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EVSE showing open ground

7599 Views 11 Replies 8 Participants Last post by  Sean-a-Tron
I bought a 2017 Volt Premier two weeks ago and am having some problems with my EVSE. We own two homes and have had the EVSE refuse to charge at both locations due to open ground. We solved the issue at our main home by replacing the outlet.

At our second home, we have a detached garage that is two years old. The EVSE shows open ground in any outlet we try to use in there. A plug-in tester indicates the outlets are grounded properly. We replaced an outlet in the new garage, since that helped at the other house, but it still does not work. I can run a heavy extension cord to the main house and the EVSE works fine.

Thoughts? Is it possible my EVSE is too sensitive?
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Thanks all, for the advice and the ideas on how to proceed - very helpful! To answer a question, the garage is on its own sub panel.
I appreciate all these responses! Much of it is over my head, but I will print this out for when I have the electrician out.

I had unplugged everything in the garage (except the garage door openers) to try to eliminate any noise, so I don't think it's a load problem.

At work we just replaced two of our fleet vehicles with EV's and our electrician is preparing to get level 2 chargers installed for these and for employee vehicles. EV charging is new to him, and he is wanting to learn everything he can. He's very interested in my problem and has offered to come out and take a look. I think I will first see if I can borrow one of the EVSEs from the fleet vehicles and see how that behaves in my garage to rule out the EVSE. If that shows a fault as well, I'll have the electrician come out and hopefully be able to fix things without too much trouble.
UPDATE: I was able to borrow an EVSE from a Ford Fusion Energi and it works just fine in my garage, where I have been having trouble with my Volt's EVSE. Do I have a case at the dealer to get a replacement EVSE?
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