I have a 2013 ram 2500 with 6.7L and am looking for help on why my traction control light and service 4 wd light are on. All 4 wheel sensors are working and showing correct speeds so it is not a wheel sensor issue. I took it to the dealer and they figure it is likely the dtcm that is not working as the correct voltage is not coming out of it causing the issue. They estimated this would likely fix the issue but could not guarantee it. Is there other way to test the dtcm or other methods to verify before going out and getting a new or rebuilt dtcm?