2017 Chrysler Pacifica: misfire or rough idle

Filed Sep 10, 2026 · Engine · AZ

One year ago (114k miles) I started having some rough idle, stumbling, etc. Then a cylinder 5 misfire code appeared. I swapped around coils and injectors, replaced the PCV valve, replaced lower intake manifold, coolant flush. Still no improvement. So I then replaced all the coils, plugs, and bench cleaned and tested all of the fuel injectors and reinstalled them with new o-rings. Misfire code kept returning. On Veteran's Day last year on our way back from a parade it would barely go over 35 mph with the CEL flashing. I limped it straight to the dealership. For context, I have never run the vehicle hot and have kept up on regular maintenance intervals. I gave them a detailed list of everything I did to the vehicle. They had it in the shop and did a compression test. Compression was good on the cylinder head for 1, 3, and 5. However, a leak down test was performed and showed a significant leak in cylinder 5, prompting the need to replace that cylinder head. Luckily, we still had our extended warranty and this $10k job was completely covered. Fast forward to a month ago (126k miles) I was getting a noise from the accessory drive area. After looking closer, I had to replace the serpentine belt. In order to do that I had to remove the lower radiator hoses and drain the coolant. Got everything back together and started it up. The noise I previously heard was louder and more like a chatter. Then a cylinder 4 misfire code appeared. I tore it down, looked at the plugs and coils. All checked out. Did a compression test and compression in all 3 cylinders was good at #2: 155 psi, #4: 151 psi, #6: 153 psi. Ibwent ahead and replaced fuel injector for that cylinder. Vehicle has been running for a few weeks and is still registering misfires for cylinder 4. Everything is pointing towards a cylinder head replacement, which will cost upwards of $10k, just as the previous cylinder head replacement did. This is a far too common problem on these engines.

Filed Jun 2, 2026 · Engine · IL

2017 Pacifica, 58,000 miles. Engine light comes on, error code is "00305 Engine misfire on cylinder 5". Replaced sensor and ignition coil and spark plugs, but error keeps coming back. The mechanic found that the head gasket is leaking anti-freeze into the cylinder. Looking online this is a common problem with Pacifica 3.6L engines, many people have had the same problem, there is a defect with the engine I checked for a recall, but there is nothing open for my VIN.

Filed Mar 26, 2026 · Engine · KS

The check engine light is on my Chrysler Pacifica 2017 Limited with error codes P0302 and P0306, indicating misfires in the second and sixth cylinders. The vehicle was purchased brand new in 2017 from a Chrysler dealership in Olathe, Kansas and currently has approximately 97,000 miles. So far, the spark plugs and valve cover gasket have been replaced, but the same error codes persist. The mechanic is now recommending head gasket replacement, with an estimated repair cost of up to $5,000, which is extremely high. After researching this issue online, I found that thousands of Chrysler owners have experienced the same problem, yet no recall or corrective action has been issued by Chrysler. I contacted Chrysler customer support directly, but was informed that no assistance could be provided because the vehicle is out of warranty. We chose to purchase this vehicle based on the trust, reliability, and customer service reputation of Chrysler, but unfortunately, this experience has not reflected those values. An engine failure of this magnitude at this mileage is unacceptable, especially when it appears to be a known and widespread issue. I strongly believe Chrysler should take responsibility and provide assistance for this engine defect.

Filed Jan 4, 2026 · Engine · CA

2017 Chrysler Pacifica at 70k miles, check engine light came on. After engine warm up, engine starts to rough idle. Diagnosis is misfire on cylinder 2 (code P0302). In addition, vehicle voltage fluctuates in gage cluster between 12-14 volts. No issue until engine is warm and no issue above idle or with load. Injectors were checked and fine, coils and leads were replaced. Fix did not work. Took to Chrysler dealership for addition diagnosis. Dealership diagnosis is cylinder head warpage due to overheating. Single owner of vehicle, regularly maintained and with no “low coolant” engine light.

Filed Nov 29, 2025 · Electrical, Steering · CA

My 2017 Chrysler Pacifica Touring-L has suffered repeated and dangerous electrical failures since purchase. Shortly after buying it from AutoNation Chrysler Dodge Jeep RAM in Valencia, CA, I had to return it twice for electrical repairs that kept it in service several weeks under warranty. About two years later, while still under extended warranty, the engine underwent a complete rebuild for multiple-cylinder misfire codes that were likely caused by intermittent CAN-bus voltage loss rather than a mechanical defect. Over the past nine months, the vehicle has again developed severe electrical faults while driving: sudden loss of power steering assist, all dashboard lights illuminating, windshield wipers activating spontaneously, and the engine failing to shut off using the Start/Stop button. The vehicle has also stalled without warning while driving in traffic or idling at red lights, restarting only after 5–10 minutes and blocking traffic lanes, placing me and surrounding drivers at significant risk. Two major repairs in the last two weeks failed to resolve the defects: (1) repair of the CAN-bus system after the vehicle would not start and acted erratically while driving, and a week later (2) replacement of the brake-booster vacuum pump, which was shorted internally and caused CAN-bus shutdown, complete steering loss, sudden braking, and no engine power. The vehicle is currently at Dependable Chrysler Dodge Jeep Ram, Canoga Park, CA, awaiting further diagnosis despite repeated repair attempts. These symptoms match Chrysler TSBs 08-007-17 and 08-033-21 concerning Body Control Module water intrusion and communication faults. This ongoing electrical defect has caused steering loss, random stalling, ignition failure, and unpredictable vehicle behavior—issues widely reported by Pacifica owners. It poses a serious safety hazard and warrants immediate investigation and recall.

Filed Oct 19, 2025 · Electrical, Engine · VA

The van have issues with a head gasket, Chrysler is aware yet the dealers keep selling the van with this known problems, I reached out to Chrysler and they said they cannot help. I had the van less than a year and I had the van serviced multiple times. Im attaching this link to show you guys that there ia a lot of people having the same problem, everything starts with the smell of the coolant then the misfire PO201, po301, then after taking it it was po305 and po205, https://youtu.be/sUfTxNBkRLU?si=JoLL29t6YbHZIiVg they speak on the video how they replaced the apparently bad part then the codes come back. I had this vehicle less than a year and I had so many issues, in my search I found this happening to multiple pacifica owners. vehicle starts misfiring creating a real possibility of having an accident as the car speed had to be reduced, specially if we are on the highway.

Filed Mar 21, 2025 · Engine · MI

Cylinder 5 was misfiring causing driveability problems. If the engine were to fail completely, then the vehicle could become uncontrollable and cause an accident. The manufacturer knows about the problem but has not issued a recall. The vehicle was repaired by the local car dealer. The problem occured around 57000 miles on the odometer. A check engine light did come on.

Filed Mar 20, 2025 · Engine · 74,600 miles · NY

The contact owns a 2017 Chrysler Pacifica. The contact stated that while driving at an undisclosed speed, there was an engine misfire with the check engine warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with a misfire in cylinder #3. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The contact was informed that the vehicle was undrivable. The dealer declined to release the vehicle without repair. The manufacturer was not made aware of the failure. The failure mileage was approximately 74,600.

Filed Mar 15, 2025 · Engine · TN

Engine has a blown head gasket at 80k miles. Number 3 cylinder keeps misfiring due to the engine coolant being injected into the cylinder due to the blown head gasket. Poor engineering with this engine and I’ve read several others have experienced this same issue. Please do a recall for this issue due to the warranty not wanting to cover this!

Filed Mar 5, 2025 · Engine · CA

The check engine light came on. Upon using a code reader, a code for a misfire in cylinder 3 populated. The ignition coil was replaced for cylinder 3. About a month later, the check engine light came back on and all 6 spark plugs were replaced. My vehicle had some rough starts periodically. As time went on, the rough starts turned into serious shaking. The check engine would come on and be gone in a day or so. Every time the code reader read cylinder 3. After months of trying to trouble shoot and do what we could, we took it to a mechanic where they informed us that my vehicle had a blown head gasket. They revealed to us that this is a very common problem with the particular engine, 3.6L Pentastar. This is a problem that they have seen for years in this particular engine. The mechanic had to send part of my engine out to a machine shop to be re-drilled properly in order to fix the issue which was very costly. The safety of my family was put at risk as the gasket blew while we were driving down the freeway unsure if we were going to make it home. My vehicle has not been inspected by anyone other than ourselves, the mechanic and the machine shop.

Filed Feb 18, 2025 · Engine · MA

2017 Chrysler Pacific diagnosed with leaking head gasket at ~65000 miles. Initially diagnosed from a check engine light code for a cylinder misfire. My private mechanic said that he has done 4 of these in the past month (Jan 2025). He said this is a costly repair that should not happen with this low of mileage. In exploring the problem, it appears that it is a known issue.

Filed Jan 17, 2025 · Engine · IA

The oil filter housing and oil cooler unit is made of plastic, mounted to the central engine (metal). It warped with heat and caused oil to leak into the valley of the engine and cause failure of bay 3 and 5 fuel injectors which caused multiple cylinder misfire. My engine experienced this problem for the first time in a busy intersection. With the engine heaving I had to pull over and tow the van to a shop. The faulty oil cooler unit was confirmed by dealership diagnostics and was not covered under warranty. I have the original part. This a recurring problem with many other drivers online and an aluminum aftermarket part has been made to solve this problem. The original part should be recalled and replaced by Chrysler. The EGR hosing is made of brittle plastic and split/cracked of its own accord. I have pictures and most of the original hose.