This is the part that could be failing. https://www.mymoparpart.com/p/Ram_2016_2500/By-pass-valve-COOLER-BYPASS-VALVE-64-LITER-67-LITER-TURBO-DIESEL/64477782/68186711AB.html?partner=googlebase_adwords_parts_motor_make_model_year_ram&kwd=&origin=pla&gclid=EAIaIQobChMI7rafnIej3QIVRrjACh3JVAEuEAQYASABEgJkf_D_BwE
You can check by grabbing the 2 pipes coming out of it after driving a while. If the ones heading forward to the transmission cooler are cold, then it is stuck closed.
You can check by grabbing the 2 pipes coming out of it after driving a while. If the ones heading forward to the transmission cooler are cold, then it is stuck closed.