P0300 on a 2017 Ford Escape
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 Escape
Ranked from 2,628 NHTSA owner complaints filed for this vehicle.
- 1
Coolant Intrusion into Cylinders (Cracked/Porous Engine Block or Head Gasket Failure)
High severityCoolant leaks internally into the cylinders due to a known block design flaw or head gasket failure, causing misfires, rough idle, white exhaust smoke, and rapid coolant loss without external leaks. Confirmed by low coolant levels, cooling system pressure test, and borescope inspection showing coolant in the cylinders.
Reported in 28 NHTSA complaints - 2
Worn or Faulty Spark Plugs
Low severitySpark plugs can wear out or become fouled, leading to incomplete combustion and random misfires. Confirmed by visual inspection of the spark plugs for wear, carbon buildup, or fouling.
Common cause - 3
Faulty Ignition Coils
Medium severityIgnition coils can fail or degrade over time, failing to provide the necessary spark to the spark plugs. Confirmed by testing coil resistance or swapping coils to see if the misfire moves to another cylinder.
Common cause - 4
Vacuum Leaks
Medium severityUnmetered air entering the intake manifold leans out the air/fuel mixture, causing random misfires across multiple cylinders. Confirmed by smoke testing the intake system or checking fuel trim data.
Common cause - 5
Low Fuel Pressure / Faulty Fuel Pump
Medium severityInadequate fuel delivery prevents proper combustion, leading to lean misfires. Confirmed by testing fuel pressure with a mechanical gauge and comparing to specifications.
Common cause - 6
Clogged or Faulty Fuel Injectors
Medium severityInjectors that are clogged or failing electrically will not deliver the correct amount of fuel, causing misfires. Confirmed by injector balance testing or observing injector pulse waveforms.
Common cause
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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