P0300 on a 2010 Chevrolet Silverado 1500 Hybrid
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 2010 Chevrolet Silverado 1500 Hybrid
Ranked from 422 NHTSA owner complaints filed for this vehicle.
- 1
Active Fuel Management (AFM/DOD) lifter and pushrod failure
High severityA well-documented failure on this 5.3L: collapsed or failed AFM lifters and camshaft lobe wear are repeatedly diagnosed here, causing a loud tap and a misfire/rough-running condition on the affected cylinder(s).
Reported in 5 NHTSA complaints - 2
Oil consumption fouling spark plugs
High severityOwners report this 5.3L burning several quarts of oil between changes, specifically fouling a spark plug and causing extreme power loss/misfire.
Reported in 2 NHTSA complaintsParts:spark plugs - 3
Persistent single-cylinder misfire surviving plug/coil/injector replacement (low compression / valvetrain)
Medium severityOne owner replaced spark plugs, wires, coils, and injectors twice and still had a repeating cylinder-6 misfire, pointing to a mechanical (valve or compression) fault rather than an ignition/fuel part.
Reported in 1 NHTSA complaint - 4
Worn spark plugs
Low severityPlugs beyond their service interval lose spark energy and misfire under load; inspect gap and fouling pattern.
Common causeParts:spark plugs - 5
Failing ignition coil
Medium severityA weak or cracked coil-near-plug unit drops spark to one cylinder; swap coils between cylinders to confirm.
Common causeParts:ignition coil - 6
Vacuum leak (intake gasket, hoses, brake booster line)
Medium severityUnmetered air leaning out a cylinder can present as a misfire, particularly at idle; smoke-test the intake.
Common cause - 7
Clogged or leaking fuel injector
Medium severityAn injector delivering too little or dribbling fuel starves or floods its cylinder, producing an isolated misfire.
Common causeParts:fuel injector - 8
EGR valve fault
Low severityA stuck-open EGR valve over-dilutes the intake charge and can cause a rough idle or misfire; test EGR flow.
Common causeParts: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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