[TH1984]

Has anyone else had this come on?
Mine has just come on today saying a drop in pressure. I have just been to the petrol station to put air in and the pressure was 38psi front and back. I had been driving but only for maybe 20 minutes.

If there has been a drop, I dread to think what the pressure was beforehand.

 

[Snowdaddy]

These systems can be quite sensitive. There is a relationship between Pressure and temperature

My previous car would occasionally flag it in roughly the same section of road on my commute, eventually I sussed out that one side of the road was shaded and tended to have (cold) puddles so the tyres must have been warming at a different rate. Would have been about 15 minutes into my journey so not that different to what you have.

Never had to add air in 2 years.
Having checked I didn't have a flat, I would then reset the system following morning when every tyre was same temperature.

 

[RJL]

I had the same problem, though we were driving on the M6. We slowed down and stopped and checked the tyre pressures and they were, if anything high. Over the next days the tyre pressure warning symbol remained illuminated until we reset the system.