P0300 on a 2022 Kia Telluride

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 2022 Kia Telluride

Ranked from 311 NHTSA owner complaints filed for this vehicle.

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1
Low compression from worn piston rings / cylinder-wall scoring
High severity
Multiple owners describe heavy oil consumption progressing to thrown rods or seized engines, and a borescope inspection directly documents ring damage, cylinder scoring, and coolant intrusion — all of which reduce cylinder sealing enough to misfire.
Reported in 7 NHTSA complaints
2
Oil starvation from a cracked plastic oil filter housing (known Telluride/Sorento defect)
High severity
The housing is documented to crack after routine oil changes, dumping oil and starving the engine of lubrication, which several owners report on this vehicle.
Reported in 3 NHTSA complaints
Parts:oil filter housing
3
Worn or fouled spark plugs
Low severity
Standard misfire wear item; inspect gap and deposits.
Common cause
Parts:spark plug
4
Failing ignition coil
Medium severity
A weakening coil drops spark energy on one cylinder; check resistance and swap-test between cylinders.
Common cause
Parts:ignition coil
5
Clogged or leaking fuel injector
Medium severity
Uneven fuel delivery on a cylinder causes a lean or rich misfire; check injector balance.
Common cause
Parts:fuel injector
6
Vacuum leak
Medium severity
Unmetered air leans out a cylinder enough to misfire, especially at idle.
Common cause
7
EGR valve or passage fault
Low severity
A stuck-open EGR valve disrupts combustion at idle/cruise; test EGR flow.
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