Here are Chrysler Pacifica engine problems, by model year. The most common Pacifica engine problems cost $2,200 to fix & occur at 123,000 miles. Regarding the worst model year 2005 Chrysler Pacifica engine problems, "Engine cradle rot is a serious problem in the 2004-05 Chrysler Pacifica. Chrysler admits they didn't apply enough coating to the vehicle's sub-frame during assembly, but only offered to cover a very small portion of the vehicles they messed up." Click on a year below.