Hi there:
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
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 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, have a nice day.
Same issue on my 2005 canyon. Already replaced the plugs after replacing the VVT on it. I'm guessing next would be my coil packs. They were looking a little burnt.
SOURCE: IDLE CONTROL SYSTEM CODE PO506
You need the idle control solenoid replaced. It is the dealer that will fix it for you.
Good luck.
Testimonial: "THANKS FOR YOUR QUICK RESPONSE / WALLY"
SOURCE: 2007 GMC Canyon
they have so many electrical component there nothing wrong with it manly all car today that dont run daily do that park a mercedes for 2 weeks the same will hapen bmw ect charge our battery and drive it thanks for using fixya pierre
SOURCE: Vehicle start shaking and died. Has a trouble code P0300
Error code P0300 means that you are having multiple/random cylinder misfires. I would start with changing all of the spark plugs and see if that will fix it. You will have to have the code reset at an auto parts store. If that doesn't work let me know and we can progress down the line.
SOURCE: p0300 truck idling for a while this code come up 2005 gmc canyon
That's a misfire code, does the vehicle feel like its running rough? If not it may just be a bad batch of fuel or even time for a tune up depending on mileage.
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