P0300 HYUNDAI - Random/Multiple Cylinder Misfire Detected
P0300 HYUNDAI Possible Causes
- 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
First diagnose P0300 HYUNDAI code
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
P0300 HYUNDAI 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
Cost of diagnosing the P0300 HYUNDAI code
Labor: 1.0The cost of diagnosing the P0300 HYUNDAI code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
When is the P0300 HYUNDAI code detected?The control module monitors the crankshaft speed and has detected a misfire condition
P0300 HYUNDAI Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0300 HYUNDAI MeaningWhen 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.
P0300 HYUNDAI More InformationNeed more information on how to fix the P0300 HYUNDAI code?
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