Ram Trucks 2015 ProMaster - Owner Manual - Manual (Page 216)

You can switch between DRIVE and ERS mode at any
vehicle speed. When the shift lever is in the DRIVE
position, the transmission will operate automatically,
shifting between all available gears. Moving the shift
lever to the ERS position (beside DRIVE) will activate
ERS mode, display the current gear in the instrument
cluster, and maintain that gear as the top available gear.
Once in ERS mode, moving the shift lever forward (-) or
rearward (+) will change the top available gear.
To exit ERS mode, simply return the shift lever to the
DRIVE position.
WARNING!
Do not downshift for additional engine braking on a
slippery surface. The drive wheels could lose their
grip and the vehicle could skid, causing a collision or
personal injury.
Instrument Cluster Display 1 2 3 4 5 6 D
Actual Gear(s) Allowed 1 1–2 1–3 1–4 1–5 1–6 1–6
NOTE: To select the proper gear position for maximum
deceleration (engine braking), move the shift lever into
the ERS position, then tap it forward (-) repeatedly as the
vehicle slows. The transmission will shift to the range
from which the vehicle can best be slowed down.
214 STARTING AND OPERATING