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Looks like 2 different problems. Have your truck scanned for free at Autozone and see what codes pull up. The guage is probably a bad stepper motor on the back of the cluster.
It is very possible that the stepper motor that drives the gauge is going bad and needs to be replaced. There are services that repair clusters, check on Ebay.
one of the gauges must a fluxuated enough to have the computer turn the light on,I've seen mostly gas gauges fluxuate,but train your eye where the voltage is in normal mode because it will still look like the needle is up there but it may only be 11 volts instead of 13-14 volts running.
Is the check engine light on? If so, rent a scanner and read the code(s) and proceed to a repair. If no light on, it's a guessing game. Did it run out of fuel even though the gauge showed some remaining? Do the lights or horn work (a dead/discharged battery)? Does the engine turn over with the starter?
Take it to Autozone . They do the free diagnostic and with it being a check guages issue it will pinpoint what the actual problem is so you know exactly what you need to fix. Good luck
Yoyu dont mention the mileage on your Yukon but low oil pressure will indeed light the CES light when it reachs o psi. Have you checked your oil? Have you changed your oil and filter. High mileage and poorly maintained motors will eventually wear out and develope low oil pressure. A tempary cure would be to use a higher weight oil 20w50 will get a few more miles out of the old gal if indeed the cam, main or rod bearings have reached their service limit.. Good luck
go to the battery follow the cable that dose not go to the starter the other cable will go to hard piont that is the feed for the fuse box check that connection
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