GM Security lockout reset procedure
https://www.youtube.com/watch?v=5feL05TyLtI
https://www.2carpros.com/questions/2003-gmc-yukon-xl-5-3-vortec-anti-theft-deterent-light-on-dash-board-stays-solid-2
owners manual
https://my.buick.com/content/dam/gmownercenter/gmna/dynamic/manuals/2003/gmc/yukon_xl/2003_gmc_yukon_denali_xl_owners.pdf
what is the purpose
https://www.quora.com/What-is-the-purpose-of-the-flashing-red-LED-light-on-the-dashboard-of-cars
SOURCE: location of fuse box/panel for 2004 yukon denali xl
There are 2 fuse panels in the Denali.
One is a panel on the drivers side, its on the dash but facing the door.
The ohter is under the dash and above the pedals, this one is much tougher to access.
Your Owner's Manual should tell you where the fuses are that you need to access.
SOURCE: 03 Yukon denali park brake warning wont turn off
hi for info the brakes warning light on dash is also an indication that brake fluid level is low? or there may be a leak resulting in fluid level drop ? also considering age of car you may need to inspect brake pads wear ? if your car has low brake pads wear indicators attached to pads ? or the hand brake switch req's checking to ensure it is being pushed to off position when h/brak is down ? so fluid level low is the obviouse 1st check as fluid will displace from reservoir as pads wear low hence the level indicator on fill cap trips on may i suggest if it is low level b4 you top up? check your b/pads if you have not done so recently? or replaced since new ? hope this helps you locate problem best wishes from the uk
SOURCE: 2005 gmc yukon xl denali service ride control
it has to do with your air ride suspension best bet is take it to the dealer there is probably a problem with a level sensor. hope this helps you
SOURCE: 2003 GMC throttle position sensor
I had the same problem with my 2003 denali and came to find out that it was the battery causing the problem. the battery with sufficient power will dictate the tps. if the battery is low or bad, it won't have enough juice to allow the tps to. work. get your battery checked.
SOURCE: 2003 GMC Yukon XL Denali Service Ride control info
leaking suspension air bags is the most common cause, but the system can be tested for trouble codes, I suggest u do so, only the dealer can do this, but guessing about what the problem is can get very expensive very fast.
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