I no longer own the vehicle but I had a 2003 4wd Suburban that was the perfect vehicle for me except for one thing.I am an ASE Master Tech, retired, and especially knowledgeable about 2000 to 2006 GM Tahoes/Yukons/Escalades and the trucks in those years. I have an annual membership to ALLDATAdiy.com. I also belong to a forum where I can get info if I am stumped. I also have knowledge of the other makes and models but will not be as quick to respond if have to do some research. I was in the business for 35+ years, 10 as a tech and the rest as a service manager. This is my low mileage 2005 Z71 Tahoe.
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The electronic throttle they switched to that year starting screwing up at around 220K miles and sending it into limp mode, sometimes several times a day.
Apparently this problem was very common and all of the "fixes" were tried.
Several mechanics worked on it including a GM dealership mechanic. Replaced throttle body a few times, replaced wiring, checked grounds throughout the vehicle, etc. but it never was corrected.
I ended up selling it too cheap just to get it out of the driveway after spending a year messing with it.
I often wondered if there was a "fix" that myself or none of the mechanics could figure out and I cannot make myself buy another GM truck because of that experience.
Any thoughts? Thanks.