P0300 on a 2010 Dodge Grand Caravan Cargo

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 2010 Dodge Grand Caravan Cargo

Ranked from 1,038 NHTSA owner complaints filed for this vehicle.

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1
Cylinder misfire from a driveability fault not fully resolved by initial repair
Medium severity
One owner had a dealer-confirmed cylinder #5 misfire with a check-engine light; after the repair the van later resumed stalling at low speed with no code stored, suggesting an intermittent ignition/fuel fault.
Reported in 1 NHTSA complaint
2
Cylinder head gasket failure (coolant/compression loss)
High severity
A blown or leaking head gasket lets coolant into a cylinder or drops compression, causing a rough-running, misfiring cylinder.
Reported in 1 NHTSA complaint
Parts:cylinder head gasket
3
Worn or fouled spark plugs
Low severity
Aged or fouled plugs are the most common source of a random/multiple misfire code on high-mileage minivans; check gap and electrode wear.
Common cause
Parts:spark plug
4
Failing ignition coil(s)
Medium severity
A weak or cracked coil (or coil pack) drops spark energy to one or more cylinders, especially under load or when hot.
Common cause
Parts:ignition coil
5
Clogged or leaking fuel injector
Medium severity
A partially clogged or dribbling injector under- or over-fuels a cylinder, producing a steady misfire.
Common cause
Parts:fuel injector
6
Vacuum or intake leak
Medium severity
Cracked intake boots or vacuum hoses lean out one or more cylinders enough to cause a misfire, especially at idle.
Common cause
7
Carbon-fouled intake valves
Low severity
Carbon buildup on the valves disrupts airflow/sealing on individual cylinders over time, producing an intermittent misfire.
Common cause
8
Low compression from worn rings or valves
High severity
Mechanical wear reduces a cylinder's ability to seal and burn fuel cleanly; a compression or leakdown test will confirm.
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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Matching symptoms

Car Runs Rough Flashing Check Engine Light