That sounds like an EVAP vent solenoid.
EGR would be on the exhaust manifold or attached to the intake.
I looked at Mitchell, Alldata, Mopar, and Identifix and none of them show an EGR valve. And they also do not list P0400 as a valid code for the 4.0 liter six cylinder.
Looking at the emissions devices used it also does not show an EGR.
4.0L (242") SFI CCV, EVAP, TWC, FR, SPK, HO2S, CEC, MIL EVAP-LDP, EVAP-CPCS,
EVAP-VC, SPK-CC EGR testing process - None
Wednesday, August 16th, 2017 AT 12:26 AM