Transmission problems?

[V10MOJO2TOW]

2004 H2 73K miles on it.

posssible issue started this evening. from a standstill accelerates very sluggish and labored to get going. it feels similar to a vehicle that has brakes on. once moving along after say twenty to thirty mph seems fine but do notice higher rpms than norm while driving thereafter. engine light came on after about an hour of this. goign to do obd to see code and check tranny fluid.

any input or opinions?

i sure hope its not a failing tranny, i would assume they arent cheap and i am waaaay out of warranty...