TPMS Problem

Poulgorm

My car is a Suzuki S-Cross - year is 2023. The car is trouble free - except for one irritant - an almost monthly problem with the TPMS warning system. There are pressure sensors in all 4 wheels.

The recommended pressures are 33 psi (front & rear) with just the driver and 35psi (front) & 41psi (rear), if the car is fully loaded.

The warning symbol can come on if there is a pressure difference of just 1 p.s.i. Currently, it is on, because one of the rear tyres is at 35 psi and the other rear tyre is at 36 psi. It is indicating that the 35 psi tyre is the problem - it says the pressure is too low in that tyre. I am the only person in the car.

I have checked the readings with 2 gauges and the TPMS readings are correct. So, the pressure sensors themselves are not the problem.

Can a Suzuki dealer re-program the system so that it will indicate a problem only if the pressure difference is 3 psi or greater?

Or is there some other fix?

Hellrazer

This is a trick we use with Hondas that give the same issue - the problem is the tolerances are too strict - and even a change in temperature outside can set the system to give a warning ie on a colder morning the air contracts and you get a warning.

Let the tyres down to 5 - 10 psi below recommended - in your case - let some air out until the pressure is 23 - 28 psi.

Then reset the TPMS through the dash board.

Inflate to correct pressure but dont reset through the dash again - you should only then get a warning if the pressure drops more than 5 - 10 psi to what you reset them at - you`ll get a warning at say 18 - 23 psi indicating an actual loss of air.

Poulgorm

I can see the logic of your suggestion. I will certainly try it.

Thank you very much for your expertise - and your willingness to share it.

I will let you know how I got on - this will take about 6 weeks - as this issue has been a monthly problem.

Poulgorm

This morning was dry, so I deflated the tyres to 25 psi. Reset the TPMS through the menu. Drove the car about 200 metres and the TPMS warning symbol switched itself off. Returned home and re-inflated all the tyres to 35psi.

If the issue does not reoccur within 6 weeks, I can take it that the issue is resolved.

Many thanks, Hellrazer.

Hellrazer

https://www.boards.ie/discussion/comment/123830162#Comment_123830162

No problem - it should fix your issues - to be honest I get at least 10 - 20 calls a day about tyre warning lights and the calls always start around September / October - as it starts to get that bit colder.

We were able to confirm that its the colder nights contracting the air in tyres and setting off the TPMS. In my opinion the tolerance is set too low for a climate thats constantly changing like ours.

The fix above resolves about 90% of these calls.

The other 10% is the elderly customers that go to the petrol station on a Sunday morning, pick up their Sunday paper, top up their tyres, water etc and then the light comes on and they arent sure how to reset it - but thats a different thread in itself!!!!

Ive seen 80 psi in a tyre , Ive seen 20 psi in a tyre all because they either keep inflating or deflating it in order to get the light off - and they still call me on a Monday morning!!!