P0300 on a 2024 Hyundai Palisade

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 2024 Hyundai Palisade

Ranked from 371 NHTSA owner complaints filed for this vehicle.

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1
Engine valve spring failure (NHTSA recall campaign 24V106000 / 'Recall 255')
High severity
Multiple owners report the engine shaking violently with the check-engine light on, explicitly diagnosed as a valve-spring condition under Hyundai's active engine recall on this model/year — a well-documented root cause of misfire on these vehicles.
Reported in 8 NHTSA complaints
Parts:valve springs
2
High oil consumption / worn piston rings
Medium severity
One owner reported needing 6 quarts of oil added in under 3,000 miles, consistent with the low-compression misfire pattern seen on this engine family; verify with a compression/leak-down test.
Reported in 1 NHTSA complaint
3
Worn spark plugs
Low severity
Standard misfire cause; inspect gap and electrode condition.
Common cause
Parts:spark plugs
4
Failing ignition coils
Medium severity
A weak coil-on-plug unit drops spark energy to a single cylinder; swap-test to isolate.
Common cause
Parts:ignition coils
5
Clogged or leaking fuel injectors
Medium severity
Uneven injector spray causes cylinder-specific lean/rich misfire; check injector balance rates.
Common cause
Parts:fuel injectors
6
Vacuum or intake leaks
Medium severity
Unmetered air causes lean misfire, most noticeable at idle; smoke-test the intake tract.
Common cause
7
EGR valve fault
Low severity
A stuck-open EGR dilutes the intake charge unevenly and can set a random misfire.
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