My check engine light came on with the code 0456. What does that mean?

I would not worry about it, it may have corrected itself. If back on take in for repair.

code p 0456 refers to evaporative emission (EVAP) system---very small leak detected===causes --mechanical fault---hose connection/s--EVAP pressure sensor

A loose gas cap will throw a P0456 trouble code so will the gas filler neck.You can take the ground cable off of the battery for 3 minutes to reset the computer but,if that does'nt work you will need a scan tool or a code reader.

evaporative emmissions-----cud be just a soft code then disapear---chec if something was disrupted while reaparing----jags are real complicated with vacuum issues-may be a disconnect which often mimmics

Yea VSC lite will come on when ever a check engine lite is On, the codes you mentioned are certainly a EVAP codes, make sure your gas cap is a factory and inspect seal surface and contac surface on filler neck for rust clean if any,also check all hoses going into air box reconect if necesary, (have your car been in any accident) if have access to a scan tool resest lite if lite comes back no other option take it to a dealer, check for warranty coverage on this systems.
good luck

It's a leak in your evap system. Causes: *Loose or missing fuel cap. *Evap canister broke, hose cracked or not connected. *Purge or vent solenoid defective *Vacuum leak at engine good luck

IF UR CHECK ENGINE LIGHT IS ON THE VEHICLE SHOULD GO ON A CODE READER SOMETIMES A LIGHT CAN COME ON 4 ONE SMALL GLITCH AND MEAN NOTHING GET THE CODE READ BEFORE SPENDING MONEY

Gas cap tight?

• A small leak in any of the EVAP hoses or fuel tank hoses
• A small leak in the purge valve or vent valve
• The EVAP Canister may be leaking.