RAM Commercial ProMaster 2024, Owner'S Manual, Page: 166 / 284

TIRE PRESSURE MONITORING
SYSTEM (TPMS)
The Tire Pressure Monitoring System (TPMS) will warn
the driver of a low tire pressure based on the vehicle
recommended cold placard pressure.
The tire pressure will vary with temperature by about
1 psi (7 kPa) for every 12°F (6.5°C). This means that
when the outside temperature decreases, the tire pres-
sure will decrease. Tire pressure should always be set
based on cold inflation tire pressure. This is defined as
the tire pressure after the vehicle has not been driven
for at least three hours, or driven less than 1 mile
(1.6 km) after a three hour period. The cold tire infla-
tion pressure must not exceed the maximum inflation
pressure molded into the tire sidewall. The tire pressure
will also increase as the vehicle is driven — this is nor-
mal and there should be no adjustment for this
increased pressure.
See page 244 on how to properly inflate the vehi-
cle’s tires.
The TPMS will warn the driver of a low tire pressure if
the tire pressure falls below the low-pressure warning
limit for any reason, including low temperature effects
and natural pressure loss through the tire.
The TPMS will continue to warn the driver of low tire
pressure as long as the condition exists, and will not
turn off until the tire pressure is at or above the recom-
mended cold placard pressure. Once the low tire pres-
sure warning (TPMS Warning Light) illuminates, you
must increase the tire pressure to the recommended
cold placard pressure in order for the TPMS Warning
Light to turn off. The system will automatically update
and the TPMS Warning Light will turn off once the sys-
tem receives the updated tire pressures. The vehicle
may need to be driven for up to 20 minutes above
15 mph (24 km/h) in order for the TPMS to receive this
information.
NOTE:
When filling warm tires, the tire pressure may need to
be increased up to an additional 4 psi (28 kPa) above
the recommended cold placard pressure in order to
turn the TPMS Warning Light off.
For example, your vehicle may have a recommended
cold (parked for more than three hours) placard pres-
sure of 30 psi (207 kPa). If the ambient temperature is
68°F (20°C) and the measured tire pressure is 27 psi
(186 kPa), a temperature drop to 20°F (-7°C) will
decrease the tire pressure to approximately 23 psi
(158 kPa). This tire pressure is sufficiently low enough
to turn on the TPMS Warning Light. Driving the vehicle
may cause the tire pressure to rise to approximately
27 psi (186 kPa), but the TPMS Warning Light will still
be on. In this situation, the TPMS Warning Light will turn
off only after the tires are inflated to the vehicle’s rec-
ommended cold placard pressure value.
CAUTION!
•
The TPMS has been optimized for the original
equipment tires and wheels. TPMS pressures and
warning have been established for the tire size
equipped on your vehicle. Undesirable system
operation or sensor damage may result when
using replacement equipment that is not of the
same size, type, and/or style. Aftermarket wheels
can cause sensor damage.
(Continued)
CAUTION!
•
Using aftermarket tire sealants may cause the Tire
Pressure Monitoring System (TPMS) sensor to
become inoperable. After using an aftermarket tire
sealant it is recommended that you take your
vehicle to an authorized dealership to have your
sensor function checked.
•
After inspecting or adjusting the tire pressure
always reinstall the valve stem cap. This will pre-
vent moisture and dirt from entering the valve
stem, which could damage the TPMS sensor.
NOTE:
•
The TPMS is not intended to replace normal tire
care and maintenance or to provide warning of a tire
failure or condition.
•
The TPMS should not be used as a tire pressure
gauge while adjusting your tire pressure.
•
Driving on a significantly underinflated tire causes
the tire to overheat and can lead to tire failure.
Underinflation also reduces fuel efficiency and tire
tread life, and may affect the vehicle’s handling and
stopping ability.
•
The TPMS is not a substitute for proper tire mainte-
nance, and it is the driver’s responsibility to main-
tain correct tire pressure using an accurate tire
pressure gauge, even if underinflation has not
reached the level to trigger illumination of the TPMS
Warning Light.
•
Seasonal temperature changes will affect tire pres-
sure, and the TPMS will monitor the actual tire pres-
sure in the tire
page 269.
164 SAFETY