Code p0802 after flash

[johnj]

I flashed the truck today and after it was done i went and drove it and pullin around somebody to pass it acts like it goes into limp mode and the dash flashes range shift inhibited and sets the check engine light with code p0802 it never did this before. So i tryd all the other tunes and it does it in them too not really running a hot enough tune to limp the tranny jst about a sixty hp tune and it would still do this. Has anyone ran into this code after a flash or is this just a fluke and i have something else going on.

[LB72004]

p0802 = Transmission Control Module (TCM) MIL Request Circuit

could be any number of things. bad ignition switch, slipping clutches, etc. need a scanner that could pull the TCM code.

i would guess that the clutches are slipping. how many miles on the transmission.

60 HP is about the max that the transmission will hold above stock. run it above that and you shorten the life of the transmission