Not Ram specific but still relevant. The code also gets stored in the BCM if I remember correctly. I've read that some tuners know how to get around this but YMMV.
P1400-AFTERMARKET CALIBRATION DETECTED/WARRANTY COVERAGE CONFIRMATION REQUIRED
When Monitored and Set
Conditions When Monitored: This diagnostic runs continuously when the following conditions are met:
With the ignition on.
Battery voltage greater than 10.0 volts.
Set Conditions:
The Powertrain Control Module (PCM) software is unauthorized and does not meet factory OEM specifications.
An authorized Mopar or Scat Pak Powertrain Control Module (PCM) has been installed.
Default Actions:
This is a non MIL fault.
POSSIBLE CAUSES:
PCM HAS BEEN PROGRAMMED WITH UNAUTHORIZED OR AFTERMARKET SOFTWARE
AN AUTHORIZED MOPAR OR SCAT PAK POWERTRAIN CONTROL MODULE (PCM) HAS BEEN INSTALLED
Diagnostic Test
DETERMINE IF THE POWERTRAIN CONTROL MODULE (PCM) OR SOFTWARE IS FACTORY AUTHORIZED
P1400-AFTERMARKET CALIBRATION DETECTED/WARRANTY COVERAGE CONFIRMATION REQUIRED
When Monitored and Set
Conditions When Monitored: This diagnostic runs continuously when the following conditions are met:
With the ignition on.
Battery voltage greater than 10.0 volts.
Set Conditions:
The Powertrain Control Module (PCM) software is unauthorized and does not meet factory OEM specifications.
An authorized Mopar or Scat Pak Powertrain Control Module (PCM) has been installed.
Default Actions:
This is a non MIL fault.
POSSIBLE CAUSES:
PCM HAS BEEN PROGRAMMED WITH UNAUTHORIZED OR AFTERMARKET SOFTWARE
AN AUTHORIZED MOPAR OR SCAT PAK POWERTRAIN CONTROL MODULE (PCM) HAS BEEN INSTALLED
Diagnostic Test
DETERMINE IF THE POWERTRAIN CONTROL MODULE (PCM) OR SOFTWARE IS FACTORY AUTHORIZED