Tyre pressure monitoring system error

[yeoman]

My left rear tyre keeps coming up with a low pressure warning.
I have checked and recheck the tyre pressure at 2 different centres.

Having made sure the pressure was correctly set to 2.6, I have tried to calibrate as per the instruction, and after the calibration,I am still getting he low tyre pressure warning ,and It reports the pressure in the tyre as approximately 2.0 .

Anyone else had his experience?

[Deman77]

Is yours early model with the TPMS device or later model with rotation based calculation?

[familymangreg]

Originally Posted by Deman77

Is yours early model with the TPMS device or later model with rotation based calculation?

I'm assuming that as the OP is getting an actual reading of about 2.0 for the tyre, it must be the active TPMS rather than the passive TPMS which doesn't report actual pressures, but rather simply that there is a difference in pressure from that originally calibrated.

So, my guess is a faulty sensor on that wheel.

:wq

[Lexman8]

If it's reporting an actual pressure it must be one of the earlier TPMS ones. It sounds like a dodgy sensor.

The tyre valve has a pressure sensor in it which is linked to a small box behind which contains a battery and electronics to convert the pressure into a electrical value (digital I assume) which is then fed into a transmitter (inside the box inside the tyre) and picked up by a receiver in the car. The box of electronics lives in a harsh environment and is spun round at the rotational speed of the tyre. As a consequence, they do fail and can cost between £50 and £100 to replace. Also, the battery lasts about 5 years and cannot be replaced; you have to buy a whole new unit.

I was glad Volvo switched to the iTPMS system. Less to go wrong and much easier to change to and from winter tyres.

[gaby]

I am not happy with iTPMS, it's a serious downgrade. I would have prefered that dTPMS would have been
an option so owners could choose if they wanted to pay the price.
I don't know about the Volvo sensors, but the battery of a BMW motorcycle can be replaced, although
it takes some digging and resealing of the electronics.

[Clan]

Originally Posted by gaby

I am not happy with iTPMS, it's a serious downgrade. I would have prefered that dTPMS would have been
an option so owners could choose if they wanted to pay the price.
I don't know about the Volvo sensors, but the battery of a BMW motorcycle can be replaced, although
it takes some digging and resealing of the electronics.

It is law , all cars have to have these ... But they are being seriously abused though . a light comes on and people re- calibrate at the lower pressure whilst sat in their warm cosy car just to put the light out . The majority of drivers are just too lazy to get out and pump the tyres up . So we still have volvos and other makes running around with tyres worn through to the cords going around at 90 mph in the wet . no wonder we have daily accidents on all the motorways . ... So much for that law . It could easily be avoided with some clever software that would not allow calibration until the readouts were a certain amount higher than before calibration was attempted .

[yeoman]

Originally Posted by Deman77

Is yours early model with the TPMS device or later model with rotation based calculation?

Mine is a 2016 T8, so probably the older monitor.It certainly sounds like a sensor error.

[gaby]

Originally Posted by Clan

It is law , all cars have to have these ... But they are being seriously abused though . a light comes on and people re- calibrate at the lower pressure whilst sat in their warm cosy car just to put the light out . The majority of drivers are just too lazy to get out and pump the tyres up . So we still have volvos and other makes running around with tyres worn through to the cords going around at 90 mph in the wet . no wonder we have daily accidents on all the motorways . ... So much for that law . It could easily be avoided with some clever software that would not allow calibration until the readouts were a certain amount higher than before calibration was attempted .

My reply must have been unclear. It happens, English is not my native language
What I meant to say is that I don't mind that iTPMS is standard, I know cars must have some kind
of tyre pressure monitoring system. But I would like dTPMS available as an option.
I would be willing to pay for it. Unfortunately our car has iTPMS...

[nu11eaf]

Originally Posted by Clan

It is law , all cars have to have these ... But they are being seriously abused though . a light comes on and people re- calibrate at the lower pressure whilst sat in their warm cosy car just to put the light out . The majority of drivers are just too lazy to get out and pump the tyres up . So we still have volvos and other makes running around with tyres worn through to the cords going around at 90 mph in the wet . no wonder we have daily accidents on all the motorways . ... So much for that law . It could easily be avoided with some clever software that would not allow calibration until the readouts were a certain amount higher than before calibration was attempted .

I would like to see your evidence to show that the "majority" of drivers are too lazy to act on a safety issue like a low tyre pressure warning. That is a very bold statement. You would have to be totally stupid to ignore this warning and re-calibrate the system and I dont think the majority are totally stupid enough to do that. A few are sadly.

A defective TPMS (if fitted) is now a MOT failure but a low tyre pressure is not as long as the system is working correctly, most new TPMS will have a "system" failure/fault warning light that MOT station will pick up on, (not the normal pressure warning)

[Rooster]

Originally Posted by nu11eaf

I would like to see your evidence to show that the "majority" of drivers are too lazy to act on a safety issue like a low tyre pressure warning. That is a very bold statement. You would have to be totally stupid to ignore this warning and re-calibrate the system and I dont think the majority are totally stupid enough to do that. A few are sadly.

You would be suprised,