P0300 on a 2017 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 2017 Chevrolet Equinox
Ranked from 270 NHTSA owner complaints filed for this vehicle.
- 1
Excessive Oil Consumption / Oil Starvation
High severityThe 2.4L engine is known for burning excessive amounts of oil without triggering warning lights, leading to low oil levels, engine stalling, and catastrophic internal failure.
Reported in 11 NHTSA complaints - 2
Rear Main Seal Failure (PCV Icing)
High severityIn extreme cold weather, the PCV system can freeze, causing crankcase pressure to build up and blow out the rear main seal, resulting in rapid oil loss and engine failure.
Reported in 7 NHTSA complaints - 3
Timing Chain Failure
High severityOften a secondary result of oil starvation, the timing chain components fail, leading to engine stalling, misfires, and severe internal damage.
Reported in 4 NHTSA complaints - 4
Faulty Spark Plugs
Low severityWorn or fouled spark plugs are a standard cause of random/multiple misfires (P0300). Inspect for wear, carbon buildup, or oil fouling.
Common cause - 5
Defective Ignition Coils
Medium severityFailing ignition coils can cause intermittent or consistent misfires across multiple cylinders. Check for weak spark or swap coils to see if the misfire moves.
Common cause - 6
Vacuum Leaks
Medium severityUnmetered air entering the intake manifold leans out the air/fuel mixture, causing random misfires. Listen for hissing sounds and check fuel trim data.
Common cause - 7
Low Fuel Pressure
Medium severityA failing fuel pump or clogged fuel filter can starve the engine of fuel, leading to a lean condition and multiple cylinder misfires.
Common cause
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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