Low pressure tyre warning

[Ian Key]

I put 38 psi in my tyres measured with an accurate pressure gauge, not the one on the tyre inflater as they usually a couple of psi out and garage pressure gauges are usually way out due to the amount of abuse they get.
In short get an accurate pressure gauge and inflate your tyres to 38psi.

 

[Rolfe]

Was that a front or rear tyre?

Front. Does it matter?

 

[fnegroni]

Front. Does it matter?

Yep.
Front and rear have different thresholds

 

[tsedge]

Given the lower temperatures I have taken to inflating the tyres to 2.7 bar, letting my automatic inflator rest and top up before disconnecting, I find that's actually around 2.65 once they've settled and this stops me getting the low pressure warnings too often.

 

[Pigeon]

In short get an accurate pressure gauge and inflate your tyres to 38psi.

Some cars can be very sensitive and trigger warnings when the weather/temperature changes...my Tucson was particularly grumpy!

I top up in the morning before any driving...if they're being particularly grumpy I'll slightly over inflate in the morning and then leave them for a few hours before adjusting with a decent gauge.

Ambient temperature (and tyre temperature) can play a part so best to let everything settle down before adjusting.

 

[Rolfe]

Yep.
Front and rear have different thresholds

Thanks.

 

[Kithmo]

I'd just pump them all up to 2.55bar first thing on a cold morning. Check pressures again using your pump / gauge to be doubly sure and then drive a few miles. The TPMS should then start to recognise the slightly higher and correct pressures and the warnings disappear for good (or until even colder weather hits you !)

I set mine to 2.55 bar at 8 deg C ambient temperature last week when I'd had a warning, the TPMS was showing 2.5. The TPMS was showing 2.4 this morning at 1 deg C and the warning came back on the left rear even though all the tyres were showing the same 2.4. When I checked them they were actually still at 2.55 bar, except the rear left which was at 2.50, which means the TPMS should not have indicated a low pressure when the correct pressure is 2.5.
Accepting that my cheap Chinese tyre pressure pump gauge may be out, I've now pumped them all up to 2.7 bar and we'll see what happens now.

 

[Leebeejeebee]

Mine's been doing that the last couple of days, but it seems to be only in the morning when the weather is very cold. Later on, when it's a little bit warmer the message doesn't appear.

 

[Lovemyev]

After receiving a TPMS warning light on our Trophy LR on one tyre about six months ago, as I continued on my journey, it triggered another tyre until it triggered ALL tyres !.
When I got home I checked the pressures and in the first warning given, the tyre was about 3 - 4 PSI down on the recommended pressure.
The remaining tyres where very close to the recommend 2.7 Bar.
I re-inflated all four tyres to recommend pressures and the TPMS light went out.
Also I have verified these settings with TWO quality pressure gauges and they report the identical settings.
Over the last six months, I have checked the tyre pressures on the MG App and noticed that the results tend to shift around a little.
Very rarely do they all report the same reading due to ambient temp etc.
To-date, I have not received any further TPMS warnings.

 

[Rolfe]

It's absolute brass monkeys here, and I haven't had any more warnings. Tyres reading 2.5 or 2.4.

 

[STJ73]

I've got a pressure warning but it's not low so can you re set the sensors? Thanks in advance

It was still on the next morning and was on the way to the garage and it went off! Very strange indeed x It must have been the way I was drifting it the day before haha

 

[fnegroni]

I expect most of you this morning will have the warnings clear.
As it happens whenever the ambient temperature goes up - if you had slightly under inflated tyres at the back in particular you might have gained 1 psi this morning.
And you might also had a bit of sun rays shining on to one or two of your tyres so maybe you now have 2 psi more…

 

[Rolfe]

It was still on the next morning and was on the way to the garage and it went off! Very strange indeed x It must have been the way I was drifting it the day before haha

It takes about half a mile for the car to catch on once you've inflated the tyres. The display won't change immediately. Also, if you drove far enough for the tyres to warm, the pressure would come up. If a tyre is so low that it's throwing intermittent warnings it needs a bit more air so that normal fluctuations don't bring it down under the cut-off.

 

[STJ73]

The car is booked in on Tuesday as the pressure sensor is going tits up saying 2.4bar then 1.6bar then 2.3bar!! The thing has a mind of its own lol

 

[ok86]

The cold weather seems to be flagging abnormal tyre pressure. I pumped them up this morning and made a video to help anyone struggling with this. Seems ok now.

 

[Mannakin]

I've just had my right rear warning go off. Definitely down to the ambient temperatures I'm sure. Interestingly my tyres were all just over 30 psi, got it that way from the garage a couple of months ago and confess that I never checked myself. All at 36 psi now. Hopefully my miles per kWh might improve!

 

[DarxKull]

Thanks a lot chaps, that fixed it. There was no sign that any of the tyres had lost pressure, including the one the alert had flagged up. My foot pump actually has psi and BAR dual scales. I thought I'd brought all the tyres up to 2.5 which seems to be 38, but they're still reading 2.4 and 2.5 on the dashboard just as before. Still, they're cold.

I drove about a mile, and all the warnings cleared. This is far easier than the Golf, which wouldn't clear the warnings until you'd paid homage to it by performing the appropriate jujitsu.

I intend to ask the local garage to supply and fit new tyres appropriate to an upland Scottish winter in a couple of months, and after that it won't be quite so embarrassing if I have to ask them to check the pressures. But the foot pump (which I actually bought for my bicycle) seems to do the job fine.

I always worry about the air that seems to be lost when you disconnect the pump. How do people manage that, to know that your tyre is still at the pressure you pumped it to once you've pulled the valve connector off?

I had a warning yesterday, yet the offending tyre was 2.4 apparently. After much arsing about, involving having to close the boot and the drivers door with the window open to connect the pump to the 12v so that I could read the pressure values from the dash, I came to a conclusion. I don't think the display will read more than 2.5/2.4 bar. It will read less, just not go over. Reason being, I switched the pump on and monitored the pressures and alert. Whilst the alert extinguished at what the pump displayed as 2.6 bar, the indicated pressure on the dash did not increase. I left the pump on until it reached 2.8 bar and still the dash showed 2.4 bar. I appreciate that that pump display is for indication only but I did increase the tyre pressure by at least 0.4 bar. I then switched off the car and back on and it still indicated 2.4 bar. A quick check on the app 30 mins later and still, 2.4 bar. I don't have a tyre pressure gauge with me but for sure, something is a miss.

 

[WonkoTheSaneUK]

I had a warning yesterday, yet the offending tyre was 2.4 apparently. After much arsing about, involving having to close the boot and the drivers door with the window open to connect the pump to the 12v so that I could read the pressure values from the dash, I came to a conclusion. I don't think the display will read more than 2.5/2.4 bar. It will read less, just not go over. Reason being, I switched the pump on and monitored the pressures and alert. Whilst the alert extinguished at what the pump displayed as 2.6 bar, the indicated pressure on the dash did not increase. I left the pump on until it reached 2.8 bar and still the dash showed 2.4 bar. I appreciate that that pump display is for indication only but I did increase the tyre pressure by at least 0.4 bar. I then switched off the car and back on and it still indicated 2.4 bar. A quick check on the app 30 mins later and still, 2.4 bar. I don't have a tyre pressure gauge with me but for sure, something is a miss.

The readings will only update after you've driven for roughly 5 minutes.
They won't update if you don't move the car!

 

[DarxKull]

Oh i see. This makes sense as this morning, the app is claiming 2.8.bar.

 

[YaR]

I think my rear left tyre pressure sensor is miscalibrated somehow. It always shows slightly lower than the 3 other tyres, even after I've inflated them all to the same pressure using the same pump. Anyone else have similar?

This is after driving for a few miles, so it's not that the sensor hasn't updated.