It’s part of the evaporative emissions system (commonly referred to as “EVAP”) and reads pressure in the fuel system to detect evaporative leaks, such as a loose or faulty gas cap.

P1456 - EVAP Control System Leakage (EVAP Fuel Tank System) If your engine light illuminates and your car fails an emissions test, it could be experiencing an evaporative emission control system leak.

Some of those parts are well-known, like the engine, transmission, and brake system, while others, like the harmonic balancer and evaporative emission control (EVAP ... about the car's performance ...