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Po300 misfire multiple - Sonoma GMC Cars & Trucks

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On the GM you have a bad coil or coils, sorry. Replace all the coils to be sure, 99% of the time the P0300 is one or more of the ign. coils breaking down due to heat and or age. Be sure to get some dielectric grease for the connections and get new rubber grommets that are under the coils.

Posted on Mar 17, 2011

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Codes PO300-PO305 TCS and emission lights on, runs OK except sl rough at lower speeds


you have multiple misfire po300 and cylinder 5 po305 misfire.the misfire is causing the rough running.The computer has disabled your traction control.You either have carbon in the EGR which simulates a vacuum leak,bad spark plugs,a leaking intake manifold,or low fuel pressure from a bad pump or clogged filter.
i would start with the spark plugs and fuel filter

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I have a 1997 toyota 4runner and codes po300


P0300- Random/Multiple Cylinder Misfire Detected or Misfiring Of Multiple Cylinders


check your spark plugs, plug wires & ignition coil

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I have Codes po300,po303,po303pd toyota 4 runner


P0300 - Random/Multiple Cylinder Misfire Detected or Misfiring Of Multiple Cylinders
P0303 Cylinder 3 Misfire Detected

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Multiple engine codes PO300, PO303, PO306. what is going bad on this 2005 kia sorento?


I've had similar issues. The fix I used was to take my vehicle to AAMCO and let them run a diagnostic check. Most often it will be at little or no cost and, if you don't want to mess with the fix anymore, they can fix it onsite.

Sep 07, 2014 | 2005 Kia Sorento

1 Answer

I'm trying to find out what po303 and po300 means


P0300: Random/Multiple Cylinder Misfire Detected
P0303: Cylinder 3 Misfire Detected
It looks like cylinder 3 isn't firing properly.

Apr 22, 2013 | Cars & Trucks

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97 toy corolla DTC po300 po301 po401 po402


po300 random/multiple cylinder misfire detected po301 cylinder 1misfire detected po401egr flow insufficient po 402egr flow excessive

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I have a diagnostic trouble codes p1768,po300,and a po420. what does this mean?


I have tow of the three requested codes. po300 is misfire detected at multiple cylinders. See po301-306 represent the cylinder # misfire. So 301 is cylinder #1 misfire.

po420 is Catalytic Converter Efficiency Failure

Oct 08, 2009 | 1996 Plymouth Voyager

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