Tyre pressure reading in cold weather

[Jeff43]

When I put the car into Ready mode last week the low pressure warning was showing (several consecutive mornings). The monitor showed two different tyres on different days (sometimes one, sometimes both).  The lights went out after a few miles; when I checked, the pressures were correct.  Is this behaviour normal in freezing weather -  does the pressure really drop overnight?  I know it goes up with warm/hot tyres, so I suppose it's logical.

[forkingabout]

A drop of around 3 PSI is enough to trigger the warning light.

The tyre pressures should ideally be checked when cold at the start of a journey. 

[Bernard Foy]

16 minutes ago, Jeff43 said:

When I put the car into Ready mode last week the low pressure warning was showing (several consecutive mornings). The monitor showed two different tyres on different days (sometimes one, sometimes both).  The lights went out after a few miles; when I checked, the pressures were correct.  Is this behaviour normal in freezing weather -  does the pressure really drop overnight?  I know it goes up with warm/hot tyres, so I suppose it's logical.

See recent posts re same. 

[dash]

Normal behaviour in cold weather. 

[Mojo1010]

 

 

[Cyker]

This is the downside with all this extra information we get - Ignorance is bliss as the saying goes!  

It's totally normal - Overnight temps can plummet and that means the tyre pressures will also drop; During the cold snap last week mine were down over 5 psi in the early mornings!  

They got pressure back pretty quickly as they warmed back up though. (That's one thing about having lower pressure in the tyres - It allows more flex which heats the tyres up faster and increases pressure, so to an extent it's self-correcting. Too low and the tyre will melt itself before getting to nominal pressure!)

 

 

[Derek.w]

I just suffered TPMS faults 2 rear tyres just ignored it for one journey with it on the car display so I can keep a eye on it.

Next morning inflated all my tyres after that display reset in around 200 yards once speed was over around 18 MPH.