Q: 05 Yukon Denali Speed Issues on 2005 GMC Yukon Denali

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My 2005 Yukon Denali wont exceed 35mph. Why is this? It will go up to speeds as high as 45mph if shift into 4wd
(3) Answers
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.
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