Engine-Codes - Hyundai - P0300 HYUNDAI

P0300 HYUNDAI - Random/Multiple Cylinder Misfire Detected

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

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

How is the P0300 HYUNDAI code repair?

Start by checking 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 connector's pins.

Tech Notes

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

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What is the cost to diagnose the P0300 HYUNDAI code

Labor: 1.0

The cost to diagnose 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 code detected?

The control module monitors the crankshaft speed and has detected a misfire condition

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/loss of power
  • Hard start
  • Engine hesitation

P0300 HYUNDAI Meaning

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.

More Information

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