Three problems related to engine noise have been reported for the 2018 Chrysler Pacifica Hybrid. The most recently reported issues are listed below.
Metallic buzzing / vibration during moderate acceleration. Occurs occasionally around 30 to 35 mph but also at higher speeds. Vehicle has been at dealership multiple times where the belly heat shield was replaced, rocks were removed from the heat shield, undercarriage was inspected and parts secured, and most recently the entire transmission was replaced. All of the work has been performed under warranty as the vehicle only just passed 20,000 miles. Even after the transmission was replaced the buzzing sound continues as before resulting in another trip to the dealer. There have been no issues with the operation of the vehicle yet but I am concerned that the buzzing / vibration is indicative of a future issue that would render the vehicle inoperable.
I took my van in for recall and was fixed on 7/16/18 for cruise control problem. Everyday since the fan comes on while parked in the garage and charging (level 2) at a very high noise level. Roller coaster type noise. You can hear it all over the house. Car sounds like it is going to explode. Never happened before the recall fix for cruise control. Videos of same type of problem are on the facebook group for this car. Search for "Chrysler pacifica plug-in hybrid". I also videotaped the car making the noise but won't be able to upload such a large file.
I purchased the 2018 Chrysler Pacifica Hybrid in December 2018. In February 2018 at about 3500 miles, the vehicle's engine light turned on and the engine sounded loud. I took the vehicle to the dealership and was informed that a pin was missing from the exhaust camshaft phaser. The pin was not installed with the manufacture of the vehicle according to the technician. The exhaust camshaft was replaced along with a camshaft phaser, oil control solenoid, and cylinder head cover gasket. Subsequently, the transmission failed and was replaced at about 6500 miles in June 2018. The vehicle is now in the repair shop awaiting diagnosis of another issue. I am not an expert in engines. I am concerned that my vehicle may not be the only vehicle manufactured without the camshaft pin. Again, I am not an expert, but I am concerned that the missing pin may result in inopportune engine failure that could result in endangerment of occupants of any faultily manufactured vehicles.