Set Condition
WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) detects that the DCU Wake Up Signal circuit voltage is below a calibrated threshold. The PCM illuminates the MIL immediately when the diagnostic runs and fails. Diesel exhaust fluid injection into the aftertreatment system is disabled.