Tesla alert code · Charging system
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Tesla UMC_a017 alert: Charge rate reduced, wall plug temperature high
UMC_a017
Charge rate reduced, wall plug temperature high
Wall outlet and wiring inspection recommended
Needs attention
Top line is Tesla's on-screen wording. The level is RideRite's own read.
2 / 23
Teslas on RideRite's tools that have logged UMC_a017
2
times it was recorded in all, as of September 2026
Short answer
The Tesla Mobile Connector measured its wall plug running hot and cut its charging current in half to protect the plug and outlet. Level: needs attention.
What UMC_a017 means
The Tesla Mobile Connector measured its wall plug running hot and cut its charging current in half to protect the plug and outlet. Tesla's internal name for this alert is UMC_a017_wallPlugOTFoldback, and Tesla recommends having the outlet and wiring inspected. Heat at a wall plug usually means a worn outlet, a loose connection or wiring not suited to the load. Of all the charging alerts, this is the one not to sit on.
What to do
- 1Stop charging from that outlet at full current until it is checked.
- 2Have an electrician inspect the outlet, the connections and the wiring, as Tesla recommends.
- 3Look at the plug and outlet for discoloration, melting or a burning smell. If you find any, stop using that outlet.
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Ride Rite is a mobile Tesla repair shop based in San Jose. We diagnose charging problems, from the charge port to the wall outlet, in your driveway or office lot across the Bay Area with dealer-grade diagnostic equipment, then tell you plainly what the car needs.
Common questions
Is UMC_a017 dangerous?
It is a warning sign. A hot wall plug points at the outlet or wiring, and Tesla recommends an inspection.
Is UMC_a017 a problem with my car?
Usually not. The Mobile Connector is protecting itself from a hot outlet. The fix is on the house side.
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See pricing and book onlineSources: the alert text and internal alert name your car reports to Tesla, Tesla's owner's manual where the code is listed, and alert records from Teslas connected to RideRite's tools.
All Tesla alert codes explained
Ride Rite Mobile Auto Services is an independent mobile Tesla repair shop in San Jose, California. Not affiliated with Tesla, Inc. General information, not a diagnosis of your specific car. Updated September 2026.
