NHTSA Complaint #11622063 — 2017 CHRYSLER PACIFICA

2017 Chrysler Pacifica Touring L with 3.6L engine. Odometer 78623 miles. Noted rough idling of engine for a few seconds when started. Later in day, at low speeds, check engine light came on solidly (no flashing) for a few seconds and then turned off. Early next morning took van to reputable local mechanic who has maintained the vehicle according to Chrysler recommendations. They pulled error code P0305 Cylinder misfire. They removed and inspected spark plug which showed minor deposits. Looked in cylinder with bore scope which showed orange-redish discoloration on piston. Put new spark plug on #5 and swapped coil #5 with coil #3. Coolant was low but no coolant leak was discovered. Van never had an overheating episode. All maintenance was performed according to Chrysler recommended schedule, first by local Chrysler dealership, and then by this same mechanic shop. Diagnosis, warped or fractured cylinder head resulting in coolant leak into cylinder. Pictures were taken by shop and available on request.