"Topping-off" your fuel tank after the fuel pump automatic shut-off will cause a P1457 code (EVAP leak or problem in the circuit at the canister end of the van). My advice is to not do this if you are. Second, make sure the fuel cap is turned at least a good 3 clicks after fuelling. Failure to do this can cause a P1456 code (leak in the EVAP system or problem in the circuit at the fuel tank end of the van).
I would suggest you reset the code and see if it comes back to rule out an intermittent problem.
If the P1457 code comes back on:
DTC P1457 EVAP Control System Leakage
1. EVAP Purge Control Solenoid Valve Test
2. EVAP Bypass Solenoid Valve Test
3. EVAP Control Canister Vent Shut Valve Test
4. Cannister System Leak Test
5. Evapolative Emission(EVAP) Two-Way Valve Test
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