P0301 on Hyundai Elantra
Cylinder 1 Misfire Detected
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Hyundai Elantra context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P0301.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P0301 Means on Your Hyundai Elantra
P0301 is a diagnostic trouble code indicating: Cylinder 1 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.
Real Hyundai Elantra Owner Reports
Source: NHTSA Complaints Database
"Confirmed the customer's complaint &found the engine didn't start. Inspected the ignition system & the air intake system, but found no concerns. Inspected the engine coolant level & condition & found the engine coolant level was fair."
"The Issue started back in December of 2023.The Engine failed while driving to Lake Worth, TX. Vehicle Information: Model is a 2017 Hyundai Elantra Limited 2.0 Engine, US Built. Mileage during the1st incident was at 100,125 miles and the VIN Number is [XXX] ."
"This is the second time my check engine light has come on while driving and car vibrating and shaking in the middle of heavy traffic and also idling at stop lights/signs. Why does this keep happening? The codes were registered P0301/P0302."
"One of the four ignition coils failed. Car started shaking originally at 60mph and continued to shake when stopped. Check engine light flashed on and off during the drive. Problem was reproduced and confirmed by the reading of the engine code (P0301 - Cylinder 1 Misfire Detected)."
"Sluggish, shaky and not acceleration engine light comes on intermediately. code came up p0301. changed spark plugs, sensor, inclined the catalytic converter two times. still the problem persists. took to hyundai dealership they said one of four coil packs was going out."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Hyundai Elantra
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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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.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.