If the symbol first flashes for approximately one minute and then changes to a constant glow, it may indicate that the system cannot detect or warn of low tyre pressure as intended.
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ITPMS measures differences in rotation speed between the different wheels via the ABS system in order to be able to determine whether they have the correct tyre pressure. If the tyre pressure is too low, the tyre's diameter is changed and, as a result, so is its rotation speed. By comparing the tyres with each other the system can determine whether one or more tyres have pressure that is too low.
When the tyre pressure is too low, the indicator symbol for low tyre pressure is illuminated in the display and a message is shown, see also the heading "Message in the driver display" below.
General information on the tyre monitoring system
In the information below, the tyre monitoring system is referred to generically as TPMS.
Each tyre, including the spare tyre*, should be checked once a month. When checking, the tyre should be cold and have the air pressure recommended by the car manufacturer specified on the tyre pressure label or in the tyre pressure table. If the car has tyres of a different size than that recommended by the manufacturer, find out what the correct air pressure level is for these.
As an extra safety feature, the car is equipped with a tyre pressure monitoring system (TPMS), which shows when the air pressure in one or more tyres is too low. When the indicator symbol for low air pressure is lit, stop and check the tyres as soon as possible and inflate to the correct air pressure.
Driving with tyres that have tyre pressure that is too low may cause the tyre to overheat, which can cause a puncture. Low tyre pressure also reduces fuel efficiency as well as tyre service life, and can affect car handling and stopping ability. Note that TPMS does not replace regular tyre maintenance. It is the driver's responsibility to maintain correct tyre pressure, even if the limit for low tyre pressure has not been reached so that the indicator symbol illuminates.
The car is also equipped with a TPMS system fault indicator, which indicates when the system is not functioning correctly. The TPMS system fault indicator is combined with the indicator symbol for low tyre pressure. When the system detects a fault, the symbol in the driver display will flash for about one minute and then remain illuminated. This procedure will be repeated when the car is started until the fault has been rectified. When the symbol is illuminated, the system's ability to detect or warn of low tyre pressure may be affected.
A TPMS system fault can occur for several reasons, such as after changing to a spare tyre, or changing tyres or wheels that prevent TPMS from functioning correctly.
Always check the indicator symbol for TPMS after changing one or more tyres in order to ensure the new tyre or wheel is working correctly with TPMS.
Messages in the driver display
The following messages may be shown when the indicator symbol is illuminated:
- Tyre pressure low Check tyres, calibrate after fill
- Tyre pressure system Temporarily unavailable
- Tyre pressure system Service required.
If the system cannot determine which tyre has low pressure, all four tyres will be indicated in the centre display.
To bear in mind
- Always calibrate the system after a wheel change or tyre pressure adjustment. See the tyre pressure label on the driver's side door pillar for Volvo's recommended tyre pressures.
- The system does not replace normal tyre maintenance.
- There is no option to deactivate ITPMS.