P0300 on a 2017 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 2017 Ford F 250 Regular Cab
Ranked from 1,155 NHTSA owner complaints filed for this vehicle.
- 1
Metal debris from a failed high-pressure fuel pump contaminating injectors
High severityTwo owners on this exact truck had the high-pressure fuel pump fail and shed metal shavings throughout the fuel system, damaging injectors and causing an engine/misfire condition after the check-engine light came on.
Reported in 2 NHTSA complaints - 2
Defective/failing intake manifold
Medium severityTwo separate owners on this vehicle had a defective intake manifold diagnosed after hearing an abnormal knocking/ticking sound from the engine.
Reported in 2 NHTSA complaintsParts:intake manifold - 3
Faulty EGR valve disrupting combustion
Medium severityDealer diagnosis on this vehicle found the EGR valve faulty and in need of replacement after a persistent check-engine light.
Reported in 1 NHTSA complaintParts:EGR valve - 4
Faulty crank/cam position or other engine sensor
Low severityOwner had an engine sensor replaced after a persistent check-engine light, but the failure recurred.
Reported in 1 NHTSA complaint - 5
Worn or fouled fuel injector(s)
Medium severityInjector wear or fouling causes an uneven spray pattern and misfire under load; common after any fuel contamination event.
Common causeParts:fuel injector - 6
Clogged fuel filter restricting delivery
Medium severityA clogged filter starves the engine of fuel under load, producing a misfire or stumble.
Common causeParts:fuel filter - 7
Vacuum or intake leak
Low severityUnmetered air entering the intake tract leans out a cylinder enough to misfire.
Common cause - 8
Low compression from internal engine wear
High severityWorn rings, valves, or head gasket reduce a cylinder's ability to build compression, producing a chronic misfire; confirm with a compression test.
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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