Originally Posted by captain planet
It sounds like P-hat may have the answer. Hey P-hat, was the wiring harness a pricey fix?
I don't recall and I probably don't have the paperwork anymore. I was just relieved to have it fixed after a couple months of another dealer not being able to fix it.
I'm not stating with certainty that what I mentioned is your issue, I'm just stating my experience and some of the similarities. I KNOW our SES light was on b/c the 'emissions' people wouldn't renew our registration without it being fixed.
As you are doing on this forum, go to a Suburban/Yukon forum and do some searching/questioning and you may narrow it down.