P0300 SATURN - Cylinder Misfire Detected Random Cylinders
Faulty spark plug (s)
Faulty ignition coil (s)
Clogged or faulty fuel injector (s)
Intake air leak
Fuel injectors harness is open or shorted
Fuel Injectors circuit poor electrical connection
Ignition coils harness is open or shorted
Ignition coils circuit poor electrical connection
Insufficient cylinders compression
Incorrect fuel pressure
The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes".
There is a factory service bulletin for the following Saturn models:
2000-2008 Saturn Models2000-2008 Saturn Factory Service Bulletin OBDII Code P0300
When is the code detected?
The control module monitors the crankshaft speed and has detected a misfire condition
Engine Light ON (or Service Engine Soon Warning Light)
Lack/loss of power
P0300 Saturn Description
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP
) sensor signal to vary, the Engine Control Module (ECM
) can determine that a misfire is occurring.