2007 Ram 1500 SLT 4X4 stops shifting after 10 min

[kjfitzaz]

210K miles, about 100K since last trans service. A couple days ago I felt a thump going around 60. Dropped out of overdrive. RPMs went from 1500 to about 2500. After that stayed in 3rd gear, not downshifting. After restarting, worked okay for 6 or seven min, then happened again. Codes says "shift solenoid A".
Does anyone know the most likely cause. Bad solenoid, dirty oil, TCM?. any help appreciated.

Thanks, Ken

 

[SilverStreak88]

Solenoid likely went out or is sticking, you'll have to get the valve body apart to get to it. When the computer sees the trans having a hard time getting into a gear it will lock that gear out and only allow up to that gear. I would say that if you're going into it with the mileage you might as well get a rebuild.