Question about 2003 Chevrolet TrailBlazer

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03 chevy trailblazer, hooked up a code scanner and shows multiple random misfires doesn't give specific cylinder. p0300 code. I changed the spark plugs. no help.

Don't really want to replace all the coil packs being that they are around 50 bucks each. What else can I check before throwing more money into it.

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Pull the coil plugs when running. One at a time. If the engine gets worse the coil is good. No difference. Most likely the coil is bad. To check it again, swap it with another. Pull the plug on the suspected bad one. If it gets worse, look to wiring at the one that was no deference. Check for power to the plug.

Posted on Dec 23, 2016

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  • Chevrolet Master
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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

    1 Answer

    Code po300


    Hi Joyce:
    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

    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.

    Dec 15, 2011 | 2002 Pontiac Firebird

    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

    1 Answer

    PO300 code. 3.4L 98 Chevy blazer. (random misfire). this happens at high speeds 16000 rpms and higher. after the engine is warm it is more noticeable and misses at idling speeds. if i take it higher than...


    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. it could be any of the following 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
    • also
    • 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.

    Jun 08, 2011 | Chevrolet Blazer Cars & Trucks

    2 Answers

    P0300


    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.

    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

    May 04, 2011 | Mitsubishi Eclipse Spyder Cars & Trucks

    1 Answer

    Code reads "random/multiple cylinder misfire


    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

    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.

    Apr 25, 2011 | 2000 Buick LeSabre

    2 Answers

    My H3 keeps giving me a code for multiple cylinder misfire. What's up with this?


    Check for some 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

    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.

    Keep us updated.

    Apr 24, 2011 | 2006 Hummer H3

    1 Answer

    I Have a Chevy 2007 HHR engine 2.4 Lit. and the scaner show code P0300,I changed spark plus and erase computer, but after a few miles the code come back again. This car has about 62000 miles. Can you held...


    P0300....Random/Multiple Cylinder Misfire Detected

    i would suspect either the coil pack or the leads ,also make sure spark plugs are set to 25 th as too wider gap could cause this problem as well

    Mar 01, 2011 | Chevrolet HHR Cars & Trucks

    2 Answers

    03 chevy express 6.0 misfire code po300, rough idle, sputters and stalls.


    P0300 Diagnostic Code - Random Misfire
    Technical description:--
    Random/Multiple Cylinder Misfire Detected:---
    Exactly what does this code means:--
    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:--
    the engine may be harder to start.the engine may stumble / stumble, and/or hesitate.
    other symptoms may also be present…There may be rough idle, sputters and stalls and jerks.
    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 for this error problem:--
    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 vehicle, 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 un-metered air getting past the airflow sensor, or an EGR valve that is stuck open.
    Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

    Aug 10, 2010 | 2005 Chevrolet Express

    1 Answer

    Engine light comes on - Code shows P0300 and then


    OBD II 300 Random/Multiple Cylinder Misfire Detected

    When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.

    Possible Causes:

    Fuel injectors, related wiring, sensors and computer issues
    Running out of gas, or poor fuel quality
    Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
    Incorrect Fuel Pressure
    EGR system concerns: leaking EGR valve or restricted ports
    Base engine concerns: low compression, valve train problems and timing issues
    Ignition system concerns including, but not limited to:
    Faulty spark plugs
    Faulty coil or related wiring
    Ignition module or related wiring issues
    Ignition related sensor faults or wiring issues

    Apr 04, 2009 | 1996 Dodge Ram 1500 Club Cab

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