P0300 on a 2015 Chrysler 200

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 2015 Chrysler 200

Ranked from 1,983 NHTSA owner complaints filed for this vehicle.

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1
Worn spark plugs and/or failing ignition coil(s)
Medium severity
Owner replaced spark plugs, ignition coil, a sensor, and cleaned the injectors/throttle body after a confirmed cylinder-4 misfire code; the misfire persisted, but ignition components were the first-line replacement on this exact fault.
Reported in 1 NHTSA complaint
Parts:spark plug ignition coil
2
Weak fuel pump reducing fuel delivery under load
Medium severity
An independent mechanic replaced the fuel pump (along with cooling components) after this vehicle set an engine misfire code with the check-engine light on.
Reported in 1 NHTSA complaint
Parts:fuel pump
3
Catalytic converter breaking up internally and sending debris into the cylinder
High severity
Dealer diagnosis on this vehicle found the catalytic converter had failed internally on a cylinder-6 misfire complaint, with metal debris entering the engine and causing damage.
Reported in 1 NHTSA complaint
Parts:catalytic converter
4
Manufacturer-acknowledged internal engine defect (per TSB) causing misfire
High severity
Owner's check-engine/misfire event was confirmed by the dealer as a known issue referencing a Chrysler TSB, ultimately requiring a full engine replacement with no prior warning.
Reported in 1 NHTSA complaint
5
Faulty camshaft position or oxygen sensor
Medium severity
Owner reports repeated shop visits for an O2 sensor or camshaft position sensor (cylinder/bank 6) tied to a persistent check-engine light and driveability concern.
Reported in 1 NHTSA complaint
Parts:camshaft position sensor oxygen sensor
6
Clogged or leaking fuel injector(s)
Medium severity
A partially clogged or leaking injector under- or over-fuels a cylinder, producing an intermittent misfire.
Common cause
Parts:fuel injector
7
Vacuum leak
Medium severity
Unmetered air entering through a cracked hose or intake gasket leans out one or more cylinders enough to misfire, especially at idle.
Common cause
8
Low cylinder compression from worn rings/valves
High severity
Mechanical wear reduces a cylinder's ability to build compression, causing a chronic misfire that ignition/fuel parts won't fix; confirm with a compression or leak-down test.
Common cause

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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

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.

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.

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.

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.

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 Rough Flashing Check Engine Light