NHTSA Complaint #11689900 — 2018 CHRYSLER PACIFICA

Blown Head Gasket (Cylinder 3 Misfire) After having 2018 Chrysler Pacifica Touring L serviced at Chrysler Dealership, technicians found small leak coming from Oil/Coolant Filter housing unit. Part was replaced and few days later vehicle had a misfire and had flashing Check Engine Light (CEL). Car was towed to dealership, technicians said code seen was P0303 (Cylinder 3 Misfire). Tech, replaced Ignition coil for cylinder 3 and cleared codes. Two days later on start up, P0303 (cylinder 3 misfire) came back with CEL. Tech cleared codes and could not re-create CEL again. Two days later P0303 came back. Technicians performed more diagnostics and confirmed blown head gasket. This seems to be a very prominent issue with 2017-2018 Pacificas, more notably Cylinders 1, 3, & 5. The catalytic converter sits above the firewall cylinder bank and possibly is causing this possible engine failure due to excessive heat and poor heat dissipation capability over time. If not caught quickly, coolant can leak into cylinder affected and then overheat engine causing irreversible damage. This situation can also create a very hazardous situation if driving into speeding traffic from a turn and engine misfires, my vehicle could be rear ended if acceleration does not happen quickly enough.