P0303 on HYUNDAI TUCSON — Cylinder 3 Misfire Detected

Q: "What does P0303 mean on a HYUNDAI TUCSON?"

"P0303 indicates: Cylinder 3 Misfire Detected. This is a ignition system code. 5 HYUNDAI TUCSON owners have reported this to NHTSA."

Q: "What are the most common causes of P0303 on HYUNDAI TUCSON?"

"Based on 5 NHTSA reports, the most commonly cited components are: Fuel/Propulsion System, Engine, Engine,Fuel/Propulsion System. These percentages are based on the component field in owner complaints."

Q: "Is P0303 serious on my HYUNDAI TUCSON?"

"Of 5 NHTSA reports for this code on HYUNDAI TUCSON, 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 TUCSON shows P0303?"

"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 P0303 Means on Your HYUNDAI TUCSON

P0303 is a diagnostic trouble code indicating: Cylinder 3 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.

5 HYUNDAI TUCSON owners have reported this issue to NHTSA across model years 2017-2023. Most reports come from the 2022, 2017 model years.

Real HYUNDAI TUCSON Owner Reports

Source: NHTSA Complaints Database

"My 2017 Hyundai Tucson 1.6 liter is experiencing severe engine issues that closely mirror those subject to recent class action lawsuits. The engine exhibits excessive oil consumption. I have experienced a sudden loss of power on roadways in traffic as well as on the highway."

— 2017 HYUNDAI TUCSON owner · ENGINE · Filed 07/14/2025

"2022 Hyundai Tucson with repeated check engine light and vehicle losing power. Vehicle losing power and inability to exceed speeds of 15 mph with vehicle shaking, knocking, and pedals shaking. No warning that this was going to occur until vehicle becomes unsafe to drive."

— 2022 HYUNDAI TUCSON owner · ENGINE,FUEL/PROPULSION SYSTEM · Filed 08/09/2024

"Car lost ability to accelerate and was shuddering for the second time. My personal code reader pulls up codes P0191 and P0303. Engine misfire. Second time since June28,2023. Bought the Hyundai Tucson brand new in December of 2021."

— 2022 HYUNDAI TUCSON owner · POWER TRAIN,ENGINE · Filed 10/30/2023

"Without any warning indicator my 2022 Hyundai Tucson (11850 miles on car) stalled on the road. I received an alert on my phone from Hyundai, after the car shut down that there was a system failure. Car was towed to Pugi Hyundai dealership (where I purchased in new in Jan."

— 2022 HYUNDAI TUCSON owner · FUEL/PROPULSION SYSTEM · Filed 07/08/2023

"(1) [XXX] (14,568 mi): The vehicle had been running normally. My wife was about to switch lanes at an intersection when the vehicle started to shake and vibrate. The entire dashboard lit up and the vehicle quickly died. She tried restarting it and the engine wouldn’t turn over."

— 2023 HYUNDAI TUCSON owner · FUEL/PROPULSION SYSTEM · Filed 11/19/2024

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

📊 Complaint Trend by Model Year

1

'17

3

'22

1

'23

Common Causes on HYUNDAI TUCSON

Based on NHTSA complaint component analysis for this vehicle.

FUEL/PROPULSION SYSTEM 40%

ENGINE 20%

ENGINE,FUEL/PROPULSION SYSTEM 20%

POWER TRAIN,ENGINE 20%

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 P0303 mean on a HYUNDAI TUCSON? ▾

P0303 indicates: Cylinder 3 Misfire Detected. This is a ignition system code. 5 HYUNDAI TUCSON owners have reported this to NHTSA.

What are the most common causes of P0303 on HYUNDAI TUCSON? ▾

Based on 5 NHTSA reports, the most commonly cited components are: Fuel/Propulsion System, Engine, Engine,Fuel/Propulsion System. These percentages are based on the component field in owner complaints.

Is P0303 serious on my HYUNDAI TUCSON? ▾

Of 5 NHTSA reports for this code on HYUNDAI TUCSON, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my HYUNDAI TUCSON shows P0303? ▾

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.