P0300 on a 2011 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 2011 Ford Edge

Ranked from 1,801 NHTSA owner complaints filed for this vehicle.

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1
Ignition coil failure (repeated coil-pack breakdown, including melted packs)
High severity
Two owners in this batch had coils replaced for a cylinder misfire only to have coil packs melt and the misfire return; a failing coil is confirmed by swapping it to another cylinder and watching the misfire follow.
Reported in 2 NHTSA complaints
Parts:ignition coil
2
Worn or fouled spark plugs
Medium severity
Both misfire complaints in this batch had spark plugs replaced as part of the repair attempt; worn/fouled plugs are the most common misfire trigger on this V6.
Reported in 2 NHTSA complaints
Parts:spark plugs
3
PCM/ECM fault causing repeated ignition-system failures
High severity
In one case a shorted computer was blamed for destroying coils, and in another the dealer replaced the engine control module after coils kept failing; have the PCM's coil-driver circuits tested before repeat coil swaps.
Reported in 2 NHTSA complaints
Parts:engine control module (PCM)
4
Clogged or leaking fuel injector
Medium severity
Deposits or a leaking injector disrupt the air-fuel ratio on an individual cylinder enough to cause a misfire; check injector balance/flow rates.
Common cause
Parts:fuel injector
5
Vacuum or intake leak
Medium severity
A cracked intake boot or loose vacuum/PCV line leans out one or more cylinders, producing a misfire most noticeable at idle.
Common cause
6
Carbon-fouled intake valves
Medium severity
Carbon buildup on the valves disrupts airflow/sealing enough to misfire; a borescope inspection confirms it.
Common cause
7
Low cylinder compression from worn rings or valves
High severity
A compression or leak-down test showing one cylinder well below the others points to mechanical wear as the misfire source.
Common cause
8
EGR valve stuck open or flow fault
Low severity
Excess exhaust gas recirculated at the wrong time dilutes the intake charge enough to cause a misfire, especially 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