P0300 on a 2016 Chevrolet Equinox

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 Equinox

Ranked from 392 NHTSA owner complaints filed for this vehicle.

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1
Timing chain stretch/jump from chronic oil starvation (2.4L Ecotec oil-consumption defect)
High severity
This engine is documented (including a class-action lawsuit) for burning oil through worn piston rings with no low-oil warning; when oil runs critically low the timing chain stretches or jumps, throwing valve timing off — one owner's dealer diagnosed exactly this as a cylinder-4 misfire from piston-to-valve contact.
Reported in 10 NHTSA complaints
Parts:timing chain timing chain tensioner piston rings
2
Excessive engine oil consumption with no dash warning
High severity
Owners consistently report adding 1-2 quarts every few weeks with the low-oil light never illuminating — a defect specific to this engine that feeds directly into the timing-chain/misfire failure above.
Reported in 8 NHTSA complaints
Parts:piston rings oil pump
3
PCV valve freezing/clogging in cold weather causing crankcase overpressure and rear main seal failure
High severity
Multiple owners in freezing conditions had the PCV valve ice up and clog, spiking crankcase pressure and blowing the rear main seal, dumping oil and leading to sudden oil starvation and rough running.
Reported in 6 NHTSA complaints
Parts:PCV valve rear main seal
4
Spark plug/ignition circuit losing spark to a cylinder
Medium severity
One owner's mechanic found 'no power to one of the spark plugs anymore' following an engine failure, consistent with an ignition coil or wiring fault causing misfire.
Reported in 1 NHTSA complaint
Parts:ignition coil spark plugs
5
Worn spark plugs
Medium severity
Standard high-mileage wear item and a leading misfire cause on any engine.
Common cause
Parts:spark plugs
6
Vacuum/intake leak
Low severity
Unmetered air can lean a cylinder enough to misfire, especially at idle.
Common cause
7
Clogged or leaking fuel injector
Medium severity
Restricted or dribbling injectors disrupt the air-fuel ratio in an individual cylinder, causing a misfire.
Common cause
Parts:fuel injector
8
EGR valve fault
Low severity
A stuck-open EGR valve over-dilutes the intake charge, causing a misfire particularly at idle.
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