Hey. I've got an 03 ram hemi qc 2wd. I have been getting P0441 and P0456 codes for a few weeks now. I have tried resetting the PCM twice just to make sure they would come back. I have taken it to the dealership when I just had the p0441 code. They suggested it was the Leak Detection Pump in the EVAP system. I am just clueless as the the p0456 code is. I have replaced the gas cap to a locking gas cap after the codes appeared and no change. I have glanced over the lines directly connected to the EVAP canister, but i cant see any cracks... not say that there definitely are none. Thanks for any and all help.

 

They haven't replaced the Leak Detection Pump yet. Waiting on it to get off back-order.

 

I've got the same P0441, Haynes shows "EVAP system purge system performance"