Welcome to 2CarPros.
I don't want to cause problems, but that code isn't from sitting in the lot. Basically, it means the (ECM/PCM), has detected a problem related to the the de-energizing process with the power relay which supplies it with power. In other words, power was removed too soon.
With that, you could experience hard starts / no start conditions or driveability issues. What can cause this is a short between the control module and the power relay, a blown fuse or fusible link, or the power relay itself. It does need addressed because it could leave you stranded.
Honestly, I feel the cause needs to be confirmed and if problems develop related to this condition, there needs to be an extended warranty on said components. I honestly don't feel sitting on the lot would cause this issue.
Let me know if this helps or if you have other questions.
Take care,
Joe
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Saturday, July 27th, 2019 AT 8:39 PM