Had that happen to me on my previous car, took it to the dealer and couldn't tell me what it was but did suggest to clean the ICV. I instructed them to reflash the DME and they argued that it won't do any good.
Problem was corrected after the reflash.
Here's the thing, prior to that happening, my FSR went out and the blower kept going even after turning the ignition off. So I had to disconnect the battery every time I leave the car. In the process of doing so, the DME got messed up.
If you did anything electrical on your car, that could be it, if not then use the search feature and check the various answers and fixes, as some had the same problem but different remedies.