My friend called me and asked if I could take a look at his truck it keeps going into limp mode while driving. The truck is a 2003 with a 5.3L, the DTC that came up was P1516. I watched the TAC "throttle Acutation Control" functions, when the truck goes into limp mode it throws a fault for "State15 remote acutation". I'm thinking his problem is in the TB with the drive by wire controls, which after looking appears to be non servicable! Has anybody had any experience with this? I would feel really bad if he spent the money on a new TB and that did not fix it.
PS: We did the wiggle test, checked for broken wires, and the grounds.
Thanks
Shawn