FILLER CAP KEEPS MAKING A LIGHT ON DASH LIGHT

[AIRLORDD]

Ok, 5 days and counting. no lights, no check engine lights, no codes, no nothing. truck runs fine everything is as it should be. I guess that does it. new MOPAR gas cap, new purge valve, new evap valve and 1 hour with the negative battery lead off.

 

[Dodge 1500 4X4]

new MOPAR gas cap, new purge valve, new evap valve

Is the evap valve what you replaced? it's called the ESIM module, mounted on the tank.