P0363 on 2017-2024 Chrysler Pacifica 3.6L: Misfire Fueling Disabled Causes and Fixes

What's Unique About the 2017-2024 Chrysler Pacifica

While ignition coils and plugs are common culprits on any vehicle, the 3.6L Pentastar V6 in the Pacifica has a well-documented history of valvetrain issues. A rhythmic ticking noise, often called the 'Pentastar Tick,' is a major red flag for rocker arm and lifter failure. This happens when the needle bearings in the rocker arm seize, causing the roller to stop spinning and wear a groove into the camshaft lobe, which reduces valve lift and causes a misfire. Chrysler issued Technical Service Bulletin (TSB) 09-010-21 for 2021 models to replace all exhaust rocker arms due to misfires, even if no codes were set. This means that while you should check the simple things first, a mechanical engine problem is a more common cause for this code on a Pacifica than on many other vehicles.

Symptoms You May Notice

• Flashing or solid Check Engine Light
• Noticeable engine shaking or vibrating, especially at idle
• Significant loss of engine power and poor acceleration
• Engine may stall or be difficult to start
• A rhythmic metallic 'ticking' sound from the top of the engine, indicative of rocker arm failure.

Most Likely Causes

1. Faulty Ignition Coil 🔴 High Probability → Shop Ignition Coil Coil-on-plug systems are common failure points due to constant heat and vibration. The rear bank of cylinders on the V6 (1, 3, 5, against the firewall) can experience higher temperatures, potentially leading to a shorter lifespan.
   How to confirm: First, identify the misfiring cylinder with a P030x code (e.g., P0302 for cylinder 2). Swap the ignition coil from the misfiring cylinder with one from a known good cylinder (e.g., swap coil from cylinder 2 with cylinder 4). Clear the codes and run the engine. If the misfire code moves to the new cylinder (e.g., P0302 becomes P0304), the coil is bad.
   Typical fix: Replace the failed ignition coil. It is often recommended to replace the corresponding spark plug at the same time.
   Est. part cost: $30-$70 per coil
2. Worn or Fouled Spark Plug 🔴 High Probability → Shop Spark Plug Spark plugs are a regular maintenance item with a finite lifespan. The manufacturer recommends replacement at 100,000 miles, but they can fail earlier. TSB 09-013-20 Rev. A was issued for some 2020-2021 models due to misfires caused by spark plugs with internal manufacturing cracks.
   How to confirm: After identifying the misfiring cylinder, remove the spark plug and inspect it. Look for a worn electrode, heavy carbon buildup, oil fouling, or signs of coolant (a white, crystalline deposit). A wet plug could indicate a fuel injector issue.
   Typical fix: Replace the faulty spark plug. It is best practice to replace all six spark plugs 🎬 See this walkthrough for replacing Pentastar spark plugs and coils. as a set if they are near the end of their service life.
   Est. part cost: $10-$25 per plug
3. Failed Rocker Arm / Lifter Assembly 🟡 Medium Probability The 3.6L Pentastar engine is known for premature failure of the rocker arm needle bearings, which can seize, stop rotating, and damage the camshaft lobe. This leads to improper valve lift and a misfire. TSB 09-010-21 was issued for this issue on 2021 models, instructing dealers to replace all exhaust rocker arms for rough running complaints. This is a widely discussed issue in owner forums.
   How to confirm: A distinct metallic ticking noise from the upper engine is the primary symptom. If basic ignition and fuel checks don't solve the misfire, a technician will need to remove the valve cover to visually inspect the rocker arms and camshafts for scoring and wear. An in-cylinder pressure transducer can also reveal poor valve lift without disassembly.
   Typical fix: This is an advanced repair. It involves replacing all rocker arms (intake and exhaust) and lifters on the affected cylinder head. If the camshaft is damaged, it must also be replaced. The updated Mopar rocker arm part number is 5184296AH. 🎬 Watch: Step-by-step guide to replacing rocker arms and camshafts.
   Est. part cost: $200-$500 for a full set of rockers/lifters and a new camshaft
4. Faulty Fuel Injector ⚪ Low Probability → Shop Fuel Injector
   How to confirm: If the spark plug is dry and ignition components are good, the injector may not be firing. A technician can use a 'noid light' to confirm the injector is receiving an electrical pulse from the PCM. You can also check the injector's resistance with a multimeter (a good one should be between 12-14 ohms). Swapping the injector with another cylinder to see if the misfire follows is also a valid diagnostic step.
   Typical fix: Replace the failed fuel injector. The O-rings and seals should be replaced at the same time. This repair requires removing the upper intake manifold.
   Est. part cost: $50-$120 per injector

Rare But Worth Checking

• Blown Head Gasket: While less common, a failed head gasket can allow coolant to enter the cylinder, fouling the spark plug and causing a misfire. This would typically be accompanied by other symptoms like unexplained coolant loss, white smoke from the exhaust, or milky-looking engine oil. Some owners have reported head gasket failures on forums, with one 2019 Pacifica owner reporting a cracked engine block leaking coolant into cylinder 6, causing a P0306 and hydro-locking the engine.
• Low Fuel Pressure: A failing fuel pump or clogged filter can starve the engine for fuel, leading to misfires. This would usually be accompanied by a P0300 (random misfire) code or other fuel system codes, not just a single cylinder misfire.
• Failed Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) In very rare cases, the PCM's internal driver for an ignition coil or fuel injector can fail. This should only be considered after all other possibilities have been exhaustively ruled out. One owner fixed a persistent misfire by cleaning and re-seating the PCM connectors.

Diagnosis Steps

1. Connect an OBD-II scanner and read all stored codes. Identify the specific misfire code (e.g., P0302 for cylinder 2). Note any other codes, like P105D.
2. Listen to the engine for a rhythmic ticking noise. A tick points towards a potential mechanical valvetrain issue (rocker arms).
3. Swap the ignition coil from the misfiring cylinder with a coil from a non-misfiring cylinder. Clear codes and run the engine. If the P030x code moves to the other cylinder, the ignition coil is faulty.
4. If the misfire does not move, inspect the spark plug from the misfiring cylinder. Look for wear, damage, or fouling. Consider TSB 09-013-20 Rev. A for 2020-21 models.
5. If ignition components are good, test the fuel injector. Use a noid light to check for a signal from the PCM. Check injector resistance (should be 12-14 ohms).
6. If the above steps do not identify the cause, a mechanical issue is likely. Perform a compression test and a cylinder leak-down test on the affected cylinder to check for issues like a bad valve, failed head gasket, or piston ring damage.
7. If a mechanical issue is suspected and a ticking noise is present, remove the valve cover for visual inspection of the rocker arms and camshafts for scoring and wear.

Parts You'll Likely Need

• Ignition Coil (OEM #5149168AI) — A very common failure point for misfires on most modern engines, including the Pacifica.
  Trusted brands: Mopar, NGK, Denso, Delphi
  OEM price range: $50-$80
  Aftermarket price range: $30-$60
• Spark Plug (OEM #SP149125AE) — A standard maintenance item that can cause a misfire when worn or fouled. Some model years had defective plugs from the factory.
  Trusted brands: Mopar, NGK, Champion
  OEM price range: $20-$30
  Aftermarket price range: $10-$25
• Rocker Arm & Lifter Kit (OEM #5184296AH (Rocker Arm), 5184332AA (Lifter)) — The 'Pentastar Tick' is a known issue caused by failed rocker arm bearings, leading to misfires and potential camshaft damage. Part number 5184296AH is the updated rocker arm.
  Trusted brands: Mopar
  OEM price range: $15-$20 per rocker arm, $10-$15 per lifter
  Aftermarket price range: $150-$250 for a full engine kit (24 rockers, 24 lifters)

Related Codes That Often Appear With This One

• P0300 — If multiple cylinders are misfiring, P0300 (Random/Multiple Cylinder Misfire Detected) will be stored alongside P0363.
• P0301 - P0306 — P0363 is a response code. One of these codes will always be present to indicate which specific cylinder (1 through 6) is the source of the misfire that caused the fuel cut-off.
• P105D — A code like P105D (Intake Valve Stuck in High Lift Position) can appear with a misfire code, pointing towards a mechanical valvetrain issue like a stuck lifter or problem with the variable valve lift system.
• P06DD — This code for 'Engine Oil Pressure Control Circuit Stuck Off' can be related to misfires. Some technicians report that low oil pressure issues, which are also common on the Pentastar, can lead to problems with valvetrain components and subsequently cause misfires.

Technical Service Bulletins (TSBs) & Recalls

• TSB 09-010-21 (RRT 21-162): Addresses engine misfire and rough running on 2021 Pacifica models by replacing all exhaust rocker arm/lifter assemblies.

Platform-Specific Known Issues

• Rocker Arm Failure ('Pentastar Tick'): The most significant vehicle-specific issue for P0363 is the known tendency for the 3.6L Pentastar's rocker arms to fail. The needle bearings in the roller seize, causing the rocker to scrape against the camshaft lobe, leading to wear, a ticking noise, and eventually a misfire. TSB 09-010-21 specifically addresses this for 2021 models, but the issue is prevalent across many years and vehicles with this engine. An owner on a Jeep forum provides a detailed analysis of the failure mode.

Mechanic-Grade Diagnostic Values

• Ignition Coil Primary Resistance — expected: 0.4 - 2.0 Ohms. Failure: A reading outside this range indicates a faulty coil.
• Ignition Coil Secondary Resistance — expected: 6,000 - 11,000 Ohms (6kΩ - 11kΩ). Failure: A reading significantly outside this range or an open circuit (OL) indicates a faulty coil.
• Fuel Injector Coil Resistance — expected: 12.0 - 14.0 Ohms. Failure: An open circuit (OL), a short (near 0 Ohms), or a reading significantly different from other injectors on the same engine.
• Fuel Injector Pulse Width (at hot idle) — expected: 2.0 - 4.0 milliseconds (ms). Failure: A value of 0 ms indicates the PCM has shut down the injector driver; a value significantly different from other cylinders points to a problem.
• Low-Side Fuel Pressure (at fuel rail) — expected: ~58 PSI (400 kPa). Failure: Pressure that is significantly lower or drops under load can indicate a weak fuel pump.

Hidden / Shadow Codes Worth Checking

• Mode $06 Misfire Counts: The PCM tracks misfire events for each cylinder before they are frequent enough to set a hard P030x code. Viewing this data can confirm which cylinder is the source of an intermittent problem, even without a Check Engine Light. (see via Access Mode $06 data through a professional-grade OBD-II scanner or a tool like wiTECH, Autel, or BlueDriver. The specific test is often labeled 'Which cylinder is misfiring'.)

Scan Tool Commands That Help

• wiTECH (Dealer Tool) or advanced aftermarket: Misfire Counters / Which Cylinder is Misfiring — Use this to view live or historical misfire counts per cylinder to pinpoint the source of a random (P0300) or intermittent misfire before a specific P030x code is stored.
• wiTECH (Dealer Tool) or advanced aftermarket: Injector Kill / Power Balance Test — This bidirectional test allows you to disable one injector at a time. If disabling an injector causes no change in engine RPM or smoothness, it confirms that cylinder was not contributing, pointing to a fault in that specific cylinder's ignition, fuel, or mechanical components.

Real Owner Repair Stories

• Jeep Wrangler JK Forum (2013 Jeep JK 3.6L Pentastar (engine shared with Pacifica)) — Persistent misfires on cylinders 1, 3, & 5, along with about six other codes including air-to-fuel ratio imbalance.
  ❌ Tried (didn't work) Initial diagnosis pointed towards common causes, but the owner had recently replaced O2 sensors.
  ✅ What actually fixed it The root cause was incorrect O2 sensors. The owner had installed Bosch 15510 sensors, which were listed as a compatible part by the retailer (RockAuto), but were causing the PCM to receive bad data, leading to fuel trim issues and misfires. Replacing them with the correct Mopar sensors resolved all codes.
• CarComplaints.com (2019 Chrysler Pacifica) — Check engine light with code P0306 (Cylinder 6 Misfire), engine struggling to run.
  ❌ Tried (didn't work) The vehicle was towed to the dealership.
  ✅ What actually fixed it The dealership diagnosed a cracked engine block. Coolant was seeping into cylinder 6, causing the misfire and eventually hydro-locking the engine. The required repair was a complete engine block replacement at a quoted cost of over $11,000.
• Reddit r/AskMechanics (2014 Jeep Grand Cherokee 3.6L Pentastar) — Persistent P0305 (Cylinder 5 Misfire), worse on cold starts.
  ❌ Tried (didn't work) New spark plugs and ignition coils., New fuel injector on cylinder 5., Compression and leak-down tests were good., Oscilloscope check of injector and coil signals showed no issues., Visual inspection of valvetrain with valve cover removed looked good.
  ✅ What actually fixed it The final diagnosis suspected a tiny coolant leak into the cylinder when cold, which would not show up on a hot leak-down test. The technician noted one side of the piston was damp and clean, indicative of being steam-cleaned by coolant. The proposed next step was to pressurize the cooling system while pulling a vacuum on the cylinder to confirm the leak.

OEM Part Supersession History

• 5184296AD, 5184296AE, 5184296AF, 5184296AG → 5184296AH — The original rocker arm design was prone to premature needle bearing failure. The 'AH' revision is the updated part designed to be more durable and address the 'Pentastar Tick' issue.
• 5149168AI → 5149168AJ — Standard part revision for the ignition coil.
  Heads up: The parts are interchangeable, but the 'AJ' revision is the latest version.

Model Year Variations Within This Range

• 2017-2024: The 3.6L engine in the Pacifica is the 'Pentastar Upgrade' (sales code ERC or ERG), sometimes designated as 'RU'. This version features updates like a two-step variable valve lift (VVL) system and an EGR cooler, distinguishing it from the 'classic' Pentastar found in earlier vehicles.
• 2020-2021: Chrysler issued TSB 09-013-20 Rev. A for misfires caused by spark plugs with internal manufacturing cracks on some models within this range.
• 2021: Chrysler issued TSB 09-010-21 for some 2021 models, instructing dealers to replace all exhaust rocker arms to correct rough running, even without a specific misfire code.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Cracked Oil Filter Housing / Cooler Assembly 🔴 High — Extremely common across all 3.6L Pentastar applications. The plastic housing is prone to cracking from heat cycles, causing significant oil leaks into the engine valley, often misdiagnosed as a rear main seal leak.
• Engine Stop-Start (ESS) System Failure 🟠 Medium — Very common. The small, secondary auxiliary battery fails frequently (often every 2-3 years), disabling the ESS system and causing a 'Service Stop/Start System' warning on the dash. This can also lead to parasitic draws that drain the main battery. (Ref: TSB 18-002-19 REV A (software update))
• 9-Speed Automatic Transmission Problems 🟠 Medium — Commonly reported, especially on 2017-2018 models. Symptoms include harsh shifting, jerking, stalling, and occasional complete failure. Note: This is separate from the hybrid's eCVT transmission recalls. (Ref: Recall U85 (for a small number of 2018 vehicles))
• Power Sliding Door Malfunctions 🟡 Low — Frequently reported by owners. The doors may fail to open or close, get stuck, or have electrical faults preventing operation.
• Electrical Gremlins / Parasitic Battery Drain 🟠 Medium — Owners report various electrical issues, including infotainment system glitches and battery drain that can leave the vehicle unable to start. This is sometimes linked to the failing ESS auxiliary battery or faulty wiring.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this repair, used parts are generally not recommended due to the high failure rate of key components. A used ignition coil or fuel injector from a very low-mileage, verified running donor vehicle could be a budget-conscious choice, but the risk may outweigh the savings.

Donor-vehicle mileage cap: roughly under 30000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Verify the donor vehicle was not in a front-end collision.
• Check for signs of oil leaks or coolant residue around the engine.
• If possible, get the VIN to check the vehicle's service history for related repairs.

OEM-only on this vehicle (don't cheap out):

• Rocker Arms and Lifters: This is critical. The original design is flawed. Only use the newest revision OEM Mopar part (5184296AH) to ensure the problem is permanently fixed. Using used or cheap aftermarket rockers is almost guaranteed to result in a repeat failure.
• Camshafts: If a failed rocker arm has damaged a camshaft, replace it with a new OEM Mopar part. A used camshaft may have unseen wear or be from an engine that suffered the same rocker arm failure.
• O2 Sensors: The PCM is very sensitive. Use only Mopar-branded O2 sensors to avoid fuel trim issues that can cause phantom misfire codes.

Aftermarket brands forum-validated for this vehicle:

• Ignition Coils: NGK, Denso, Delphi
• Spark Plugs: NGK, Champion

Brands owners have reported issues with on this vehicle:

• Unbranded or 'white-box' rocker arm and lifter kits from online marketplaces. Many forum users report these failing quickly, sometimes within a few thousand miles.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0300 — Random or multiple cylinder misfire code that often accompanies P0363 when the PCM detects misfires without fuel cutoff.
• P0302 — A specific cylinder misfire code (Cylinder 2) used to identify which cylinder is causing the P0363 condition.
• P105D — A code that has been documented to appear alongside misfire codes on the 2017 Pacifica, often associated with valvetrain or intake issues.
• P0301 — Cylinder 1 misfire code; frequently triggered by the same rocker arm or ignition coil failures common to the Pentastar 3.6L engine.
• P0304 — Cylinder 4 misfire code; used during diagnostic 'coil swapping' to confirm if a faulty ignition coil is the root cause.

Frequently Asked Questions