The 2021 Genesis GV80's 3.5T twin-turbo V6 delivers 375 horsepower of refined power. When P0301 appears indicating cylinder 1 misfire, this sophisticated engine needs focused diagnosis to identify the failing component in this specific cylinder.
Understanding P0301 in the 3.5T
Code P0301 indicates cylinder 1 is misfiring—combustion isn't occurring properly in that specific cylinder. Unlike the broader P0300, this code points to a localized issue, significantly narrowing the diagnostic search.
Cylinder 1 Location
In the 3.5L twin-turbo V6, cylinder 1 is typically at the front of the passenger-side bank. Understanding the location helps when inspecting components and performing swap tests.
Symptoms of Cylinder 1 Misfire
- Rhythmic roughness at idle
- Check engine light on steady or flashing
- Noticeable vibration at stops
- Reduced power during acceleration
- Possible fuel smell from unburned mixture
Primary Causes
Ignition Coil Failure
The individual coil-on-plug for cylinder 1 can fail from heat stress, age, or manufacturing defect.
Spark Plug Issues
The twin-turbo environment stresses spark plugs. Cylinder 1's plug may have worn or developed a defect.
Fuel Injector Problems
Direct injection into cylinder 1 can be affected by deposits, electrical faults, or mechanical issues.
Compression Loss
Less common on a 2021 model, but valve or ring issues specifically affecting cylinder 1 can cause isolated misfires.
The Coil Swap Test
Swap the cylinder 1 coil with another cylinder. Clear codes and drive. If the misfire moves with the coil, it's confirmed bad. This simple test prevents unnecessary parts replacement.
Repair Costs
| Repair | Parts | Labor | Total |
|---|---|---|---|
| Ignition coil (single) | $50-$120 | $100-$175 | $150-$295 |
| Spark plug (single) | $15-$35 | $100-$175 | $115-$210 |
| All spark plugs (6) | $90-$210 | $200-$350 | $290-$560 |
| Fuel injector (single) | $150-$300 | $200-$350 | $350-$650 |