Not 100% sure on the Bolt but historically GM firmware clears many codes after xx number of successful key-on, key-off events to not confuse diagnostics in the future with stale codes from the distant past...
Edit: and almost to prove my point the post above this explains how "10 key on key off" events "fixed" his issue ;-)
It's hard to know whether to be happy about the extensive checking that the car is doing or to be incredibly annoyed at how sensitive it is to transient problems...
It seems to me that they could do a better job of logging these exceptions for later diagnosis and not bothering the driver about them unless they actually become some sort of operational issue.
GM has "maturation" rules for every code that could light the MIL. IE if things could happen a few times before telling the driver or how many events before lighting the light, are the events sequential or are they spaced apart, you get the idea.
An exception is Safety related. If somehow the event that occurred could ever potentially be a safety issue the issue may only need to happen once to set a code and warn the driver.
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