It is called MTBF. Hence the reason why GM offers a 3yr/36,000 mile warranty. If GM produced a quality product, their warranty would be considerably longer. The GM actuaries determined a few years back their 5yr/60,000 mile warranty was reducing profitability due to vehicle components failing before the warranty period expired. So, GM in true fashion simply reduced their warranty period.
In addition to offering a reduced warranty, GM has also patented the "cannot duplicate", "functioning as intended", and "the ECM did not record any trouble codes, therefore your problem doesn't exist".