Coltonwalters
New Member
I have an 02 lb7 it has been ever deleted straight piped everything else is stock as far as I know other than me buying a bully dog gt tuner and installing on the truck but 4 days after tuning it with bully dog trans went to limp mode and screen on tuner is saying it’s limped to 4th gear… I have replaced the valve body all shift solenoids pressure manifold switch internal & external filter pan gasket and all new fluids.. once I got it all back together and drove truck it shifted perfectly as if it was a brand new transmission made it about 51 miles with it working perfect and as I went to slow down to turn off interstate it went back to limp mode… after that I have replaced the Netrual safety switch have changed the speed sensor on t case haven’t replaced the other 2 on trans yet and have also changed the tcm out and it is still in limp mode I have also checked all ground connections and have checked the entire harness from tcm to transmission and even replaced the external solenoid harness plug on trans where harness plugs into and can not figure it out.. would be greatly appreciated if someone could help me out with it because it has became a major head ache…