If the tyre pressure is too low then a warning lamp () illuminates in the combined instrument panel and one of the following messages is shown:
- Tyre pressure low Check front right tyre
- Tyre pressure low Check front left tyre
- Tyre pressure low Check rear right tyre
- Tyre pressure low Check rear left tyre
- Tyre pressure low Check tyres
- Tyre pressure system Service required
The system does not replace normal tyre maintenance.
In order for TM to work correctly, a reference value for the tyre pressure must be determined. This must be performed each time the tyres are changed or the tyre pressure is changed.
TM is then recalibrated and the new reference value applies until steps 1-5 are carried out again.
- After a tyre has been inflated, always refit the dust cap in order to avoid damage to the valve from gravel, dirt, etc.
- Only use plastic dust caps. Metal dust caps can rust and become difficult to unscrew.
System and tyre status
The status is colour-coded for each tyre in accordance with the following:
- All-green: the system is operating normally and the tyre pressure in all tyres is slightly above the recommended level.
- Yellow wheel: corresponding tyre's pressure is too low.
- All wheels yellow: two or more tyres have pressure that is too low.
- All wheels grey: the system is temporarily unavailable. It may be necessary to drive the car for a few minutes at a speed above 30 km/h before the system becomes active again.
- All wheels grey and the message Tyre pressure system Service required: an error has occurred in the system. Contact a Volvo dealer or workshop.
Clearing warning messages
If a tyre pressure message has been shown and the TM warning lamp has been illuminated:
- The TM system uses a so-called compensated pressure value, based on both tyre temperature and ambient temperature. This means that the tyre pressure may differ slightly from the recommended pressures listed on the tyre pressure label on the driver's side door pillar (between front and rear doors). For this reason, it may be necessary to inflate the tyres to a slightly higher pressure in order to clear a low tyre pressure message.
- To avoid incorrect tyre pressure, the pressure should be checked on cold tyres. "Cold tyres" means the tyres are the same temperature as the ambient temperature (approx. 3 hours after the car has been driven). After a few kilometres of driving, the tyres warm up and the pressure increases.
- Incorrect tyre pressure may lead to tyre failure, which could result in the driver losing control of the car.
- The system cannot indicate sudden tyre damage in advance.