Question about 2000 Pontiac Grand Am GT

3 Answers

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


geo5434

Posted on Oct 12, 2011

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1 Answer

P0300


Im assuming your asking about the ODB-II codes, this code,P0300 Random/Multiple Cylinder Misfire Detected.
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.
Here are a few things that could be the cause.
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer

    I would start things out with a tune up, new plugs and wires, wires break down after time and could be grounding out, or arcing between themselves causing a misfire.
  • Jul 05, 2012 | Cars & Trucks

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    2003 pontiac grand am error code p0300 and p0340 they said it dont have a cam position sensor


    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.

    Symptoms may include:
    the engine may be harder to start
    the engine may stumble / stumble, and/or hesitate
    other symptoms may also be present

    A code P0300 may mean that one or more of the following has happened:
    Faulty spark plugs or wires
    Faulty coil (pack)
    Faulty oxygen sensor(s)
    Faulty fuel injector(s)
    Burned exhaust valve
    Faulty catalytic converter(s)
    Stuck/blocked EGR valve / passages
    Faulty camshaft position sensor
    Defective computer


    DTC P0340 - Camshaft Position Sensor Circuit Malfunction
    This fault code indicates that a problem was detected in the camshaft position sensor circuit. Since it says circuit, that means the problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM. Don't just replace the CPS (camshaft position sensor) and think that will definitely fix it.

    Symptoms can include:
    Hard starting or no start
    Rough running / misfiring
    Loss of engine power

    A code P0340 could mean one or more of the following has happened:
    a wire or connector in the circuit could be grounded/shorted/broken
    the camshaft position sensor may have failed
    the PCM may have failed
    there exists an open circuit
    the crankshaft position sensor may have failed


    If need additional details, feel free to contact us in the fault code links. Hope this helps.

    Also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

    Thank you for using Fixya, and have a nice day.

    Nov 17, 2011 | 2003 Pontiac Grand Am

    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.

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    P0300 Diagnostic Code - 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.

    Symptoms may include:
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    * the engine may stumble / stumble, and/or hesitate
    * other symptoms may also be present

    Causes: A code P0300 may mean that one or more of the following has happened:
    * Faulty spark plugs or wires
    * Faulty coil (pack)
    * Faulty oxygen sensor(s)
    * Faulty fuel injector(s)
    * Burned exhaust valve
    * Faulty catalytic converter(s)
    * Stuck/blocked EGR valve / passages
    * Faulty camshaft position sensor
    * Defective computer

    Possible Solutions:
    - If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
    - If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

    Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.


    Hope helps, and keep us updated.

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