This truck was o/h around a year and a half ago. Its current problem just started last week.
Came in with P0742 - TCC stuck on
Problem
Truck is going into lock up too soon. At first thought when shifting to second. However watching the scanner the pwm % starts going up as soon as truck starts moving. Appears to happen right at the 5 mph mark. We changed both L/U and pwm sol. and no help ( It also has the sonnax valve installed). Tried a different computer ans had it flashed - again problem still there. Any ideas ?