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Severity: HighHonda

P0300 on Honda Vehicles: Random/Multiple Cylinder Misfire Detected

The engine computer sees misfires that jump between cylinders or hit several cylinders at once. P0300 →

37Complaints mentioning the code
#3Rank among 18 brands
5.1%Share of Honda DTC complaints

In NHTSA owner complaints we analyzed for Honda, P0300 was mentioned 37 times.

Notes by brand

Honda V6 engines with Variable Cylinder Management (Accord, Odyssey, Pilot) can burn oil in the cylinders that shut off during cruising. That fouls their spark plugs and sets misfire codes. Oily, carbon-caked plugs on one bank are the telltale sign.

Most mentioned models

Honda Accord11
Honda Cr-V10
Honda Fit5
Honda Pilot5
Honda Odyssey3
Honda Accord Crosstour1

Model years mentioned

Model years mentioned – Honda P03001111132144163171718919
2011: 1 · 2013: 1 · 2014: 2 · 2016: 4 · 2017: 3 · 2018: 17 · 2019: 9

Components named in these complaints

  • Engine (26)
  • Fuel/propulsion System (21)
  • Electrical System (6)
  • Forward Collision Avoidance (5)
  • Power Train (4)

Often appears together with

P0304 Powertrain Cylinder 4 is misfiring. Its end or rear position makes water, oil and intake leaks common… Moderate P0301 Powertrain Cylinder 1 is repeatedly failing to fire. The cause is almost always its coil, plug, injector… Moderate P0303 Powertrain Cylinder 3 is misfiring. Check whether it misses at idle or under load before you blame… Moderate P0302 Powertrain Cylinder 2 keeps misfiring. On inline engines it's a middle cylinder, so rule out coolant… Moderate P0306 Powertrain Cylinder 6 is misfiring. On an inline-six it's the hot rear cylinder; on GM and Hemi V8s it can… Moderate P0172 Powertrain The engine computer is pulling as much fuel as it's allowed on bank 1 and the mixture is still… Moderate

Possible causes

  1. Worn or fouled spark plugs past their service interval. Many are rated for about 100,000 miles, but oil-burning or turbocharged engines wear them out much sooner.28%
  2. Vacuum leak (cracked PCV hose, leaking intake gasket, split brake booster hose) leaning out every cylinder, worst at idle20%
  3. Low fuel pressure from a weak fuel pump, clogged filter or failing pressure regulator15%
  4. More than one weak ignition coil, or coil boots arcing to ground after water got into the plug wells12%

P0300: Diagnosis step by step →

Related codes

HondaIgnition & MisfireCheck engine light flashingCheck engine light onRough idleLoss of powerPoor fuel economy P0300 · Ford

Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.