NHTSA Complaint #11614305 — 2018 CHRYSLER PACIFICA

At just over 100K miles, vehicle had check engine light come on (P303) indicating cylinder #3 mis-fire. After replacing spark plugs did not resolve the issue, further diagnosis from mechanic revealed leaking of coolant into cylinder #3 as the cause of the miss-fire. This is further borne out by the rough starts when cold followed by more smooth operation once the coolant is burned off. Research on-line shows that this failure is common in Chrysler Pacifica rather than a one-off incident. Leaking of coolant into the engine not only puts the engine (and therefore vehicle occupants) at risk but also damages the catalytic converter which can have an impact on the environment.