P0300 on a 2010 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 2010 Ford Edge

Ranked from 672 NHTSA owner complaints filed for this vehicle.

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1
Ignition coil failure / coil-on-plug breakdown
Medium severity
One owner had a coil burn up and damage the PCM, and another was told both the coils and spark plugs needed replacing after coil issues — a recurring misfire pattern on this V6.
Reported in 2 NHTSA complaints
Parts:ignition coil spark plugs
2
Coolant intrusion into cylinders from internal water pump failure (3.5L Duratec)
High severity
This engine's water pump sits inside the timing cover; owners here confirm coolant mixing with engine oil after pump failure, which fouls combustion and produces rough-running/misfire.
Reported in 2 NHTSA complaints
Parts:water pump
3
Worn spark plugs
Low severity
Standard high-mileage wear item; widened electrode gap misfires under load or acceleration.
Common cause
Parts:spark plugs
4
Clogged or leaking fuel injector(s)
Medium severity
A partially clogged or dribbling injector leans out or floods an individual cylinder, causing a misfire on that cylinder.
Common cause
Parts:fuel injector
5
Vacuum or intake leak
Low severity
Unmetered air entering after the MAF leans out one or more cylinders enough to misfire, especially at idle.
Common cause
6
Carbon-fouled valves or injector deposits
Low severity
Carbon buildup disrupts spray pattern/airflow and can cause an intermittent misfire that clears somewhat with a fuel-system or intake cleaning.
Common cause
7
Low cylinder compression (worn rings or valves)
High severity
Mechanical wear reduces cylinder sealing enough that combustion is incomplete, registering as a misfire.
Common cause
8
EGR valve stuck open or faulty
Low severity
Excess exhaust gas recirculated at the wrong time dilutes the intake charge and can trigger a misfire, particularly at idle/light load.
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

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