2003 Yukon downshifting problems

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KenG

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I bought a 2003 Yukon with a 4.8 engine and a 4L60E transmission. I live in the Adirondack mountains in upstate New York and I have a problem that I have never heard of. Got the cruise on 60 and I'm heading up the side of a mountain on a road and my truck will downshift from overdrive to third and then down to second in a matter of 5 seconds. I've never heard of this in my life, would anybody have any ideas?
 

Scottydoggs

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try the same rt with out cruise control.

CC will keep giving it gas till its picking up speed, a large hill can slow you down and then its going to floor it if its not gaining speed back fast enough.
 

rockola1971

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Its not a problem. Its the cruise causing it. Your cruise is set for XX MPH and you are going up a steep hill/mountain in a big heavy SUV. The computer sees the speed drop alot and was programmed by you to maintain XX MPH so it gives more throttle which causes a quick downshift and since that didnt solve the speed issue it caused another downshift and I bet the RPM's jumped up alot too. Turn the cruise off going up steep inclines and your "problem" will go away.
 

Fless

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Its not a problem. Its the cruise causing it. Your cruise is set for XX MPH and you are going up a steep hill/mountain in a big heavy SUV. The computer sees the speed drop alot and was programmed by you to maintain XX MPH so it gives more throttle which causes a quick downshift and since that didnt solve the speed issue it caused another downshift and I bet the RPM's jumped up alot too. Turn the cruise off going up steep inclines and your "problem" will go away.

^^^ This. Mine acts the same way if I let it.
 

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