The error code in Nissan vehicles (typically the Kicks, Versa, or Sentra) indicates a Grille Shutter Performance issue [1, 2]. Specifically, the engine control module (ECM) has detected that the Active Grille Shutter (AGS) —a system that opens and closes slats in the front bumper to manage aerodynamics and engine cooling—is not operating within its expected parameters [2, 3]. What is the Active Grille Shutter System?
While "P155" codes are often mistaken for standard O2 sensor codes (like P0155), the full 7-character manufacturer-specific code points toward the active aero components. Understanding the Grille Shutter System The Component nissan p155b00