P0500 Vehicle Speed Sensor A Circuit Issue in 2015 Lexus IS350 RWD - ABS vs Transmission Sensor Confusion

Hi everyone, I recently purchased a 2015 Lexus IS35-0 RWD from an auction, and it's been showing a persistent P0500 fault code — Vehicle Speed Sensor 'A' Circuit. Key observations: • The car drives smoothly with no performance issues. • The speedometer functions correctly and displays accurate speeds. • The Check Engine light and Traction Off warning remain illuminated. • I've had wheel sensors and wiring inspected; all tests show no faults or damage. • Some mechanics believe the issue is related to a transmission speed sensor, while others claim the 2015 IS350 RWD only uses ABS wheel sensors for vehicle speed data. • Live data confirms that all four wheels are reporting accurate rotational speeds during operation. • OBD-II scan shows $7E9 (Vehicle Speed Sensor A) returns valid readings, but $7E8 (Transmission Speed Sensor) reads zero or no signal while driving. Questions: 1. Does the 2015 Lexus IS350 RWD model actually have a dedicated transmission speed sensor, or does it rely solely on ABS wheel sensors for vehicle speed input? 2. If all wheel sensors and live data appear normal, what could be causing the P0500 code to trigger despite functional readings? Any insights or experiences from owners of this model would be greatly appreciated.