Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are commonly caused by multi-cylinder misfiring. If no leaks are found the next step is to replace the spark plugs. If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes".
There is a factory service bulletin for the following Hyundai models:
Hyundai Accent (MC)
Hyundai 2003-2006 SULEV Elantra (XD)
Hyundai 2004-2008 Tiburon 2.0L (GK)
Hyundai Tucson 2.0L (JM)
Hyundai Elantra (HD)
Hyundai Elantra Touring (FD)
Hyundai Genesis Coupe (BK)
Hyundai Sonata (NF)
Hyundai Santa Fe
Hyundai Sonata (NF)
Hyundai Santa Fe (CM)
Hyundai Azera (TG)
Hyundai Veracruz (EN)
Hyundai Entourage (EP),
Hyundai Genesis Coupe (BK)
Hyundai 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.
Factory Service Bulletin: Hyundai Constant Variable Valve Timing Oil Control Valve Inspection OBDII Code P0300
To diagnose the P0300 Hyundai code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
The control module monitors the crankshaft speed and has detected a misfire condition
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.
Need more information on how to fix the P0300 Hyundai code? Get Access to Factory Service Manuals
Get the P0300 Hyundai code diagnosed by a professional: Find a repair shop in your area
Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P0300 Hyundai code? Have you replaced any parts?
Any information is appreciated. Thanks