Check Engine Light P0442

Question

I have a 2008 Buick Enclave and the check engine light came on. We had the canister replaced about a week ago but the light came on again so we took it to Auto Zone and the code P0442 came on. What could it be?

Answer 1

P0442 EVAP system small leak detected

If the fuel cap was already replaced, this leaves you with a popular condition, which is more than likely with the FTP (fuel tank pressure) sensor, where the FTP does not report the proper vacuum or pressure.