As long as you engage your hitch with enough weight from it getting loose why not back the car up a foot and a time till you get the tongue weight you need and the sag goes out use a heavy duty bathroom scale from online goes to 550 pounds to get the proper hitch weight and load level you need...
I have had a 2004 Sierra 5.3 and Currently own a 2003 GMC Yukon XL both motors presented the say as yours and on both truck the same answer after tracking it all down. On the Sierra I put plugs in, Tried replacing the injector on the 2 cylinders that were misfiring and also a coil on both of...
THANK YOU for coming back and posting your answer to the problem! I had the same thing on an 03 YUKON XL and I unpluged the Purple connecter above the brake pedal and cleaned it and plugged it back on and so far so good. NO more Hatch Open Alert. Thanks again.
Wes...
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