Dodge 2012 Ram - Manual (Page 400)

shift the transmission down to ERS 3 (the added under-
drive gear). Once in ERS mode, tapping ERS (-) or (+) will
change the top available gear.
To exit ERS mode, simply press and hold the shift lever to
the right (+) (console shift) or the ERS (+) switch (column
shift) until “D” is once again displayed in the shift lever
position indicator in the instrument cluster.
Column Shift Lever
Console Shift Lever
398 STARTING AND OPERATING