The P0455 code signals a large leak in the Evaporative Emission Control System (EVAP). This sealed system prevents fuel vapors accumulating in the fuel tank from escaping into the atmosphere. One common culprit is an improperly closed or open gas cap, but other issues could be at play. ...
2001 Dodge Grand Caravan, 3.3L V6 with aprox 97K miles, check engine light is on again for the fourth time in less than 2 months. The first time the codes were 1684 & P0456, we changed the gas cap to a new one and had the codes reset. The second time was 2 days later, the ...