If a customer with a 2005 or later DaimlerChrysler vehicle equipped with Tire Pressure
Monitoring (TPM) is concerned that the TPM lamp is on continuously, please be sure to
inform the customer that the system is in place to warn of a low tire pressure situation, and
a system diagnosis may not be required. The customer should be aware of the
• The Tire Pressure Monitoring (TPM) System will warn the driver of a low tire
pressure based on the vehicle recommended cold placard pressure (the placard is
located on the drivers side B-pillar).
• The tire pressure will vary with temperature by about 6.9 kPa (1 psi) for every
6.5°C (12°F). This means that when the outside temperature decreases, the tire
pressure will decrease - the customer should adjust his tire pressure for this
decrease in pressure - please refer the customer to his vehicle owner’s manual for
information on how to properly inflate his vehicle’s tires. The tire pressure will also
increase as the vehicle is driven - this is normal and there should be no adjustment
for this increased pressure.
• The TPM System will warn the driver of a low tire pressure if the tire pressure falls
below the low pressure warning threshold for any reason, including low temperature
• The TPM System 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
recommended cold placard pressure. Once the low tire pressure warning has been
illuminated, the tire pressure must be increased to the recommended cold placard
pressure in order for the TPM warning lamp to be turned off. The system will
automatically update and the TPM warning lamp will extinguish once the updated
tire pressures have been received. The vehicle may need to be driven for up to 10
minutes above 25 kph (15 mph) to receive this information.
A 2006 300 has a recommended cold (parked for more than 3 hours) placard of 207 kPa
If the ambient temperature is 18°C (65°F) and the measured tire pressure is 186 kPa (27
psi) the TPM lamp will be OFF.
IF NOTHING IS DONE TO THE AIR PRESSURE IN THE TIRES and the ambient
temperature drops to 20°F (-7°C) while the vehicle is parked, the approximate tire pressure
will be 157 kPa (23 psi) and the TPM lamp will be ON.
IF THE VEHICLE IS DRIVEN TO REACH NORMAL OPERATING TEMPERATURE
WITHOUT ADJUSTING THE AIR PRESSURE and the ambient temperature stays at -7°C
(20°F), the approximate tire pressure will rise to 186 kPa (27 psi) and the TPM lamp will be
To turn the TPM lamp OFF the tires must be inflated to the vehicle recommended
cold placard pressure.
• In order to properly maintain vehicle tire pressure, please refer to the owner’s
manual for additional information regarding tire inflation.
NOTE: Tire pressure should always be set based on cold inflation tire pressure
(defined as the tire pressure after a vehicle has not been driven for more than
3 hours - and in outside ambient temperature).
• Seasonal temperature changes will affect tire pressure, and the TPM system will
monitor the actual tire pressure in the tire.
If a diagnosis of the system is required (for example, the lamp did not extinguish, or the
lamp is flashing), diagnosis is required.