Ram Trucks 2015 ProMaster Commercial - Diesel Supplement - Manual (Page 26)

As an added safety feature, your vehicle has been
equipped with a Tire Pressure Monitoring System
(TPMS) that illuminates a low tire pressure telltale when
one or more of your tires is significantly under-inflated.
Accordingly, when the low tire pressure telltale illumi-
nates, you should stop and check your tires as soon as
possible, and inflate them to the proper pressure. Driving
on a significantly under-inflated tire causes the tire to
overheat and can lead to tire failure. Under-inflation also
reduces fuel efficiency and tire tread life, and may affect
the vehicle’s handling and stopping ability.
Please note that the TPMS is not a substitute for proper
tire maintenance, and it is the driver’s responsibility to
maintain correct tire pressure, even if under-inflation has
not reached the level to trigger illumination of the TPMS
low tire pressure telltale.
Your vehicle has also been equipped with a TPMS
malfunction strategy to indicate when the system is not
operating properly. When the system detects a malfunc-
tion, the low tire pressure telltale will flash for approxi-
mately one minute and then remain continuously illumi-
nated. This sequence will continue upon subsequent
vehicle start-ups as long as the malfunction exists. When
the low tire pressure telltale is illuminated, the system
may not be able to detect or signal low tire pressure as
intended. TPMS malfunctions may occur for a variety of
reasons, including the installation of replacement or
alternate tires or wheels on the vehicle that prevent the
TPMS from functioning properly. Always check the
TPMS telltale after replacing one or more tires or wheels
on your vehicle, to ensure that the replacement or alter-
nate tires and wheels allow the TPMS to continue to
function properly.
24 UNDERSTANDING YOUR INSTRUMENT PANEL