Question about 2000 Pontiac Grand Am GT

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2000 Pontiac Grand AM trouble code P0300

Code states "random multiple cylinder misfire detected" but I'm at a loss what more I need to do. I've replaced the fuel filter, fuel pump, changed spark plugs, coil housing, spark plug boots and it's still missing. I've checked the coil with an OHM meter and it was within specks.

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  • Gary Hayes
    Gary Hayes Oct 15, 2008

    Nope, damp or bone dry the problem exists.



    Forgot to say that it is a Quad Four 2.4 engine if that helps anyone.

  • james_porter Oct 29, 2008

    I have a 2000 3.4 liter Pontiac Grand Am GT with a P0300 code. At first it was a p0301 which was a broken plug. Replaced it and came up with the 300 code. Replaced the coil and came up with the 300 code again but runs worse. What do I do?

  • Anonymous Feb 25, 2009

    same with 2.3

  • Anonymous May 04, 2009

    pontiacs ****!!!!!!!!! I got the same problem

  • idare_ya May 11, 2010

    Does it happen more often when wet or damp? Im thinking cracked coil try looking at engine in dark for arching.

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  • Pontiac Master
  • 331 Answers

Im surprised that didn't fix it. On the Quad4 engine its usually a cracked coil housing.
Have you checked:

  • fuel injectors / fuel pressure
  • coolant temp sensor
  • compression - to check for bad head gasket
  • ignition control module
  • EGR system - make sure the valve isn't stuck
  • crank position sensor.
The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set.

Posted on Oct 15, 2008

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I just had a simular problem. I didn't want to spend a lot of money I didn't have so I spent days trying things that were past due on the maintenance or required a lot of labor but little money. It turned out to be my first thought, ICM. I didn't want to trial and error this part @ $150.00. Then my friend suggested a junk yard. $40 bucks got me the whole ignition pack. I now have a coil tower housing, two coils and cover for spares and the problem is fixed for $40.00. Dont be afraid to buy these parts from the recycle yards.

Posted on Sep 29, 2012

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  • 4 Answers

Your problem maybe the crankshaft position sensor and the camshaft position sensor


geo5434

Posted on Oct 12, 2011

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2 Answers

Why the loss of power and po300 code?


HARD TO SAY WITH OUT BEING THERE BUT THIS MIGHT HELP .
Crankshaft sensor Was the trouble with my 99 Chevy truck after replacing many components like coil cap rotor wires and so on .
http://www.obd-codes.com/p0102 Code P0300 Causes and Fixes Code p0300 is a code that is generated when your engine has a misfire that is not related to only one cylinder. Sometimes this code will be set in addition to other codes such as p0301 which means that there is a misfire on cylinder 1 (cylinder 1 is the number one cylinder when looking at the firing order. It is generally the forward most cylinder on the engine.). If these engine codes are present as well the you should diagnose those first as they are probably causing code p0300.
This code will set your check engine light and needs to be fixed as soon as possible. If it is not then you will probably need to replace your catalytic converter as well as the problem that is causing your misfire.
There are many causes for this obd code. Since it is a "random misfire" or "multiple misfire" this means that the misfire is on different cylinders and not just one all the time.
Common Causes
  • Low Fuel Pressure
  • Vacuum Leak
  • EGR system malfunction
  • Internal Engine Problems (such as low compression)
Less Common Causes
  • Faulty Coil
  • Faulty Spark Plugs and/or Wires
  • Camshaft or Crankshaft sensors
  • Ignition module
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Random multiple misfire P0300, P0302, P0304 on 2006 Kia Rio


A competent mechanic will check all probable causes associated with these DTC codes.
Code P0300: Random-Multiple misfire detected. Probable causes:
1. Vacuum leaks, damaged hoses, or improper routing
2. Fuel contamination
3. Ignition system - Ignition module, coil, spark plugs and wires
4. Fuel system
Code P0302: Cylinder 2 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system
Code 0304: Cylinder 4 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system

Be sure the invoice enumerates all of these probable causes as having been checked. Also, some of the replacement parts installed earlier may be faulty.

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Code p0300 came up on my 97 olds aurora what does it mean and how do I fix it?


code p0300 refers to random/multiple cylinder/s--misfire detected===causes--spark plug/s--HT lead/s---injector/s--ignition coil/s---low compression---wiring. Most of your mates will tell you to replace the plugs and leads and that may fix it but injectors are a major fault in misfires. So have a pressure test done on the fuel manifold first and check the fuel pump/pressure regulator/filter. If the pump is not producing fuel or the regulator is set too low then the injectors will not deliver the fuel at the correct amount at the right time (misfire- random cylinder). Plugs and leads will cause a constant misfire not every wherever cylinder.

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What causes 2005 2.5l volvo to misfire and show code random multiple misfires i replaced plugs but no good


I would take it back and demand a refund. Could be the crank or cam sensors, an intake leak, faulty coil, or a list of other components.

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Engine cranks but wont start has an obd p 300 &p304 help me


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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 !!

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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

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2 Answers

98 camry engine light on w/misfires & system too lean


take sample of your fuel into clear plastic bottle from fuel line
is there any water present?
this can cause these codes and then not go on storing codes for other bank even though that bank will be missfiring also due to water & P0300 Random/Multiple Cylinder Misfire Detected being logged
check all connections to coils/leads & wiring connectors
due to miss fire codes for cyl 1,3,5 all on the same bank
also look and check for air leaks on that bank (hose knocked off or splithose)inlet manifold gasket,brake booster etc...
3 injectors being blocked slightly on same bank posible!!!
check wires and signal

was it running like this b4 tune up & repairs?
this is what codes are
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P0300 Random/Multiple Cylinder Misfire Detected
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P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected

the last code is for trans due to misfire/running lean on bank 1 probably a torque problem code
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