Is this procedure good for my truck, 03 Dodge Cummins? I am getting P0123 in the PCM and is in limp mode. For awhile after warmed up would drive ok. Was shifting in all gears, then it stayed in limp mode and local mechanic grounded the trans relay in the fuse box, then it shifts but no OD Now stays in limp mode when not grounded in fuse box. Replaced APPS with TIMBO's APPS at http://www.dodgecumminsapps.com/index.html, Made no difference.