[TJay74]

Originally Posted by MrChrisLS3

At this point your service advisor is probably correct. There are so many sensors and components involving engine management that every great once in a while a voltage spike or no voltage read on any of them can cause something like this. If it just came on for a few seconds, then went away completely and did not set a code, it was more likely than not something like this. These systems are designed to run multiple checks. It's when it fails the check x amount of times that the code is set. Some of these are more sensitive than others. A misfire fault will flash the light almost immediately, however, when the system rechecks and the condition is no longer detected, it goes off. You may very well never see it again. If it does happen again, get it checked out.

Of course, if the engine was actually misfiring, running rough, then it should be checked immediately.

While it is true on the sensors, the flashing check engine light has always been associated with misfire detection.