The Hummer 2005 H2 sut shows service air bag Now I will check with dealer but could this be expensive

Your vehicle is equip with air bag system. You probably experiencing an air lost due to air bags leaks or your leveling valve is exhausting air at the exhaust port. Here is what you do. Spray soap with water on spray bottle and spray around the air suspension area. when you see bubbles coming out that's the leaks. fix it. Good luck.

You can't. You need to see the dealer to have the system scanned for faults.

actually just fill till it comes out of the hole but generally will hold less than 2 quarts. make sure that you have the correct diff fluid and any additives that it requires. dealer can get you the correct additive. cheers

i bought a new complete pump tray with all controls from red neck auto parts online for $650.00 new 1 year warranty

When I replaced my air suspension bag it reinflated upon starting the Hummer. I did not have to reset anything. You may check the fuses in the event it ran so much to blow one and prevent the compressor from burning up.

u need to change/service the air compressor in ur car.
or it might be the air bags/sensors thats located next to the rear tires.

is the car low milage ? by taking it for a drive you will be able to tell if everything works and stepping on the brakes lightly you will be able to tell if there is any noise coming from them.. take it on the road and step down on it to see if it accelerates good.. make sure it shifts smooth and there should be no smoke coming from anyhere.. check under the hood to see if it is clean everywhere. this tells you if it has been taken care of .windshield broken? check for chips here also.. interior clean ? this lets us know if its been taken care of also... if its late model and low miles you probably will be ok.. driving it will tell the story about how it is going to run ... holler if you have more.. Jerry

all you need to do is make sure you disconnect the negative battery terminal.reconnect after 5 mins. if it doesnt go away, then you have a problem with airbag system.

C0563 - Calibration ROM Checksum Error
Not sure what it means but thats what I found when I looked it up