P0300 on a 2022 Chevrolet Silverado 1500 Ltd
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 Chevrolet Silverado 1500 Ltd
Ranked from 577 NHTSA owner complaints filed for this vehicle.
- 1
Spun/worn crankshaft or connecting-rod bearings (GM recall N252494001/002, 6.2L L87)
High severityA wave of owners describe a loud tick/knock followed by sudden, catastrophic engine seizure tied to GM's L87 bearing recall; rough running is commonly reported in the lead-up to full failure.
Reported in 8 NHTSA complaints - 2
Valve lifter / roller-follower failure taking out the camshaft (6.2L L87)
High severityMultiple owners had a lifter or roller-follower failure diagnosed that chewed up a camshaft lobe, with one independent shop explicitly documenting the resulting rough-running/misfire condition before teardown.
Reported in 6 NHTSA complaints - 3
Crankshaft position (CKP) sensor circuit failure / chafed wiring harness
High severityAn owner documents an intermittent CKP sensor circuit failure from harness chafing (GM TSB #24-NA-012) causing violent jerking consistent with a misfire/timing-sync fault; another logged a related crank-alignment DTC P0016.
Reported in 2 NHTSA complaints - 4
Failed fuel injector
Medium severityOne owner's truck was shaking and repeatedly shutting off, and the dealer diagnosed and replaced a failed fuel injector.
Reported in 1 NHTSA complaintParts:fuel injector - 5
Worn or fouled spark plugs
Low severityStandard high-mileage wear item and the most common generic cause of a random misfire code on any V8.
Common causeParts:spark plugs - 6
Vacuum or intake air leak
Medium severityUnmetered air downstream of the MAF sensor leans out one or more cylinders enough to cause an intermittent misfire.
Common cause - 7
Carbon-fouled intake valves (direct injection)
Low severityDirect-injected engines like the L87 have no fuel washing the intake valves, so carbon buildup on the valves is a common contributor to rough idle and misfire over time.
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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