Low idle

[flipmode815]

My 2014 Silverado has a low idle,  it came on suddenly when sitting in a drive thru line.  It first sounded like the truck was going to die but didn't,   truck doesn't idle rough just low, seems to run fine otherwise and getting right around 18mpg.  It's been about 2 weeks now and still the same,  any ideas to check?

[1SLOW1500]

Low? What's low 400? Normal the tuning is set at that once engine temp is over 180.

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[jagabom (Esquire)]

My 2014 would idle at 500 sometimes.  Little too low.  Not sure on the 14 but on some years you can buy a tuner to raise the idle.  Mine would vibrate at 500.  Very annoying.  

Jim