P0300 on a 2016 Chevrolet Malibu Limited

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 Chevrolet Malibu Limited

Ranked from 810 NHTSA owner complaints filed for this vehicle.

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1
Cracked piston / piston damage on the 1.5L/2.0L turbo four (low compression misfire)
High severity
Multiple owners had rough idle, hesitation, and a diagnosed cylinder misfire (one explicitly a scanned P0302) traced to a cracked piston by the dealer; one complaint flags this as "a known issue with this model year and engine" and ties it to GM's Stochastic Pre-Ignition (SPI) monitoring campaign on the 2.0L turbo.
Reported in 4 NHTSA complaints
2
Vacuum/brake-booster pump failure sending debris into the engine, damaging camshaft/timing components
High severity
The oil-lubricated brake-booster vacuum pump has a small oil-filter screen that clogs, runs dry, and disintegrates into the top of the engine, damaging camshafts and timing gears - which disrupts valve timing and produces rough running/misfire ahead of a full engine failure.
Reported in 4 NHTSA complaints
Parts:vacuum pump
3
Head gasket failure (oil/coolant intrusion into a cylinder)
High severity
Owners report the main head gasket failing and leaking, and a separate case of a blown head gasket found only after the engine ran with no oil and shook violently - either scenario lets fluid into a cylinder and disrupts combustion.
Reported in 2 NHTSA complaints
Parts:head gasket
4
Worn spark plugs
Low severity
Worn or improperly gapped plugs are the most common cause of a random misfire code; check for excessive gap, fouling, or the wrong heat range.
Common cause
Parts:spark plugs
5
Failing ignition coil(s)
Medium severity
A weak or intermittently-failing coil (or coil-on-plug pack) drops spark energy to one or more cylinders, especially under load.
Common cause
Parts:ignition coil
6
Clogged or leaking fuel injector(s)
Medium severity
A partially clogged or dribbling injector unbalances the air/fuel mixture in a single cylinder, producing a repeatable misfire.
Common cause
Parts:fuel injector
7
Vacuum/intake leaks
Medium severity
Unmetered air entering after the MAF leans out one or more cylinders enough to misfire, especially at idle.
Common cause
8
Carbon-fouled intake valves
Low severity
Direct-injection engines (no fuel washing the intake valves) are prone to carbon buildup that disrupts airflow and combustion at low RPM.
Common cause
9
EGR valve fault
Low severity
A stuck-open EGR valve dilutes the intake charge at idle/low load enough to cause a 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