07 Yukon Electrical Mayhem

[mentalattica]

Hello Everyone,

I just purchased a 2007 Yukon today, I test drove it and checked it out as best as I could before buying.

Fast forward 20 miles after purchase:

Taking a sharp highway ramp, "stabili-trak off" flashed followed by a few chimes. Then after parking, it would not restart, nor would the remote start work but the battery was fully charged. So on a whim I released the emergency brake and it started. So at this point I thought "maybe it won't start with the emergency brake down," which is a ludicrous idea. BUT the check engine light was on. So I grab my ODB reader and it threw codes U0073 and P0700 which I still haven't looked up yet. Then on the way home I hit a stretch of bumpy interstate and every single bump caused the "traction off," the speedometer was fluctuating 10-15 mph back and forth while maintaining the same speed, other gauges were jumping around like crazy also, followed by a bunch of chimes that literally scared the hell out of my family and I.

In my opinion, it's an electrical problem. Hitting those bumps at highway speeds and seeing the Yukon's reaction kind of confirms that to me. Anyone have any ideas? Is there any electrical problems that are known with these things? My family won't get back into it any more after this, and I have to drive it unfortunately. On a smooth or even city roads, it drives like a champ and doesn't have a trace of any problems, but now I'm really worried. It pisses me off after you just spent 24 grand and this happens on day one.

I purchased an extended warranty even though the Yukon has well under 50k mi, so I'm going to take it to the dealer after I receive my warranty policy, but I'm also a DIY kinda guy so is there anywhere in specific I should look to see if there are loose connections?

Thanks and sorry for the long winded post.