A P0302 code on your 2018 Chevrolet Silverado indicates the PCM detected misfires in cylinder 2. The 2018 was the final year of the K2 generation before the 2019 redesign, using proven V8 engines.
2018 Silverado V8 Engines
The 2018 Silverado primarily offered the 4.3L V6, 5.3L V8, and 6.2L V8. The V8 engines are most common and share similar cylinder layouts—cylinder 2 is on the passenger bank, second from front.
Age-Related Considerations
At 6+ years old, the 2018 Silverado may experience misfire from wear items. Common causes include worn spark plugs, degraded ignition coils, AFM (Active Fuel Management) issues on equipped engines, and fuel injector problems.
AFM System Concerns
The 5.3L and 6.2L V8s with AFM (cylinder deactivation) can develop lifter problems that cause misfires. While P0302 specifically indicates cylinder 2, AFM-related issues may be the underlying cause.
Diagnostic Strategy
Start with basic ignition testing—coil swap and spark plug inspection. If ignition components check out and the truck has AFM, investigate lifter condition.