05 Yukon Denali Speed Issues on 2005 GMC Yukon Denali

My 2005 Yukon Denali wont exceed 35mph. Why is this? It will go up to speeds as high as 45mph if shift into 4wd

by in Chicago, IL on April 01, 2009
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3 answers
ANSWER by , April 02, 2009
Do you have any Service Engine Soon Lights or Service Vehicle Soon Lights on? If so, theses lights will mean that a computer code has been stored and this code can help you determine what the problem is. It sounds like your vehicle is in some kind of a 'limp home mode ' that is preventing it from going normal speeds.
ANSWER by , April 03, 2009
Its sounds like you transmision is taking a dump on you. You shouls go get this checked out.
ANSWER by , March 14, 2010
how do you shift into 4wd if its all wheel drive?