P0300 on a 2017 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 2017 Ford Edge

Ranked from 1,300 NHTSA owner complaints filed for this vehicle.

Sort by:

1
Coolant intrusion into the cylinders (2.0L EcoBoost design defect)
High severity
The overwhelming majority of complaints on this exact vehicle describe coolant leaking internally into one or more cylinders (Ford TSB 19-2346 / 22-2229), causing rough running, misfire codes on the affected cylinder, white exhaust smoke, and eventual engine failure. This is a documented block/head design flaw, not routine wear.
Reported in 30 NHTSA complaints
2
Worn spark plugs / failing ignition coils
Medium severity
Several owners had spark plugs and ignition coils replaced first (the standard misfire fix) before coolant intrusion was correctly diagnosed as the underlying cause; plugs/coils are still a legitimate independent wear item.
Reported in 3 NHTSA complaints
Parts:spark plug ignition coil
3
Vacuum or intake leak
Medium severity
Unmetered air entering after the MAF sensor leans out a cylinder or bank and can present as a misfire.
Common cause
4
Clogged or leaking fuel injectors
Medium severity
A partially clogged or dribbling injector disrupts the air-fuel ratio on one cylinder.
Common cause
Parts:fuel injector
5
Carbon-fouled valves
Low severity
Direct-injection engines like this EcoBoost are prone to intake-valve carbon buildup that disrupts airflow and combustion.
Common cause
6
Low compression from worn rings or valves
Low severity
Reduced cylinder sealing lowers combustion efficiency enough to misfire under load.
Common cause
7
EGR valve fault
Low severity
A stuck-open EGR valve introduces excess exhaust gas that can destabilize combustion and misfire at idle.
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