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2005 gmc 2500hd p0300 multiple cylinder misfire

2005 gmc 2500hd p0300 multiple cylinder misfire

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Error codes appeared on 2003 GMC Yukon PO170

Check the intake manifold gaskets for leakage. It will tend to run rougher in the morning when it is cold. Check for vacuum leaks on any hose connected to the intake plenum too.

Posted on Dec 13, 2009

  • 158 Answers

SOURCE: when i connect my detector

mar82is, Mario, Yes a PO300 code is for random misfires. This is an issue with the spark plugs, wires, and coils. What you should do is to pull all the wires, one at a time, and inspect the terminals that connect to the spark plugs and the coil. If they are corroded then replacing these will help to alleviate the problem. Also check the spark plugs. See if they are wet and smell like gas. If so then this will be one of the misfiring plugs. A properly firing spark plug will have a gray color to them. If they are black and sooty then you should replace them. To check the coils, what you can do is purchase an in-line spark tester. You will find these at any auto parts store and they are not expensive. Place the tester on the spark plug and reconnect the wire to the tester and watch the light as it flashes. Should you see any gaps in the time that the coil fires then you have a bad coil and this will need to be replaced. DO NOT try to connect this tester with the engine running. It is rare, but the fuel pump will cause this condition as well. This will be from a weak pump or a clogged fuel filter. What to do here is, If you have one, connect a fuel pressure tester to the schrader valve on the fuel rail and watch for any discrepancies in the pressure as the engine runs. If there is, then I would start with the filter because the pump is in the tank and this will have to removed from the vehicle to replace it. Good luck with this.

Posted on May 16, 2011

  • 55 Answers

SOURCE: PO300 Multiple Cylinder Misfire Detected on GMC 5.3L Yukon

If spark plugs and wires are done and it doesn't have a dead miss under load, usually it is the crank sensor acting up. It is a colon tab in all repair manuals

Posted on Mar 02, 2012

  • 458 Answers

SOURCE: P0300 Trouble Code

Those 2 codes together usually mean there is a vaccum leak(the intake is getting air that is not metered through the mass airflow sensor).Look for PCV and vaccum lines loose(you might have got it by repositioning the air cleaner)

Posted on Apr 15, 2012

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Have code p300 for 98 gmc jimmy


A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Aug 28, 2014 | Cars & Trucks

1 Answer

2003 gmc jimmy on hills loses power check engine blinks then stalls upon restart performs great runs well on flats and even not steep hills .


when engine light blink it is only one thing.......misfire you could have P0300,P0301 and so on
P0300 is multiple misfire
P0301 is cylinder no 1 misfire,the last number tell you the no cylinder
hope it helps

Mar 24, 2014 | 1995 GMC Jimmy

1 Answer

P0300 2006 envoy


P0300 indicates random multiple misfire. The engine computer is detecting a misfire on more than one cylinder.

Apr 20, 2012 | 2006 GMC Envoy

1 Answer

When my car is ran on computer is has cose PO300 PD. What does this indicate?


DTC P0300 - Random/Multiple Cylinder Misfire Detected
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

Hope this helps.

Oct 03, 2011 | 2004 Chevrolet Malibu

2 Answers

Cylinder 5 and im also getting p0507 idle is higher then expected. ive change plugs wire cap button cam sensor and distributor. but now its throwing the codes p0300 and p0507 it goes from p0300 to p0305...


po 300 is random/ multible cylinder misfire detected po507 idle system rpm high-- go to this site for the po507 meaning--www.obd-codes.com/p507 === please go to this site for the po300 code---- www.obd-codes.com/p0300

Random/Multiple Cylinder Misfire Detected have a good day !!

Feb 15, 2011 | 1997 GMC Sierra

1 Answer

2 minutes afer starter car engine ligth come flasher and code p0300


P0300 Random/Multiple Cylinder Misfire Detected This is sometimes a symptom to a clogged fuel filter or fuel line. When was the last time the fuel filter was changed? There are a lot of problems that can lead to a random cylinder misfire. lack of fuel, lack of spark, lack of compression. Check all three of these. Please let me know if this answers your quesion and please rate my response for me. Thank you

Apr 09, 2010 | 1995 GMC Jimmy

1 Answer

Engine code p 3000 p3001 on a 2005 dodge sx 2.0


if the codes are p3000 and p3001 then I am at a loss, I can't find these codes anywhere.
However if the codes are p0300 and p0301 then here they are
if that is the problem it sounds like it may be time for a tune-up, plugs n wires. hope this helps you

Jan 23, 2010 | 2005 Dodge Neon

1 Answer

2005 Dodge Durango


The p0300 What does that mean? Basically this means that the the car's computer has detected that not all of the engien's cylinders are firing properly.
A P0300 OBD DTC code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-
==================================
The p0430 What does that mean? Basically this means that the O2
downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions
system.

Apr 26, 2009 | 2005 Dodge Durango

2 Answers

Obd codes p0300 p0301 p0303 p0305 p0401


P0401 Exhaust Gas Recirculation Insufficient Flow Detected

P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected


I would check out the EGR valve. That maybe what is causing all the misfires.

Mar 24, 2009 | 1997 Toyota Camry

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