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P0300

P0300 on a 2016 Chrysler Town And Country

P0300 is a generic OBD2 powertrain code for random or multiple cylinder misfire. Unlike P0301 through P0308, it does not point to one specific cylinder, so the cause can be ignition, fuel, air, sensor, or mechanical.

Not your vehicle? See general P0300 info.

Most common causes on the 2016 Chrysler Town And Country

Ranked from 521 NHTSA owner complaints filed for this vehicle.

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  1. 1

    Low compression from worn cylinder(s) (Pentastar low-compression pattern)

    High severity

    Multiple owners report mechanic-confirmed single-cylinder misfires (cylinder 2, cylinder 3) and one describes cylinder 2 losing compression entirely and no longer firing — a known low-compression pattern on this Pentastar V6.

    Reported in 4 NHTSA complaints
  2. 2

    Worn or fouled spark plugs

    Low severity

    One owner had spark plugs replaced as part of a repair for the car shutting off/stalling; worn plugs are a leading cause of random misfire on this Pentastar V6.

    Reported in 1 NHTSA complaint
    Parts:spark plug
  3. 3

    Clogged or failing fuel injector

    Medium severity

    One owner's dealer diagnosis explicitly called for a #5 fuel injector replacement alongside a check-engine-light complaint.

    Reported in 1 NHTSA complaint
    Parts:fuel injector
  4. 4

    Vacuum leak (harness/intake)

    Medium severity

    The same dealer diagnosis that called for the fuel injector also called for a vacuum harness replacement, a direct source of a lean/misfire condition.

    Reported in 1 NHTSA complaint
    Parts:vacuum hose
  5. 5

    Carbon-fouled intake valves

    Low severity

    Carbon buildup on intake valves disrupts airflow and combustion, producing an intermittent misfire.

    Common cause
  6. 6

    EGR valve fault

    Low severity

    A stuck-open EGR valve can introduce excess exhaust gas at idle/low speed, causing a rough-running misfire.

    Common cause
    Parts:EGR valve

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These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0300 on your car still needs shop confirmation before any repair.

Common symptoms

  • Flashing or steady check engine light
  • Rough idle
  • Shaking under acceleration
  • Loss of power
  • Fuel smell from exhaust

What to check before replacing parts

1

Scan for cylinder-specific misfire codes

Look for: A companion P0301–P0308 pins the misfire to one cylinder — start there. P0300 with no cylinder code points at something hitting several at once: fuel pressure, a large vacuum leak, or timing.

2

Inspect the spark plugs and coils

Look for: Pull the plugs: black/sooty = rich, oily = oil intrusion, white/blistered = lean or overheating, cracked porcelain or an out-of-spec gap = replace. Then swap a coil to another cylinder — if a cylinder-specific code follows the coil, the coil is bad.

3

Check fuel trims for a vacuum leak

Look for: High positive short- and long-term trims (worst at idle, improving as RPM rises) mean unmetered air is getting in. Smoke-test the intake and listen for hissing.

4

Verify fuel pressure

Look for: Compare running/cranking pressure to the vehicle spec. Low or dropping pressure starves multiple cylinders and reads as a random misfire — suspect the pump, filter, or regulator.

5

Compression / leak-down test if ignition and fuel check out

Look for: A cylinder 15%+ below the others, or leak-down hissing from the intake (intake valve), exhaust (exhaust valve), or oil filler (rings), means the misfire is mechanical — not a swap-in part.

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Matching symptoms

Car Runs RoughFlashing Check Engine Light