TPM can fail under extreme temperature
This is a heads-up to folks here who may not be aware. I'm pretty religious about checking that my tyres have the proper pressure. Yesterday, the outside temperature changed from 46 degrees when I left home for work to 88 degrees when I left work (where I park in an underground garage) to return home; with traffic conditions in the evening, the road surface temperature was probably over 100 degrees. My iDrive registered a TPM system failure when I was a few miles away from home. The car felt normal and I did a visual check of the tyres when I stopped at the next traffic signal; however, I pulled into my neighborhood filling station to do a complete check. [This is one of those "old school" filling station/garages with certified mechanics; it has been in the neighborhood for over 40 years.] A technician checked the tyres to make certain they were not punctured (they weren't) and then checked the pressure. The fronts, which should have been 32 psi, were over 36 psi; the rears were over 40 psi, and should have been 35 psi. I had checked and corrected my tyre pressure not quite 2 weeks before. Apparently, the dramatic temperature change yesterday caused the significant increase in tyre pressure. However, even when the psi was returned to normal yesterday, the TPM would not reset. I was prepared to take the car to the dealer this morning but, as I pulled out of my garage, the TPM system automatically reset - saving me my Saturday morning. So, this is for you folks who live in areas where outside temperatures are warming up. Be certain to check your tyre pressure.
Have a great weekend!
Currently: 2015 Porsche 911 GTS and 2016 Cayenne S eHybrid
Past BMWs: `05 645CiC; `07 650i; `08 M6 convertible; '08 135i; `11 750ix MSport; `15 M235i convertible
"You think that's air you're breathing now?"