2009 GMC 2500Hd w/ 6L90E
I was hoping someone could explain the differences to me.
When I look under Transmission -> Shift General, there is a Shift Pattern Type. There are two (presumably regular and tow/haul) and under the drop down there is:
Normal
Performance
Cruise
Winter
Trailer
Load Mgt
Warmup
Pattn 1
Pattn 2
Pattn 3
Pattn 4
What exactly do these mean? I selected performance but now when I put the truck in M it doesn't display the gear and the buttons don't seem to do anything.
Additionally under shift pressures there are:
Pattern X
Pattern Y
Pattern Z
Are these just 3 "maps" you can adjust or is there something specific about them?
Any help appreciated.
-M