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P0300 KIA Code - Random/Multiple Cylinder Misfire Detected

- Code Popularity: 69,482 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0300 KIA?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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
⚠ Does your KIA have Safety Recalls? → Check here

How to Fix the DTC P0300 KIA?

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.

Code Tech Notes

There is a factory service bulletin for the following KIA models:

Kia Rio (JB)
Kia Soul (AM)
Kia Optima (MG)
Kia Rondo (UN)
Kia Forte (TD)
Kia Spectra (LD)
Kia Sportage (KM)
Kia Optima (MG)
Kia Sedona (VQ)
Kia Amanti (GH)
Kia Borrego (HM)
Kia Sedona (VQ)
Kia Sorento (BL)
Kia Borrego (HM)

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: Kia Constant Variable Valve Timing Oil Control Valve Inspection OBDII Code P0300

Search for P0300 KIA Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0300 KIA 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.

When is the Code Detected?

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

What are Code Possible Symptoms?

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

Code P0300 KIA 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.

OBDII Code P0300 KIA - Random/Multiple Cylinder Misfire Detected - AutoCodes.com
P0300 KIA Code - Random/Multiple Cylinder Misfire Detected

Need More Information on the Code?

Need more information on how to fix the P0300 KIA code? Get Access to Factory Service Manuals

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Code P0300 KIA comments

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