Optimized Idle fails, check engine light.
When I have optimized idle set on the truck, I hear the warning buzzer that it's about to start up, it gives about half a crank, and then goes dead without starting and gives a check engine light. When it does this, it will not start until I reset by turning the key off about 10 seconds and then restarting, clearing the code in the process. It's not all the time, and usually happens in the middle of a long cycle like during a 10 hour break. There have also been a few times where the buzzer sounds and the engine doesn't even attempt to crank. It goes directly to the CEL. It also doesn't always happen, but usually a few times a week, and doesn't leave any lasting codes.
I've had it in the shop and they said everything was working normally and don't pick up anything in the code history.
Is this a good question?