DTC P0508 OBDII is stored next to the Check Engine light when the PCM (Powertrain Control Module) finds inconsistencies in the engine idle RPM.
It should be noted that when the PCM observes excessively slow engine operation, it attempts to correct the RPM, if unable to make those adjustments it sets this code.
No one likes to have a vehicle that is not running properly. And the P0508 code is a great indication that the vehicle is not running well at all. This could mean that the engine will stall at low speeds and when not pressing the accelerator, such as waiting for a brake light or even going into a turn. This can cause serious problems and it’s really dangerous to drive a car with such a fault. It is important to be aware of this code as soon as possible to ensure proper vehicle performance. Those who do not take care of this and other codes may find that their vehicle develops other problems as well.