I am having problems with my transmission. I believe that it's in "Limp mode". It is shifting, park and reverse work, but no matter what gear I am in I cannot go faster than about 20 mph. I've tried to manually shift and it won't exceed 20 mph but just revs. There are no trouble lights on the dashboard. When I stop and engage the "Winter Mode" switch. The truck won't move, just revs, no gear is engaged.
The fluid and filter have just been changed.
Any help would be appreciated.