The P0302 trouble code on your 2020 Hyundai Sonata indicates that cylinder 2 is experiencing misfires detected by the engine control module. The eighth-generation Sonata launched in 2020 offers multiple powertrains: the 2.5L Smartstream, 1.6L turbocharged, and 2.0L hybrid. Each engine has specific diagnostic considerations for misfire conditions.
Powertrain Options
All Sonata engines are inline-4 configurations with cylinder 2 second from the timing end. The 2.5L Smartstream features Continuously Variable Valve Duration (CVVD) technology. The 1.6L turbo uses direct injection for performance. The hybrid combines a 2.0L GDI engine with electric motor assistance.
2.5L Smartstream Specifics
The 2.5L features advanced CVVD valve timing that optimizes efficiency. While generally reliable, CVVD system issues could theoretically affect cylinder-specific operation. Standard ignition and fuel system issues remain common misfire causes.
Turbo and Hybrid Considerations
The 1.6L turbo adds boost pressure variables to diagnosis. Direct injection can lead to carbon buildup on intake valves. The hybrid system operates the 2.0L GDI engine intermittently, which may affect spark plug condition over time.
Symptom Identification
Four-cylinder misfires produce noticeable symptoms: rough idle, hesitation, and vibration. The refined Sonata's smooth driving character suffers when cylinder 2 doesn't contribute properly. Check engine light illumination accompanies the misfire condition.
Diagnostic and Repair Approach
Identify your powertrain type before diagnosis. Scan for all codes including system-specific codes. Inspect ignition components on cylinder 2. Test fuel system operation appropriate to injection type. Turbo models require boost system evaluation. Standard maintenance often resolves misfire conditions.