P0300 on a 2015 Ford Edge

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 Ford Edge

Ranked from 719 NHTSA owner complaints filed for this vehicle.

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1
Coolant intrusion into the cylinders from a cracked engine block/head gasket (documented EcoBoost defect)
High severity
The large majority of this VIN's complaints describe coolant entering one or more cylinders with diagnosed cylinder-specific misfires, tied to a known cracked-block/head-gasket defect on this engine family; the coolant fouls combustion and kills spark in the affected cylinder(s).
Reported in 23 NHTSA complaints
2
Oil-fouled spark plug(s) from excess oil consumption (worn piston rings)
Medium severity
One owner's mechanic found an oil-fouled plug and traced it to worn pistons/rings consuming oil; oil-fouled plugs misfire intermittently, especially at idle.
Reported in 1 NHTSA complaint
Parts:spark plugs
3
Coolant contaminating engine oil from a failing internal water pump (3.5L V6)
High severity
One owner described coolant turning the oil into milky sludge after an internal water pump failure, causing rough running/hesitation consistent with misfire.
Reported in 1 NHTSA complaint
Parts:water pump
4
Worn or fouled spark plugs (normal wear)
Low severity
Aged or improperly gapped plugs misfire under load; always the first thing to rule out on a random-misfire code.
Common cause
Parts:spark plugs
5
Failing ignition coil(s)
Medium severity
A weakening coil-on-plug unit drops spark energy, especially when hot, producing an intermittent misfire.
Common cause
Parts:ignition coil
6
Clogged or leaking fuel injector(s)
Medium severity
An injector delivering too little (clog) or dribbling fuel (leak) unbalances that cylinder's air-fuel ratio and can misfire.
Common cause
Parts:fuel injectors
7
Vacuum leak
Medium severity
Unmetered air entering through a cracked hose or gasket leans out one or more cylinders enough to misfire under light load.
Common cause
8
Carbon-fouled intake valves
Low severity
Direct-injection engines like this one don't wash the intake valves with fuel, so carbon buildup restricts and disrupts airflow into a cylinder, producing a misfire.
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