Hi bones2782,
There are a few test that you need to carry out to confirm what is wrong.
DTC P1457: EVAP CONTROL SYSTEM LEAKAGE (EVAP CANISTER SYSTEM)
NOTE: The fuel system is designed to allow specified maximum vacuum and pressure conditions. Do not deviate from the vacuum and pressure tests as indicated in these procedures. Excessive pressure/vacuum would damage the EVAP components or cause eventual fuel tank system failure.
Special Tools Required
Vacuum pump/gauge, 0-30 in. Hg A973X-041-XXXXX
Suitable tester/scanner.
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Saturday, February 14th, 2009 AT 6:38 PM