From the forum I note that the cracking of the TPMS valve stem is a common occurrence. I note comments from England, USA an Australia. I'm in South Africa and it is no surprise that this problem exists here. Unfortunately after correspondence with the local dealership as well as the Technical warranty department in SA, Chrysler / Dodge SA refuse to replace, what appears to be an inherent defect, under warranty. What I find amusing is that these cracked valves are replaced under warranty in other countries but not so in SA!! In SA the replacement part is approx R1100.