P0301 Hyundai Tucson
Cylinder 1 Misfire Detected · Powertrain Code · High · Repair: Easy
What is P0301?
Misfire detected in cylinder 1. Typically caused by a worn spark plug, bad ignition coil, faulty fuel injector, or low compression in that cylinder.
When the Hyundai Tucson triggers code P0301 (cylinder 1 misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Hyundai Tucson.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Hyundai Tucson.
Common Causes on Hyundai Tucson
- Ignition coil failure on cylinder 1 on 2.5L Smartstream or 2.5T
- GDI injector carbon buildup causing misfire on cylinder 1
- Spark plug fouled from oil consumption on Theta II or Smartstream engines
- Intake valve carbon deposits restricting airflow to cylinder 1
Symptoms
- Rough idle with noticeable engine vibration
- Engine shaking or vibration especially at idle
- Loss of power during acceleration
- Check engine light flashing (indicating catalytic converter damage risk)
- Poor fuel economy from unburned fuel
- Unburned fuel smell from exhaust
Notes for Hyundai Tucson
Tucson/Sportage GDI engines benefit from intake valve cleaning every 60K miles.