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EVSE showing open ground

7597 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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Sub-panels can also be tricky if they're not properly setup with neutrals & grounds separated. The panels usually come with a screw in place that bonds the neutrals & grounds. That bonding should only occur in the main panel (technically inside the main disconnect, but that's usually the main panel). So, in a sub-panel the screw needs to be removed and separate bus-bars must be used for neutrals & grounds.

If your garage sub-panel has neutrals & grounds mixed together on the same bus-bars, you could wind up with stray current on the ground that the EVSE doesn't like.

Electrician should be able to straighten it out for you.
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?
You'd have a better case if an identical Volt EVSE worked. It's possible the Ford unit is less sensitive. Problem is, if they plugin your unit at the shop, and it works, they may blame your home wiring.

But, it can't hurt to try!
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