P0300 on a 2020 Chevrolet Silverado 1500

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 2020 Chevrolet Silverado 1500

Ranked from 691 NHTSA owner complaints filed for this vehicle.

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1
Collapsed/failed valve lifters from the AFM/DFM cylinder-deactivation system (GM 5.3L & 6.2L L82/L87)
High severity
This is a widely reported and litigated GM defect: Active/Dynamic Fuel Management lifters collapse, bending pushrods and scoring the camshaft, producing exactly the loud ticking, misfire codes, and sudden loss of power described across this large batch of complaints, often followed by a full engine replacement.
Reported in 16 NHTSA complaints
Parts:valve lifters camshaft pushrods
2
Bent pushrod / damaged camshaft secondary to lifter failure
Medium severity
Several owners specifically describe a bent pushrod or scored camshaft found once the collapsed lifter was inspected, which directly produces a cylinder misfire.
Reported in 2 NHTSA complaints
Parts:pushrods camshaft
3
Faulty fuel injector
Low severity
One owner's dealer pulled a specific trouble code for cylinder/injector number eight before recommending engine replacement.
Reported in 1 NHTSA complaint
Parts:fuel injector
4
Worn or fouled spark plugs (normal wear)
Low severity
A baseline misfire cause independent of the lifter issue; gapped-out or fouled plugs misfire under load.
Common cause
Parts:spark plugs
5
Failing ignition coil(s)
Medium severity
A weak coil-on-plug unit produces an intermittent, cylinder-specific misfire.
Common cause
Parts:ignition coil
6
Vacuum leak
Low severity
Unmetered air entering the intake causes a lean misfire, most noticeable at idle.
Common cause
7
Carbon-fouled valves / low compression
Low severity
Carbon buildup on direct-injection intake valves combined with worn rings/valves can drop compression enough to misfire.
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