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Several threads about this. Here's one:
www.pacificaforums.com

2018 Blown Head Gasket
I recently took my 2018 Pacifica Limited with just under 66k miles to dealership for a check engine light code p0303 (cylinder 3 misfire). The car would idle roughly. clearly distinguishable. No other OBDII codes. No overheating or coolant issues. The dealership mechanic diagnosed and...