My friend found this on an Envoy forum.
Guessing this is true for the Denali? I told her that it was probably just running ****ty to help prevent problems, so I guess she just has to go to a dealer.
Not sure if this is the right section in the forum, but it seemed to be the most appropriate. A friend on mine has a 2003 GMC Yukon Denali XL and a few lights came on today. The first was "ENGINE POWER REDUCE" and the second was "STABILITY DISABLED," atleast I believe that is what they were...
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