P0300 on HYUNDAI SONATA — Random/Multiple Cylinder Misfire Detected

Q: "What does P0300 mean on a HYUNDAI SONATA?"

"P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 3 HYUNDAI SONATA owners have reported this to NHTSA."

Q: "What are the most common causes of P0300 on HYUNDAI SONATA?"

"Based on 3 NHTSA reports, the most commonly cited components are: Fuel/Propulsion System, Power Train,Unknown Or Other,Engine, Engine. These percentages are based on the component field in owner complaints."

Q: "Is P0300 serious on my HYUNDAI SONATA?"

"Of 3 NHTSA reports for this code on HYUNDAI SONATA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my HYUNDAI SONATA shows P0300?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0300 Means on Your HYUNDAI SONATA

P0300 is a diagnostic trouble code indicating: Random/Multiple Cylinder Misfire Detected. This code relates to the ignition system system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

3 HYUNDAI SONATA owners have reported this issue to NHTSA across model years 2014-2016. Most reports come from the 2014, 2015 model years.

Real HYUNDAI SONATA Owner Reports

Source: NHTSA Complaints Database

"Check engine light came on with a odb code of P0300. engine started to run rough and mileage dropped substantially. Upon arrival to my home due to safety issues I turned off car and and let it cool."

— 2014 HYUNDAI SONATA owner · FUEL/PROPULSION SYSTEM · Filed 01/20/2025

"Our 2015 Sonata has experiencing Engine failure several times due to excessive and irregular oil consumption."

— 2015 HYUNDAI SONATA owner · POWER TRAIN,UNKNOWN OR OTHER,ENGINE · Filed 01/22/2025

"I changed out every cylinder, axel, within 6 months and now on March 22, 2023, they said I needed a new engine. P0300, P0303 MISFIRE. They said the car misfired. I thought that's why they changed all the cylinders. WHY DID THIS HAPPEN? My car has been parked in the garage."

— 2016 HYUNDAI SONATA owner · ENGINE · Filed 03/09/2023

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

1

'14

1

'15

1

'16

Common Causes on HYUNDAI SONATA

Based on NHTSA complaint component analysis for this vehicle.

FUEL/PROPULSION SYSTEM 33.3%

POWER TRAIN,UNKNOWN or OTHER,ENGINE 33.3%

ENGINE 33.3%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0300 mean on a HYUNDAI SONATA? ▾

P0300 indicates: Random/Multiple Cylinder Misfire Detected. This is a ignition system code. 3 HYUNDAI SONATA owners have reported this to NHTSA.

What are the most common causes of P0300 on HYUNDAI SONATA? ▾

Based on 3 NHTSA reports, the most commonly cited components are: Fuel/Propulsion System, Power Train,Unknown Or Other,Engine, Engine. These percentages are based on the component field in owner complaints.

Is P0300 serious on my HYUNDAI SONATA? ▾

Of 3 NHTSA reports for this code on HYUNDAI SONATA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my HYUNDAI SONATA shows P0300? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.