P0300 on a 2013 Honda Cr V
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 2013 Honda Cr V
Ranked from 381 NHTSA owner complaints filed for this vehicle.
- 1
Defective VTC Actuator
High severityA faulty Variable Timing Control (VTC) actuator causes a loud rattle or grinding noise on cold start-up, which can lead to timing chain stretch and engine misfires (P0300). Look for cold-start rattling and check for related Honda TSBs.
Reported in 14 NHTSA complaints - 2
Stretched or Jumped Timing Chain
High severityOften a secondary failure to the VTC actuator, a stretched timing chain throws off engine timing, causing misfires and potentially catastrophic internal engine damage. Confirmed by checking timing marks and chain tension.
Reported in 5 NHTSA complaints - 3
Faulty Spark Plugs
Low severityWorn or fouled spark plugs fail to ignite the air-fuel mixture properly, leading to random misfires. Inspect spark plugs for wear, carbon buildup, or incorrect gap.
Common cause - 4
Faulty Ignition Coils
Medium severityA weak or failing ignition coil will not provide enough voltage to the spark plug, causing intermittent or consistent misfires. Swap coils to see if the misfire moves to another cylinder.
Common cause - 5
Vacuum Leaks
Medium severityUnmetered air entering the intake manifold leans out the air-fuel mixture, causing random misfires across multiple cylinders. Check hoses, intake gaskets, and use a smoke machine to find leaks.
Common cause - 6
Low Fuel Pressure / Faulty Fuel Injectors
Medium severityInadequate fuel delivery prevents proper combustion, triggering P0300. Test fuel pressure at the rail and inspect injectors for clogging or failure.
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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