearly.
It's a '07 Denali with 6.2L, we have some pretty harsh winters here in central Canada and it's got a bad habbit some mornings of just not starting. You get in, lights all come on, everything seems to have tonnes of juice vehicle was plugged in etc, and try the key nothing. Sometimes like today it fires up zero issues, wife drives it all around town doing errands then she'll stop in at one store, come out a few minutes later and won't start. So it was running/charging all day... then for no reason won't start.
To me, it's like the computer isn't engaging the starter. You hook up a charger or boost from someone and within seconds of hookup POOF it starts zero problems.
Do these trucks have some stupid voltage sensing that won't allow the starter to engage unless it sees a specific voltage? Because that's what it seems like to me it's doing, the voltage isn't quite "good" enough and it won't even try. You hook up a charger or boost and the voltage rises up enough it allows the starter to engage and away it goes.
It did this with the old battery it had when we bought it, so I swapped the battery and this is the first winter and it started doing it again.
I'm out of town of course and my wife is furious it won't start again this morning, so I told her to goto the store and buy twin 1000CCA batteries and this weekend I'm going to wire dual batteries in it and extra ground cables. If it doesn't cure the problem or at least stick a huge bandaid over the problem I might pawn this truck off cause when it's -45C out and your truck doesn't start, it's not worth keeping.
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