P0300 on a 2016 Chevrolet Colorado

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 Colorado

Ranked from 695 NHTSA owner complaints filed for this vehicle.

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1
Cracked piston / cylinder mechanical failure
High severity
Multiple owners of this 2.8L Duramax I4 population report a cracked piston (cylinders #1 and #2 documented) that let a fuel injector bore through it, causing violent shaking and sudden loss of power at highway speed -- a severe, engine-damaging cause of misfire.
Reported in 2 NHTSA complaints
2
Failing canister purge valve / vent valve
Medium severity
Dealers diagnosed a bad purge valve (and, on one truck, a suspect vent valve) after owners reported excessive vibration and near-stalling under light-throttle/deceleration conditions -- a stuck purge valve can dump unmetered vapor into the intake and upset combustion enough to misfire.
Reported in 2 NHTSA complaints
Parts:purge valve
3
Failing mass air flow (MAF) sensor
Medium severity
Diagnosed alongside the purge valve on one truck that shuddered and lost power going up an incline; a skewed MAF signal causes incorrect fueling and can trigger a misfire.
Reported in 1 NHTSA complaint
Parts:mass airflow sensor
4
Worn spark plugs
Low severity
Worn or fouled plugs are the single most common misfire cause; check gap/wear and look for oil fouling.
Common cause
Parts:spark plug
5
Failing ignition coil
Medium severity
A weak or intermittently-arcing coil produces a repeatable misfire on the affected cylinder(s), often worse under load or when hot.
Common cause
Parts:ignition coil
6
Clogged or leaking fuel injector
Medium severity
A partially clogged or dribbling injector unbalances the air/fuel ratio on one cylinder, producing a misfire.
Common cause
Parts:fuel injector
7
Vacuum leak
Low severity
Unmetered air entering through a cracked hose or gasket leans out one or more cylinders enough to misfire, especially at idle.
Common cause
8
Carbon-fouled intake valves
Low severity
Direct-injected engines are prone to carbon buildup on the backs of the intake valves, which can disrupt airflow/atomization enough to cause a 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