What would cause engine light to come on car runs smooth at all times i have code p0506?

Question

What would cause the engine light to come on car runs smoothly at all times I have code p0506 on my Ford?

Answer 1

HI there,

This code is usually a code for the idle speed. This won't really affect the way the vehicle is running, just that the computer sees the idle speed as abnormally high. This can be the result of a needed relearn if the system is an electronic throttle or a problem with a vacuum leak keeping the idle to high.

Answer 2

P0506 - Idle Control System RPM Lower Than Expected
Read more: https://www.autocodes.com/p0506.html