Re: Never ending check engine light 2014 GC
So finally following the 4th software update that was attempted on my GC, they determined there was a larger problem, a "valve body" was determined to be defective. Come to find out, the valve body on this truck is the entire shift valve system and the Transmission Control Module, all in one. They had to completely reinitialize the module once installed, some extensive 15-20 miles driving exercise as well as software programming. Now the truck shifts perfectly up and down the gears. The only caveat is that there is still a little more abrupt shift into 1st when coming to a stop than I would like, but they attribute this to the Variable Valve timing keeping the revs slightly higher than ideal for this downshift.....sounds a little fishy to me.