Traditional gasoline car fault

Kia Sorento LX 3.5 P0477 Fault Code: Exhaust Pressure Control Valve Issue

Kia Sorento LX 3.5 - Diagnosing P0477 Fault Code (Exhaust Pressure Control Valve Low). What does this error code mean and how can it be resolved?

Kia Sorento LX 3.5 | P0477