Everytime I start up my 2010 Yukon Denali, the clock on the panel reads 1 hour more? I reset it and the next time that I start it, it changes again.

Procedure In Owners Manual--If You Don't Have One, Do Yourself A Favor and order one from GM Dealer (parts Department)

Your ground wire may be off....

Most clock adjustment buttons are located on the GM radio below the volume and on/off knob. Look for the hour and minute buttons below and press corresponding buttons to either set the hours and minutes or both. There will either be AM or PM on LED window indicating morning or night.

The check engine light is reset with the scanner. You can also try disconnecting the battery for about 1/2 hour and then connecting it again. If there is a fault code the light will come on again.

you need to reset the immobiliser every time the battery is disconnected.

drive the auto for 1 hour then take it to the dealer and have them check it out do not turn off the vehicle when you arrive leave someone in side until they can service you sittuation

look in the manual......turn the ignition to the on position not starting it of course and then pump the gas petal 5 times then the light will blink a few times turn off then back on...problem solved

Try going into the manual adjust in the config on the main screen and take the auto time adjust off. Either that or just wait 6 months until it's right again.

you have a bad ignition switch but if you turn key on for ten minutes until the light stops flashing then turn off key then try to start this should reset the security system

check for loose battery connection. or maybe a cable going bad. they can corrode inside and the copper wire will turn green