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P0300 OBD-II Trouble Code: Random/Multiple Cylinder Misfire Detected
P0300 code definition Random/multiple cylinder misfire detected What the P0300 code means Most vehicles will have 4-6 cylinders. Each cylinder will fire a spark plug, one after another, in a smooth...

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Car hesitating on acceleration.
Thanks for writing in about your Mazda 6. You need to make sure that the mass airflow sensor is not getting contaminated by an oil type air filter. If it is, replace the air filter with clean paper type one...
Code P300. Tried fixing with no success.
When you receive the OBD code P0300, it means your Buick LeSabre is experiencing a random misfire. This code is given because one or more of the engine’s cylinders are misfiring. While our first instinct is to think spark plugs,...
SES light on, car misfiring
Hello. When multiple codes are recorded, such as in your case, generally the first code is the one to look at. However, the FSM for your vehicle will state which code to start with diagnostics. The reason for this is...
Car misifires under load, P0300 code
Hello. The P0300 code refers to a detection of a misfire in one of the cylinders. If the car idles fine and only acts up during acceleration with this code coming up, then it is usually caused by a fuel...
Barely any power when I step on the gas pedal, any ideas?
Hello. From the symptoms you describe it would appear that your vehicle is experiencing an issue that is putting it into some sort of limp mode. Limp mode is activated when the computer detects an issue that could potentially damage...
Don't understand CEL Codes.
The codes P0300 through P0306 are for misfires of random cylinders or different cylinders. The second code P1456 is for the evaporative fuel tank system having a leak somewhere in the system. Since you are getting random misfires, then I...
Found out 1st cylinder in car has no compression....what are my options?
The first thing you have to do is confirm such a diagnosis by getting a second opinion. It is unusual for three cylinders to be perfectly normal and one to have "no" compression. Nevertheless, it is possible. A cylinder...
What is the major problem in my car
Hello. When you have this many codes you either have an issue with the voltage system in the vehicle being low due to a bad connection, a battery that is failing, or a faulty alternator. It can also be...
P300 reading, loss of power, and misfiring cylinder
Code P0300 indicates there is a random misfire which can be happening in one or more of the cylinders in your Nissan. If you have a specific cylinder misfiring there is usually another code along with the random misfire code,...
Still getting code P0300 after parts change
It sounds as though you have done an almost complete tune-up of the vehicle. However, there may be a few components left to check. A clogged fuel filter can restrict fuel volume causing a lean condition, and set random...
Car misfiring.
Having your code is a great asset in helping us narrow down the information on the issue your Isuzu Trooper is experiencing! When you notice random misfires in your vehicle, this means that the engine is detecting misfires in two...
Need to fix error codes
Greetings! The P0147 is an oxygen sensor heater circuit failure, while the P0300 is a random multiple misfire. It is unlikely that these are related, although misfires do have an effect on oxygen sensors. The heater on the oxygen sensor...
Car not getting enough fuel
P0300 is an engine code for multiple misfires. These are possible causes, vacuum leaks, damaged hoses or improper routing, fuel contamination, ignition system (ignition module, coil, spark plugs and wires,) or a fuel system issue. If there are specific codes...
Car shakes when idling
I know these vehicle symptoms all too well. If your GMC Yukon runs better after it has warmed up then it is likely that it is experiencing a vacuum leak in the intake manifold gaskets. It is not uncommon for...
Getting troubles codes P01217, P0300, and P0300P
It sounds like the vehicle is experiencing a few different problems that will probably need to be addressed separately. It sounds to me like there is probably an electrical short somewhere on the vehicle that is draining the battery. This...
Car idles and multiple trouble codes are triggered
Hi there. If this vehicle is having an idle concern, I have to ask if you may be having a stumble or stall issue when coming to a stop. If so, your vehicle may be covered under a special...
P0300 code, misfiring on a '06 Hmamer H3
Those things are notorious for having fuel injection problems. GM made them with cheap plastic and the fuel injection parts, so when they get to be older, after 10 years old, the plastic cracks, leaks, and gets multiple misfires. That's...
Random misfires
Hello. There are several possibilities that could explain why you are having this problem. One possibility is that you could have one or more faulty fuel injectors, or the fuel injector wiring is damaged. Another possibility is...
Engine Light/ Maintenance Required/ TCS Light on
All these codes point to engine misfires. You should pull the spark plug wires to see if oil is on the spark plug wires causing the misfire. You would need to replace the valve cover gaskets and spark plug tube...
Starting problem
At 180.000 miles, it could be just about anything. The P0161 and P0140 codes are oxygen sensor codes, and probably don't have anything to do with the starting issue, though you should have that investigated. The P0300 code however is...

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