Theory Of Operation
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) Monitors The Random Access Memory (Ram) Functionality And Will Set This Fault If Errors Are Found. The PCM Will Immediately Illuminate The Mil Lamp And Flash The Etc Lamp After The Diagnostic Runs And Fails.