P0300 on a 2016 Ford F 250 Regular Cab
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 2016 Ford F 250 Regular Cab
Ranked from 287 NHTSA owner complaints filed for this vehicle.
- 1
High-pressure (CP4) fuel pump failure contaminating the fuel system with metal debris
High severityMultiple owners report the Bosch CP4 pump self-destructing and sending metal shavings through the rail/injectors, starving cylinders of fuel and causing sudden misfire/shutdown.
Reported in 2 NHTSA complaints - 2
Fuel injector fault or leak-back causing diesel dilution of engine oil
Medium severityOne complaint documents diesel fuel consistently entering the engine oil, a known symptom of injector seal/return leakage that also disrupts combustion and can trigger misfire.
Reported in 1 NHTSA complaint - 3
Cylinder-specific mechanical damage (low compression from bent valve/scored bore)
High severityA dealer diagnosed internal damage isolated to cylinder #2 that caused a stall and no-restart, consistent with a compression-loss misfire.
Reported in 1 NHTSA complaint - 4
Failing glow plug(s) (hard cold-start misfire)
Low severityWeak or dead glow plugs on a diesel cause rough, misfiring starts and cylinder dropout until the block warms up.
Common causeParts:glow plugs - 5
Clogged fuel filter restricting fuel delivery
Medium severityA plugged filter starves injectors of fuel volume/pressure under load, producing misfire.
Common causeParts:fuel filter - 6
Low compression from worn piston rings/cylinder wear
Medium severityHigh-mileage wear reduces cylinder sealing, weakening combustion in one or more cylinders.
Common cause - 7
EGR valve/cooler fault disrupting combustion stability
Low severityA stuck or leaking EGR path upsets the air/exhaust-gas mixture entering the cylinders, producing rough running or misfire.
Common cause - 8
Charge-air/turbo boost leak causing lean, unstable combustion
Low severityA leaking intercooler hose or clamp reduces cylinder airflow/pressure unevenly, which can manifest as misfire under boost.
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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