Purchased 2011 Grand Sport corvette which now has 1000 miles. I was surprised to get a warning from On-Star that one of my tires was under inflated by 9 psi (should be 30 and measured 21psi). If the system is reporting this via on star how come it did not give me a warning on the dash. When I received the e-mail, sure enough the pressure was down by 9 psi and still no indication of a problem on the TPMS light. Does anyone know waht the threshold level is before it reports a problem in real time to the driver. Could this also be an indication that there is something wrong with the internals since I have had 4 check engine light warnings (PO442 code which is emissions) in which dealership can not locate the problem.
Checked with a local reputable Chevrolet dealership in Phoenix instead of the inept one in Scottsdale. They took the time to inform me that the C6 corvette with the run flat tires will not activate the Tire Pressure Monitor System dash board light until the pressure drops tp 6 psi from the recommended 30 PSI. In light of the aforementioned, it would be wise to check tire pressure readings with the on-board system which is extremely accurate. Not sure why they set the threshold so low. Want to thank Dad for is inputs regarding Check Engine Light. Chevrolet refuses to take it to a higher level to resolve problem so I will try a different dealership which has trained Corvette mechanics on staff. As a backup, I purchased a On Board Diagnostic Sytem to monitor this problem if they can't resolve this issue. I figure the item failing will eventually permanently fail and allow any dealership to resolve problem. The lesson I learned from these incidents is that the Chevrolet technical support is worthless. I think my dog knows more about cars than these service technicians who's only concern in the morning is what tie to ware.
