2005 GMC Yukon Denali Q&A

2005 GMC Yukon Denali Question: 05 Yukon Denali Speed Issues

My 2005 Yukon Denali wont exceed 35mph. Why is this? It will go up to speeds as high as 45mph if shift into 4wd -
Answer 1
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 2
Its sounds like you transmision is taking a dump on you. You shouls go get this checked out. -
Answer 3
how do you shift into 4wd if its all wheel drive? -