EV Charger Error Codes Explained

EV charger error lights look alarming but map to a small set of causes: a ground fault, over-temperature, a communication error between car and charger, over-current, or simply no powerto the unit. Each brand codes them differently — by blink pattern, color or an app message — but the categories, and the safe responses, are consistent.

Always check your charger's manual for its exact code meanings; the categories below tell you what class of problem you are looking at and how seriously to take it.

Ground fault (the one to respect)

A ground-fault code means the charger's internal protection (the CCID) detected current leaking where it should not — a genuine safety trip. Unplug, inspect the connector and outlet for moisture or damage, and try once more. If it recurs, stop: repeated ground faults point to a real wiring, moisture or equipment problem that an electrician should diagnose. Do not defeat or bypass it. Damp outdoor installs are a common trigger — see our GFCI guide and charging in the rain.

Over-temperature

An over-temperature fault means the plug, cable or unit got too hot — often from a loose or worn connection at a plug-in outlet, which is exactly why a quality NEMA 14-50 receptacle matters. Let it cool, inspect the plug and outlet for discoloration or melting, and if you find heat damage, retire that outlet until an electrician replaces it. A cheap outlet cooking under load is a leading cause of this fault.

Communication error

The car and charger constantly "talk" over the control-pilot signal. A communication fault — the session won't start, or drops instantly — is often a connector not fully seated, a dirty contact, or an adapter in the chain. Reseat the connector firmly, clean the contacts, and remove any unnecessary adapter to test. See are adapters safe for how a poor adapter can cause this.

Over-current and no-power faults

An over-current fault means the charger drew more than the circuit allows — check that the charger's amperage is set correctly for the breaker, per our wire size and breaker guide. A no-power or dead-unit state usually means a tripped breaker or lost supply; if resetting the breaker doesn't hold, or it trips again, treat it as a circuit issue for an electrician. Our tripping-breaker guide covers this in depth.

The universal first steps

For any code: note the exact pattern, unplug and reseat, try the car's included cord or a different outlet to isolate the fault, and consult the manual. If a fault repeats — especially a ground fault or over-temperature — stop using the setup and get it inspected. Our general troubleshooting guide and why-it-stops guide complement this.