Question

I have a 2010 Dodge Charger 3.5L with engine code P0456, do I have to fix it immediately?

Answer 1

It always good to  repair immediately, P0456 is evap system small leak ,the place to look is the seal of the fuel cap.  Dodge has a TSB out for this code it may pertain you Here a partial copy for the P0456

NUMBER: 18-008-10 REV. A

GROUP: Vehicle Performance

DATE: May 19, 2010

THIS BULLETIN SUPERSEDES SERVICE BULLETIN 18-008-10, DATED MARCH 27, 2010, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE THE ADDITION OF SOFTWARE FOR NAA EMISSIONS.

THE wiTECH DIAGNOSTIC APPLICATION IS THE PREFERRED METHOD FOR FLASHING ECUs. HELP USING THE wiTECH DIAGNOSTIC APPLICATION FOR FLASHING AN ECU IS AVAILABLE BY SELECTING "HELP" THEN "HELP CONTENTS" AT THE TOP OF THE wiTECH DIAGNOSTIC APPLICATION WINDOW.

THE wiTECH SOFTWARE LEVEL MUST BE AT RELEASE 10.03 OR HIGHER TO PERFORM THIS PROCEDURE.

StarMOBILE DESKTOP CLIENT MAY ALSO BE USED TO PERFORM THIS PROCEDURE.

SUBJECT:
Flash: MIL Illumination Or Failed/Rejected At State I/M Test Station Per Symptom/Conditions

OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.

Answer 2

P0456 Dodge Code - EVAP System Small Leak
Read more: https://www.autocodes.com/p0456_dodge.html