Question about 2000 Pontiac Grand Am GT

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P0300 CODE ON 2001 PONTIAC GRAND AM

The engine has a misfire and when I put the code reader on, the above was indicated. When I remove plug wires the engine misfire does not change, no matter which wire is removed.

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  • Anonymous Mar 14, 2014

    just put in a 2001 motor and the engine light came on and is staying on.. codes says multiple mis fires

  • Anonymous Mar 20, 2014

    Performed DTC scan and retrieved DTC P0300-plugs and wires have been changed.Reading current data and cyl. 3 misfiring at idle.When engine rpm goes over 1500 misfire counter back to zero.Swapped over coils plugs wires and injectors to see if the misfire would follow to swapped cylinder and no change.Have not done compression test yet.

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Well, the code simply means that the engine has... a random misfire. As to why, that's going to take some work. Is it fuel, timing, compression, or electrical? I'd start with a compression test. Then throw a timing light on it, check for play on the valve train, run some fuel cleaner through the tank, and check your electrical connections. Hopefully, something will pop up. Good luck!

Posted on Nov 23, 2008

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Fiat seicento sx 2001 mil light comes on intermittently.code reader gives error p0300 but car seems fine. What could be wrong


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it could be simple moisture in the distributor cap, wiring connections
It could be a problem ECM unit
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1998 Pontiac grand Prix gt has motor vibration when started replaced plugs, maf code is po300 what could this be


Melissa, P0300 Random Cylinder Misfire, could be caused by bad plug wires,bad /weak coil, Ign. module,clogged bad fuel injectors,etc. will probably have to take it to a good tech to diagnose and est. repair. Check the attached links more info,instruction and guides, Good luck
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2001 grand Cherokee. Code P0300


po300 is a random misfire, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. If it was a po302 this means its #2 cylinder thats misfiring,ETC, But po300 could be any one of the cylinders. check plugs, wires, fuel injectors, Etc. Good-Day!

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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

My 2000 grand am has multiple miss fires


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:
* 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, and keep us updated.

Jan 05, 2011 | 2000 Pontiac Grand Am GT

1 Answer

Loss of power, stalling at stops and slows, codes P0300, P0107, P0105 and P0105. Will stall but when put into nuetral will start right up.


The symptoms and the codes you've given would indicate to me that you have a vacuum leak. Look for a loose a throttle body, loose, missing or damaged hoses, loose or missing intake manifold bolts or any other opening in the intake manifold.
P0105 - Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction
P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
P0300 - Random/Multiple Cylinder Misfire Detected

Jun 17, 2010 | 2001 Pontiac Grand Am SE

1 Answer

Cylinder 1 misfire


Misfire codes (including P0301 (THIS WOULD BE YOUR CODE), P0302, P0303, P0304, P0305, P0306, P0307 & P0308) indicate that there is a misfire in a cylinder, the last number indicates which cylinder has the problem. If something is causing a miss in random cylinders or is affecting all of them, a P0300 misfire code will be stored in the car's computer. It's always smart to begin with the basics. Also consider the mileage and service history when diagnosing a misfire. Higher mile vehicles are more inclined to have mechanical issues with the engines, like low compression from worn valves or rings etc. Any accompanying codes should also be considered in case they may be related. If the spark plugs are worn (excessive gap) or the car is past due for a tune up, it may be smart to go ahead and start with spark plugs and spark plug wires and go from there.
The most common misfire causes on the cars I've worked on have been:
  1. Spark plugs
  2. Spark plug wires
  3. Ignition coil
  4. Fuel injector
  5. Wiring to fuel injector
  6. Timing Belt (IF EQUIPPED)
  7. Vacuum leak or stuck open EGR
  8. Contaminated fuel or bad fuel pump
  9. Weak compression
  10. Blown head gasket

Obviously there are many different types of cars, so a service manual for the specific one that you are working on may be required to help pinpoint the misfire you're looking for, but hopefully this will direct you to some of the most common causes of misfires in cars of today.
When diagnosing a SES light, it's best to start with a quick scan with a code reader. If checking the engine's mechanical integrity specialty tools, like a compression tester, an exhaust back pressure gage or cylinder leak down tester may be needed.

May 22, 2010 | 2001 Pontiac Grand Am SE

2 Answers

2001 Pontiac grand am misfiring. replaced plugs,


mine just had that problem...its your M.A.P...I went to the shop to get my check engine light to go off and it said my MAP was bad so i had it fixed and I dont know what they did but after they put it on my car started misfiring...I just left mine unplugged and it runs like new...but if i plug it up my car misfires again...

Jan 31, 2010 | 2000 Pontiac Grand Am GT

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