2020 Chrysler Pacifica: misfire or rough idle

Filed Jun 15, 2026 · Engine · IL

Head gasket is cracked causing cylinder 5 to misfire and burned up coolant in the engine causing the engine to overheat while driving and put safety of driver and passengers in danger while vehicle was traveling at high speeds.

Filed Feb 23, 2026 · Engine · AZ

While driving in suburban traffic vehicle engine began running rough and lost most power with about 58000 mi on the vehicle. Received check engine light and vehicle entered 'limp mode' with Turtle Icon displayed on screen. Brought to dealer and it was diagnosed with a P0304 Cylinder #4 Misfire and leaking head gasket causing coolant contamination to engine oil. Dealer repaired the head gasket under warranty. About 2 months after the head gasket was repair at 60,098 miles while drive on the Interstate the engine began running rough. Check Engine Light came on and then Oil Pressure Light came on. We were able to exit the highway, had the vehicle towed to the same dealer where the head gasket was repaired under warranty. This time the engine was diagnosed with a failed #4 Cylinder connecting rod. Chrysler and Dealer refused to repair or replace the engine even though both leak and failure occurred on same cylinder.

Filed Dec 10, 2024 · Engine, Fuel system · FL

The car was running great, but then I had the check engine light on. When I checked the vehicle with an OBDD2, I got P0303 (misfired cylinder 3). A mechanic expert and I checked the vehicle for a possible blown head gasket, low compression, and defective spark plugs, and all was good. The car is a 2020 Chrysler pacifica and should have problems of this kind

Filed Oct 17, 2024 · Engine · FL

Car started to rock and the engine light came on with a cylinder 3 misfire code (P0303). We replaced the spark plug and coil on cylinder 3 and the issue resolved temporarily. About 48 hours later the rocking and engine light came back on with the same error code. We swapped the spark plug and coil on cylinder 3 for those on cylinder 1. The check engine light turned off but we would still get the rocking intermittently. We also noticed the coolant level was low and there are water vapor coming from the exhaust in the morning when starting the engine. The engine temperature never got hot that we noticed. We refilled the coolant level but it would slowly drop, and we felt there may be a leak or, with the cylinder 3 misfire, there may be a blown head gasket. We tried a K-seal coolant leak repair. This stopped the coolant leak and rocking for a few weeks, but the leak and engine rocking started to return. We took it to an auto-body shop and, after flushing the line, they checked the engine head gasket which had a leak on cylinder 3 (and apparently cylinder 1 was also starting to go bad). This had to be replaced along with a bad radiator fan assembly. After looking online, there have been very similar issues with other Pacifica engine head gaskets, so we decided to file a report.

Filed Sep 13, 2023 · Engine, Fuel system · NV

The issue is the Pentastar V6 engine defect. It has caused engine misfires resulting in bucking and surging, decreased engine performance, hesitation, loss of power, premature wear on internal components. The potentially dangerous issues on the “defective design” of the engine’s needle bearings within the rocker arms, the use of sub-standard materials and procedures during manufacture, “defective or miscalibrated” ECM software, and poor quality controls. The Defect causes unsafe driving conditions because the Class Vehicles, that includes 2020 chrysler pacifica, have a significant chance of failing while being driven. Further, even the lesser symptoms of the Defect affect vehicle performance and safety, making it harder for a driver to control the vehicle as it loses power, hesitates, or misfires. the vehicle has only been inspected by the mechanic at the dealership we leased the vehicle from.

Filed Dec 22, 2022 · Engine, Transmission · MN

Severe shaking, or rough idle, when in park or drive but at stop. Chrysler dealership was washed their hands of this issue. I have had it in at least 4 times for rough idle/shaking issue. Has yet to be resolved and is still under warranty.