EV Charger Not Charging? Utah Diagnostic Guide
Level 2 EV charger not delivering power, charging slowly, or throwing an error? Here's the order Utah EV electricians use to diagnose.
EV chargers are simple in concept but have multiple failure points: breaker, ground fault, charger electronics, vehicle handshake, and cable damage. Here's the order to check.
Diagnostic
Most likely causes (in order)
Walk through the list top-to-bottom. The first cause matches roughly half of cases we see in Utah; if it doesn't fit your symptoms, move to the next.
Tripped breaker on the charger circuit
EV charger circuits are 40A or 50A dedicated. If the breaker tripped (spike, fault), no power reaches the charger. Most common cause.
GFCI / arc fault trip
Some chargers have built-in GFCI; some installations include a GFCI breaker. Wet weather, vehicle ground-fault, or charger sensitivity can trip it. Reset and test.
Charger fault (red status LED)
Internal fault on the charger electronics. Tesla Wall Connector, ChargePoint, etc. all have status LEDs that decode the error. Check the manual or app.
Vehicle handshake failure
Charger and vehicle communicate before power flows. A failed handshake (often a vehicle software issue) shows as 'connected but not charging.' Sometimes a hard reset of the vehicle fixes it.
Damaged J1772 / NACS cable
Visible cable damage, melted connector, or pins corroded. Replace cable or charger.
DIY first
Safe checks you can do today
Each step is labeled by safety level. Stop at any “Pro only” step — that's where the diagnostic crosses into work that needs gauges, multimeters, or live electrical access.
Check the breaker for the EV charger circuit
CautionReset by pushing fully OFF then fully ON. If trips again immediately, stop and call.
Check the charger status LED
Safe DIYManufacturer-specific. Tesla: solid green = ready. Slow blink = vehicle plugged but waiting. Red = fault — check app for code.
Try a different vehicle (or different charger)
Safe DIYConfirms whether the issue is the charger or the vehicle. EV-driving friends often happy to swap a charge for diagnostic data.
Hard-reset the vehicle
Safe DIYTesla: press both scroll wheels for 10s. Most others: see vehicle manual. Sometimes clears handshake errors.
Stop here if breaker keeps tripping
Pro onlyPossibly a wiring fault, possibly a damaged charger. Live electrical diagnostic.
Stop and call
When you should call us instead
- Breaker re-trips immediately after reset — wiring fault or charger short
- Visible damage to cable, connector, or charger body
- Charger LED indicates a hardware fault that warranty service requires
- Charging much slower than spec — possible voltage drop or undersized circuit
Not sure if it's a real problem?
Our AI walks you through the same triage a senior tech would — figures out whether you need a service call or whether it's something simpler you can handle yourself. Or skip ahead and book a diagnostic visit.
FAQ
Frequently asked questions
Why is my EV charger working slower than rated speed?
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Most common: vehicle is set to a lower amperage limit (in-vehicle setting). Less common: undersized wire causing voltage drop, or temperature throttling on a hot day. Check vehicle settings first.
Related
More diagnostic guides
Other common Utah-home symptoms with the same step-by-step diagnostic format.
