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First, have you checked if your brakelights are working ? If not, it could be as simple as the brake light switch,
cruise control is also affected when this switch is defective...

P0455 and P0456 are generic EVAP codes but usually P0456 code is caused by an incorrect or faulty gas cap.
Filling the fuel tank with the engine running could conceivable cause this code as well or if the cap wasn't properly tightened.
I'd check the gas cap, had the same problem and a new cap was the answer…

If not, you could have a small leak in any of the EVAP hoses or fuel tank hoses,
a small leak in the purge valve/vent valve or the EVAP canister itself could be leaking…

Good luck and keep us posted !
 
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