Tow-haul Shift Points

bagger97 · January 3, 2011

I have a 2011 Sierra 5.3 w/6sp auto. I noticed that when in Towhaul mode is won't go into 6th gear (not towing anything). If I disconnect the battery to reset the CPU would that make a difference. If I turn off t/h it will drop into 6th and stay if I turn t/h back on. Just thinking the computer needs a reset. Thoughts?

gmtech4 · January 3, 2011

you will not be resetting anything,its pprogramming and thats it ,no,you cannot change it thru GM.

tuners won't either

8.1HD/ALLISON · January 3, 2011

That is the point of tow/haul mode, to protect your transmission. It won't let you tow in 6th.

music · January 3, 2011

If the truck will tow the load comfortably in 6th gear, you don't need tow/haul mode engaged.

gmtech4 · January 3, 2011

If the truck will tow the load comfortably in 6th gear, you don't need tow/haul mode engaged.

what ????

it would never stay in that gear ,it would constantly go in and out of that gear creating heat and clutch wear ,

tow/haul changes all line presssures and shift points to save itself from thoughts like yours robert,

the old 700r4s and the 4l60e and 80s without a tow haul feature was recommended to tow in 3rd which is 1-1 ratio

music · January 4, 2011

If the truck will tow the load comfortably in 6th gear, you don't need tow/haul mode engaged.

what ????

it would never stay in that gear ,it would constantly go in and out of that gear creating heat and clutch wear ,

tow/haul changes all line presssures and shift points to save itself from thoughts like yours robert,

the old 700r4s and the 4l60e and 80s without a tow haul feature was recommended to tow in 3rd which is 1-1 ratio

??? If it won't stay in that gear, then it isn't "towing comfortably in that gear". The OP specifically is trying tow/haul when not towing anything... thus my response.

Not sure about the 6-spd owner's manual, but mine states that you can tow in "D" if the transmission isn't shifting excessively. It also states that tow/haul is designed for use when towing heavy trailers. Are you saying that towing/hauling light loads requires tow/haul mode on the 6-spd?

bagger97 · January 4, 2011

OP here, you all seemed to miss the question. Is the 6 sp an adaptive ECM i.e does it learn your driving habits and will it reset if the battery is disconnected. I know Furds are like that, don't know about GM.