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    Is voltage too high?

    Howdy I have an 06 Yukon XL 1500 4x4 and I have been trying to figure out a misfiring on all cylinders when the air conditioning is off when on they stop soooo yesterday I hooked up to battery to check voltage all is fine but when engine running if I turn air on to engage the coolant fans it...
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    06 Yukon XL 1500 4x4 Looking for help/advice.

    Howdy I decided to reach out to the community in a last ditch effort to figure out this dang truck...I am getting CEL with p0455, p0443 codes idles rough after warmup so I replaced the evaporator vent valve canister and solenoid then I also replaced the solenoid vent valve on top by throttle...
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    Engine light on, but not so sure the codes are pointing to the culprit

    Howdy, so I recently bought a used 2006 Yukon XL 1500 4WD and The check engine light was on, but it seemed to be running relatively fine etc, so I hadn't worried too much til the last couple weeks, I got the codes checked and they are showing a P0449 which means evaporative emission control...
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