Question about Pontiac Bonneville

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My 2003 Pontiac Bonneville has a fault code of p0300 random cylindar misfire. How would you go about fixing it?

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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 (remember to rate this).

Posted on Oct 11, 2010

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2003 bonneville has misfire 3 & 6. replaced coil packs, plugs, wires, ignition control module, cat, down stream 02 sensor. still has 3 & 6 misfire and bank 1 and 2 02 sensor low volts. upper intake was replaced due to hole right below the wiring. did not see any burnt wires. what else could it be?

Posted on Apr 09, 2014

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Starts up but runs rough, exhaust smells, and when you give it gas it wants to shut off.


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How do i fix my Mercury Villager 2002 with random misfire?


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Dec 17, 2015 | 2002 Mercury Villager

2 Answers

Starts and runs great. But under load after converter locks po300 code come up


Worked on these for years. Get an ohm meter and check each coil. I would start there. If a resistance is different from the other two then that could be it. If you see rust that is a bad wire and coil too.

Mar 23, 2015 | 1998 Pontiac Bonneville

2 Answers

How do I fix a trouble code for Nissan Murano P0300?


DTC P0300: Random multiple misfire detected. Probable cause:
1. Vacuum leaks, damaged hoses and/or incorrect routing
2. Fuel contamination
3. Ignition system fault. Check ignition module, coil, spark plugs and wires
4. Fuel system problem

Jan 29, 2015 | 2003 Nissan Murano

2 Answers

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

Car wont accelerate properly, it hesitates between 2200 and 3000 rpm. I have a p0300 and p0131 error codes.


Code P0131 is your Oxygen sensor that needs to be replaced. This could cause the other code which is P0300-Random Multiple Misfire although this is usually caused by one of two other sensors. Try replacing the Oxygen sensor first and reset the computer and see if you still get the P0300 code afterward. If you do then you will have to have the Crank Position sensor and the Cam Position sensor tested. Now, being a 1995 the P0300 code could be caused by the timing belt if it is worn and about to go out but you need to address the O2 Sensor issue first then see if the other code comes up again as it is common in that year for the O2 Sensor to fault and have a second or third code thrown at the same time that is essentially a ghost code as nothing is wrong in that area.

Aug 26, 2011 | 1995 Pontiac Bonneville

2 Answers

P0300 diagnostic code read on my car today, but didnt specify where it was coming from, the machine that reads the codes didnt feed from my car to the computer


I have a 2000 Oldsmobile Alera that has a diagnostic code p0300 random misfire, runs very bad change- ignition coils- spark plugs and boots for plugs. change catalytic converter, and fuel pressure is 50 to 60 lb. And my car still runs the same, HELP HELP HELP!!!!!!!!!!

Dec 23, 2009 | 1998 Oldsmobile Cutlass

1 Answer

Random engine misfiring- fault code P0300- 1999 cutlass


Could be coil pack(s), fuel injectors, etc. Rather than retype it, just check out this great article on P0300 random misfire - http://www.obd-codes.com/p0300

Dec 15, 2008 | 1999 Chevrolet Cavalier

2 Answers

2000 bonneville


P0300 is a random misfire code, if you are not mechanically inclined the first thing i would do if you havent done so in the past year or more, is change the plugs and wires, a random misfire code can be caused by worn plugs and/or wires not firing properly. let me know if that fixes it.

Jul 03, 2008 | 2000 Pontiac Bonneville

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