2500/3500 AIR SUSPENSION SYSTEM
This air suspension system is a rear leveling ride
height system. The main purpose of this system
is to maintain the truck’s rear ride height level.
There are two selectable heights that can be
chosen based on your operating conditions.
The system requires that the ignition be in ON/
RUN position or the engine running with zero
vehicle speed for all user requested changes and
load leveling.
Normal Ride Height (NRH)– This is the standard
position of the suspension and is meant for
normal driving. It will automatically adjust
to maintain the rear ride height as conditions
change.
Alternate Trailer Height (A TH)– Lowers the ve-
hicle approximately 1 in (25 mm) for a level
truck, to be used as required while trailer tow-
ing. It will automatically adjust to maintain the
rear ride height as conditions change.
NOTE:
• Most 3500 models will not lower to Alter- nate Trailer Height (ATH) when unloaded.
• Refer to “Trailer Towing” in “Starting And Operating” in your Owner’s Manual at
www.mopar.com/en-us/care/owners-manual.html
(U.S. Residents) or www.owners.mopar.ca
(Canadian Residents) for further information.
Ignition OFF Behavior
For a predetermined amount of time after the
ignition is off the air suspension may adjust to
maintain a proper appearance. Trailer Decoupling/Unloading
The air suspension system will maintain load
level (lower/exhaust only) for up to 10 minutes
after the vehicle is turned off. This allows for
easy removal of a trailer and/or load from the
back of the truck by maintaining the ride
height. After 10 minutes, you will need to turn
the ignition to the RUN position for the air
suspension to maintain the ride height.
If the air suspension system is disabled using
the settings menu (Tire Jack Mode, Transport
Mode or Alignment Mode), the system will
remain disabled when the vehicle is turned off.
Reactivating the air suspension can be accom-
plished via the settings menu or by driving the
vehicle above 5 mph (8 km/h) for Tire Jack
Mode or Alignment Mode or 16 mph (26 km/h)
for Transport Mode.
Alternate Trailer Height Button
RAM 2500/3500
