The P0300 Engine Code Your Ultimate Guide to Diagnosis and Repair

P0300 is a DTC (diagnostic trouble code) which is logged by your Volvo's ECM (car's brain or computer), that then causes your check engine light to illuminate. 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 ... DTC P0300 is for random/multiple misfires. I would make sure you've got good fuel and have the spark plugs inspected. I had been only making short trips for a while and so I took a couple of longer trips the past week to let the engine run a bit at normal op ... The engine light is on with 4 fault codes p0300, p0301, p0302, p0303 misfire the car will barely rev up and driving it along it is hard to get above 30 mph. That code indicates the engine is misfiring. Is the check engine light blinking or flashing, or is it solid? When did you first notice it? This diagnostic trouble code (DTC) indicates that your car's computer has detected an engine misfire that's random and/or appearing on multiple cylinders. Any opinions as to why I am getting this check engine light code especially after I have already changed out my spark plugs this past summer? The P0300 code is very generic and says that the engine has detected a misfire but doesn't give enough information on which cylinder or if it happened once or ... that code is just what it says. random misfire. the computer is not pinning it down to a certain cylinder, it could be anything. state of tune, ...