Thenameless
Newbie
Thanks to everyone who always takes a minute to help people like myself stumped. It sure gets frustrating when all the problems happen simultaneously. I need to start with one and see it through. my 4l80e won't shift to fourth unless commanded by hptuners. I cannot command any function for the lockup either. I have added the input sensor and pinned to pcm as advised, double checked. Tried 2 segment swaps with same os just to be sure. Same results. Is there something I need to do with a brake switch wire to the pcm? My harness is standalone and not much is grafted between the 98 rcsb and the harness. I have put the truck on the hoist and signaled the solenoids with hptuners and have good 1-2, 2-3, 3-4 grounds when commanded. I think the pcm is looking for something that I haven't connected. I do have logs too if that helps.