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you might want to get the computer reprogrammed and for the codes you pull, the dts codes are generic and they will or should have every code that has ever come up. after extensive research and reading 100's of forums from various companies I found that the "Hypertech Max" Programmer was just what I was looking for. few questions, where do you fuel ur suv??? what Octane do you use 85/87/93??? who does your oil changes???
you might want to check all Fuse Panels in your SUV, their are 3 in total I don't have my manual with me but it shows you where everything is in the "owners manual" that comes with the suv
although I do not have the same truck or same brand that you have, I did have the same problems, I have a 1997 ford expedition Eddie Bauer with full air suspension. and the rear was shot, it would've been extremely expensive to repair the problem then I did some research where you can either upgrade to a whole new air ride suspension or you could look into an aftermarket suspension which is "coil over/shock" Front/back it varies on price for me I paid round $400.00 and change with 2-3 hours install. where as later on you can still add the air bags in if you still need them. considering you are driving a V8 I'm sure that you have better things to spend you money on then the dealership right??? I went through amazon and they were the cheapest for the full kit and extremely fast with any answers I had.
the switch is usually in either side of the kick panels or under the dash beside the OBd2 reader
disconnect the battery and powerdown the electrical in your car, it usually has a 5-10 minute back-up power supply.
if its an automatic then you might need new o2 sensors
"limp mode" is when their is a failure in the electrical system, from your description have your alternator looked at and have the grounds in your car gone through
have you chanced anything in your truck??? like stereo anything to do with the electrical??? theirs a good chance that your truck might be sensing you are stealing it, it wont come up in any readers what so ever, its what mechanics like to call "dealer only code" The truck will still run under normal instances but it won't run accordingly. As well have the key looked at it might need to be re-coded.
if one side is lower than the other or the front is lower than the back vise versa you might need to check 1 or more things, if you car has air ride suspension you might need a new modular and if your car has chock system you might be rolling on broken shocks, if not corrected the broken shock will rub inside of the tire
with the newer cars/trucks you have a fuse for anything that needs power, if the fuse is blown 1 or more things will not work.
anything to do with codes in general usually means that your car needs to be scanned to find out where the problem originates from.In most cases your car is letting you know something is wrong.