Question about 2005 Hummer H2

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My H2 Hummer had a computet code P003 misfire on cylinder 3.I switched the spark plug wires around now Im getting a computer code P001 multiple misfires

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  • Harold Washington
    Harold Washington Jan 20, 2013

    where can I find the engine control fuse so I can check it

  • Harold Washington
    Harold Washington Jan 20, 2013

    where can I find the engine control fuse so I can check it

  • eric allen
    eric allen Jan 23, 2013

    15 amp, location # 22. May not solve your problem, but helped my friend and me in the past.

  • Harold Washington
    Harold Washington Jan 26, 2013

    ok thanx

  • Harold Washington
    Harold Washington Jan 26, 2013

    Ok I found and fixed the problem, I had to get a valve job, had a hole in one of my valves..

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  • Hummer Master
  • 660 Answers

Check engine control fuse and then switch the coil packs around again. Rescan, and see what you get. Then switch to different coils again and rescan.
Mine was a combination of a blown engine control fuse and one bad coil.
My friend had the same, but it was 2 bad plugs and one bad coil.

Posted on Jan 20, 2013

6 Suggested Answers

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Posted on Jan 02, 2017

melvi_99
  • 387 Answers

SOURCE: how much will it cost to fix cylinder 2 misfire?

i don't know how match the cost, but it will he you, first change the position of the ignition coil to another coil also the spark plug, read the misfire code is it P032 or replace the code, if on cylinder 2 again appear the misfire check the compression, if ok go to electrical and check wires go and from to cylinder two coil to pcm, check the ground on #2 coil, if all this ok, see the difference reading by multi tester to coil reference if all good, reprogram your pcm, or replace if necessary

Posted on Aug 06, 2010

abdoush
  • 12 Answers

SOURCE: H2 HUMMER MAXIMUM SPEED 80KM/H CANT GO BEYOND

check the fuel bomb.

Posted on Sep 09, 2009

  • 462 Answers

SOURCE: engine system too lean (bank 1 , bank 2 )

Usualy this happens when you have vacuum leak after air flow meter , bad flow meter or temperature sensor.Actually for this problem I would take car to mechanic shop.

Posted on Apr 18, 2010

  • 1 Answer

SOURCE: my H3 Hummer has a fault code of P0017 And P0300

I have 08 H3 3.7 and alternator drop the charge ! start 14.0V and after 5 minutes gos to 12.3 V

Posted on Jun 18, 2010

rickyrt441
  • 4399 Answers

SOURCE: 2003 h2 misfires and engine hesistates then shuts

Did this start when after you changed them?

Posted on Feb 27, 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
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    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.
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    Engine cranks but wont start has an obd p 300 &p304 help me


    P0300 Random/Multiple Cylinder Misfire Detected, the 304 is for cylinder number 4 any of these could be wrong 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

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    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.

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    2004 Acura MDX 3.5 130,000 miles multiple missfire how do i fix ?


    Hi, multiple cylinder misfire, is when the engine cylinders do not fire in the correct order, and do not do it constantly. There is no particular pattern to it. My experience with this condition is that it is usually caused by a faulty ignition coil that is beginning to burn out. It could also be bad wires pluds rotor or cap

    Causes Include.
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    • 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 Solution:
    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.
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    Hi i have dodge neon 2004 the problem is apear check engie on and receive code p003 . tugging the car at any speed, i already replace spark plug but after 2 week start whit the same problem,


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