P1509 Hyundai -

Question

What does "MPS - HIGH" mean with code P1509 for Hyundai Santa Fe?

Answer 1

P1509 Idle speed circuit

This mean the idle speed is is higher or greater than necessary to maintail its desire idle speed, The idle speed is controled by the TAC, (throttle actuator control) . There is a TSB that may apply to your condition . TSB 10- FL-010. This is for P2135 which is for the TPS. Depending on the scan tool you used, P2135 could be the code condition you have.