Brought Pacifica into the dealer because of ‘check engine’ light. Car had some shaking too upon startup. There was also some ‘ticking’ sounds in the dashboard. Dealership told me that the head gasket of the first (and likely third) needed to be replaced. There was an engine 3 misfire per diagnostics. I was quoted at $4,600 for the repair. This appears to be a known issue, as the dealer said ‘we don’t know if this will turn into a recall.’ There seems to significantly similar issues all over the Pacifica message boards.