Engine Performance problem
2007 GMC Yukon V8 Four Wheel Drive Automatic 40700 miles
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I have a 2007 Yukon, 5.3L and have recently had problems with:
1) Engine Oil Low Light comes on but oil is full
2) Engine Light Goes on and stays on
3) Service Stabilitrak message comes on sporadically and when it does shifts very hard
4) Traction Control Off message comes on sporadically

Dealers blames this on E85 fuel and really don't have a fix for it. They keep telling me to run regular fuel and they'll reset the computer after a couple tanks of gas but running regular fuel compared to E85 is quite expensive when you fill up 2 to 3 times per week. Have you heard of this before?

this is a pretty odd diagnosis.what code did they find?what did they do to repair it?it does not seem like they put much effort into fixing this.what did they tell you about E85?running E85 should not affect much.post back with the code or codes.I think there clearing the code as an alternative to fixing it.I work at the dealer and nobody has ever complained about E85.none of this makes sense??