The problem in for this OP was that the electrician did not connect the ground in the panel to the neutral. As
@davewill says, the ground for the outlet must be bonded to neutral in the main panel, not at the outlet. It wasn't clear where the electrician was saying it was connected.
For your question, it's unclear what your issue is, and as indicated above, pictures would be helpful.
1) Pictures
2) Any messages indicated in the vehicle?
3) Picture of the light sequence on the UMC. (I assume we're talking about a UMC.)
Good luck. In any case this should be a pretty simple issue to solve unless your house has a pre-existing electrical issue.