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I was sitting in my 2012 V6 having lunch today, with the engine running, A/C, etc.

After about 15 minutes, all of a sudden the engine started going from 1500 RPM to 3000 RPM, then down to 1500 and back up, over and over again. This went on for a few minutes.

I finally put the transmission in Drive and that brought it back to a normal idle, about 900.

I drove home later, no incidents.

Anyone have an idea what happened here?
 

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I was sitting in my 2012 V6 having lunch today, with the engine running, A/C, etc.
I believe the A/C compressor is electric (not driven by a belt from the crankshaft).

A *guess* would be that the engine revs up a little to maintain a charge on the battery to help keep all of the electronics running without depleting the battery too much.

.
 
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