The service bulletin 25-002-15 REV. B for the 2015 Jeep Grand Cherokee and Dodge Durango says to replace the purge valve hose if it shows any splits and codes P0455 or P0456 are present. How the EVAP System WorksEVAP System Simplified Diagram The Evaporative System (EVAP) traps the ...
What this code means is that the computer has tested the evap system and was not able to draw a vacuum on the fuel tank. it does this by turning on the evap vent valve which closes the fuel tank vent off, It then opens the vacuum solenoid and allows engine vacuum to be drawn on th...