P0300 HYUNDAI - Random/Multiple Cylinder Misfire Detected
Tech notesThe 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 Hyundai models:
2003-2006 SULEV Elantra (XD)
2004-2008 Tiburon 2.0L (GK)
Tucson 2.0L (JM)
Elantra Touring (FD)
Genesis Coupe (BK)
Santa Fe (CM)
Genesis Coupe (BK)
Genesis Sedan (BH)Genesis Sedan (BH)
The bulletin provides information on how to inspect and diagnose problems related to the Oil Control Valve (OCV) used in Constant Variable Valve Timing (CVVT), if at any time the OCV is suspected as the caused of rough idling, poor acceleration, camshaft timing misalignment-related trouble codes, misfire-related trouble codes.
Bulletin: Hyundai Constant Variable Valve Timing Oil Control Valve Inspection
When is the code detected?The control module monitors the crankshaft speed and has detected a misfire condition
P0300 Hyundai DescriptionWhen 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.
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