Does this truck have an Idle Air Control Valve?

Idle with engine at normal temp is 500rpm and seems low?

 

It is fly by wire. 500rpm in gear, neutral?
Smooth, rough, gonna stall?

 

500rpm sitting at full stop with truck in drive. Every time I stop at a stop sign or traffic light the rpm gauge drops to 500.

2wks ago my truck was idling rough while sitting still and transmission in drive but brake on. I pulled the throttle body and cleaned it. The rough idle stumble went away after cleaning.

 

It could be a faulty gauge reading. My truck's RPM guage would drop to less than 500 RPMs even though it ran perfectly fine.