The engine control module has detected a misfire specifically in cylinder 11. This code typically appears on V6, V8, or larger engines where cylinder 11 must be individually diagnosed.
Find certified mechanics near you who can diagnose and repair P0311.
For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.