P0300 on a 2019 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 2019 Ford Edge

Ranked from 736 NHTSA owner complaints filed for this vehicle.

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1
Coolant intrusion into the cylinders from a known engine casting/gasket defect
High severity
Numerous owners report a documented design flaw (gasket failure between cylinders 2 and 3 on the 2.0L EcoBoost) that lets coolant leak directly into the combustion chambers, fouling combustion and causing a misfire; symptoms include white exhaust smoke, overheating, and a "Coolant Low" warning.
Reported in 8 NHTSA complaints
2
EGR cooler leak allowing coolant/exhaust dilution into the intake
High severity
One owner's vehicle stalled with thick white smoke and was diagnosed with an internal EGR cooler leak (documented in a Ford TSB), which disrupts the air/fuel charge enough to cause misfire and stalling.
Reported in 1 NHTSA complaint
Parts:EGR cooler
3
High-pressure fuel pump failure interrupting fuel delivery
High severity
One owner reported the high-pressure fuel pump failing three times in under 10,000 miles, causing the engine to shut down and crank-no-start - inadequate fuel delivery of this kind will misfire before it stalls.
Reported in 1 NHTSA complaint
Parts:high-pressure fuel pump
4
Worn or fouled spark plugs
Medium severity
Eroded electrodes or heavy carbon fouling widen the spark gap or foul it entirely, causing intermittent misfire, especially under load or on cold start.
Common cause
Parts:spark plugs
5
Failing ignition coil(s)
Medium severity
A weak or intermittently-shorting coil-on-plug unit misfires a specific cylinder, often worsening with heat or mileage.
Common cause
Parts:ignition coil
6
Clogged or leaking fuel injector(s)
Medium severity
A partially clogged injector under-fuels a cylinder while a leaking one over-fuels it; either creates a lean or rich misfire on that cylinder.
Common cause
Parts:fuel injector
7
Vacuum or intake leak
Low severity
Unmetered air entering after the mass airflow sensor leans out the mixture enough to cause a rough idle and random misfire.
Common cause
8
Carbon buildup on intake valves
Low severity
Direct-injection engines like this EcoBoost lack port-injection fuel wash over the valves, so carbon accumulates and disrupts airflow/mixture at the valve, contributing to misfire over time.
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