Dodge 2012 Ram Truck Gas 1500 Owner's Manual page 523

STARTING AND OPERATING 521
turn off. 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.
Service TPMS Warning
If a system fault is detected, the TPM Telltale Light will
flash on and off for 75 seconds and then remain on solid.
The system fault will also sound a chime. In addition, the
EVIC will display a "SERVICE TPM SYSTEM" message
for five seconds and then display dashes (- -) in place of
5
the pressure value to indicate which sensor is not being
received.