Why Is My EV Charger Not Charging?

You plugged in your EV last night. This morning, the battery is exactly where you left it. No charging happened, and now you’re running late with less range than you need.

An ev charger not charging is more common than most EV owners expect, and the cause isn’t always what you’d guess. Some of the most frequent culprits are settings you can fix in under a minute. Others point to electrical problems in your home that need a licensed electrician before they become safety issues. This post walks through the most common reasons a home EV charger stops working and tells you what to check first.

Start Here: Quick Checks Before Assuming a Hardware Problem

Scheduled Charging Timer

The most overlooked cause of an EV that’s plugged in but not charging is a scheduled charging timer. Nearly all modern EVs and Level 2 smart chargers offer scheduled charging, which lets you defer charging to off-peak hours when electricity rates are lower. If you or a previous driver enabled a timer, the charger will appear active but hold power until the programmed window opens.

Check both places: your car’s infotainment settings and the charger’s companion app if it has one. Many EVs sold after 2022 have scheduled charging enabled by default, and software updates sometimes reset charging preferences without warning. If a timer is active outside your expected window, turning it off will start charging immediately.

The Connector Isn’t Fully Seated

Before your EV and charger begin exchanging power, they run a brief communication handshake to confirm the connection is secure. If the connector isn’t fully clicked into the charge port, that handshake fails and no power flows. Unplug the connector completely, wait a few seconds, and reseat it firmly until you hear or feel it click. This resolves a significant share of single-session charging failures.

The Breaker Has Tripped

A Level 2 home charger runs on a 240-volt dedicated circuit. If the breaker for that circuit has tripped, the charger has no power. Go to your electrical panel and look for a breaker in the middle position rather than fully on or fully off. Reset it by switching it fully off and then back on. If the breaker trips again as soon as you try to charge, stop there and call a licensed electrician; a breaker that won’t hold is telling you something is wrong with the circuit.

The Car Itself Has Charging Restrictions

Some vehicles limit charging based on battery temperature, state of charge ceilings set by the driver, or manufacturer-recommended charging behavior. If your battery is already at or near a set limit, or if the battery is too cold or too hot, the car may refuse to accept charge even with a functioning charger. Check your vehicle’s battery management display and consult the owner’s manual if you see a temperature or charge limit message.

Electrical Causes That Need a Licensed Electrician

The Circuit Isn’t Dedicated

Under NEC Article 625.42, EV charging equipment must be supplied by a dedicated branch circuit. Sharing a circuit with a dryer, air compressor, refrigerator, or any other significant load is a code violation in most U.S. jurisdictions, and it’s also an operational problem. An EV charger is a continuous load that may draw its maximum amperage for six to ten hours straight. Sharing a circuit with anything else creates overload risk and nuisance trips that interrupt charging overnight.

If your charger was installed on an existing outlet rather than a dedicated circuit, or if you’re not sure how the circuit was run, an electrician can verify the setup and correct it if needed.

The Circuit Is Undersized for the Charger

Level 2 EV chargers require dedicated 240-volt circuits sized at 125 percent of the charger’s rated continuous current, per NEC Article 625 and NEC 210.20(A). For a common 40-amp charger, that means a 50-amp breaker and appropriately rated wire. For a 48-amp charger, a 60-amp breaker is required. If a previous installer used a smaller breaker or undersized wiring, the breaker will trip repeatedly under the charger’s normal load, and continuing to reset it doesn’t fix the underlying mismatch — it just creates heat and wear on the breaker.

A licensed electrician can confirm whether your existing circuit is correctly sized for your charger and correct any mismatches before they cause further problems.

The Panel Doesn’t Have Capacity

Older Fresno homes, particularly those built before the 1990s with 100-amp electrical service, may not have the capacity to add a Level 2 charging circuit without a panel upgrade. If your panel is already loaded with a central AC system, electric water heater, electric dryer, and other major appliances, adding a 50- or 60-amp EV circuit may exceed what the panel can safely carry.

A proper load calculation, not a visual inspection of available breaker slots, is what determines whether a panel can support EV charging. An electrician who skips the load calculation and simply adds a breaker is cutting corners that can create safety problems later. If your home needs a panel upgrade to support EV charging, Allbritten’s electricians can evaluate your current service and handle the upgrade as part of the charger installation.

Wiring Issues or a Failed Charger Unit

If your charger is hardwired and all the above have been ruled out, the issue may be within the charger unit itself or in the wiring between the panel and the charger. Loose connections at the charger’s terminal block, a failed internal component, or wiring that has degraded can all produce intermittent or total charging failure without triggering a breaker. These require hands-on diagnosis by a licensed electrician with the right test equipment.

Smart Charger and Software Issues

Most Level 2 home chargers sold today are Wi-Fi connected and managed through a companion app. This adds useful features like scheduling, energy monitoring, and remote control, but it also adds another failure point.

Wi-Fi Connectivity Problems

If your charger relies on a Wi-Fi connection for its scheduling or management functions and the router’s signal doesn’t reach your garage reliably, the charger may not behave as expected. Some smart chargers require a stable connection to validate a charging session or to sync scheduled windows from the app. Check whether the charger’s indicator lights suggest a network fault and confirm your garage has adequate signal.

Firmware That Needs Updating

Smart chargers receive firmware updates that fix bugs, improve compatibility, and add features. If your charger’s firmware is out of date, particularly after your vehicle received a software update, a communication mismatch between the car and charger can prevent charging from starting. Check the charger manufacturer’s app or website for available firmware updates and install them before assuming a hardware failure.

A Simple Restart Fixes Many Software Faults

For smart charger failures that don’t have an obvious cause, a structured restart often clears the fault. Unplug the connector from the car, power down the charger by switching off its breaker for 30 seconds, then restore power and reconnect. This clears transient software faults and re-establishes the communication link between the charger and your home network.

How to Narrow Down Where the Problem Is

One diagnostic step saves a lot of guesswork: if your EV charges normally at a public Level 2 station or a friend’s home charger, you can rule out a serious problem with the car’s onboard charger or battery management system. The problem is in your home installation.

Conversely, if your EV won’t charge at public stations either, the issue is almost certainly in the vehicle rather than your home wiring. That points to a dealership or EV service appointment rather than an electrician.

If you can also plug in a Level 1 charger (the standard 120-volt cord that comes with most EVs) and it charges slowly but correctly while the Level 2 won’t work, the 240-volt circuit or the Level 2 unit itself is the failure point, not the car.

Frequently Asked Questions

My EV charger worked fine for months and suddenly stopped. What happened?

Several things can cause a charger that worked previously to stop: a breaker that has weakened over time and now trips under load it previously handled, a firmware update to the car or charger that introduced a compatibility issue, a Wi-Fi or app glitch on a smart charger, or a wiring connection that has loosened at a terminal. Start with the quick checks in the first section, and if those don’t resolve it, call an electrician for a circuit inspection.

Is it safe to reset a tripped breaker and keep charging?

Once is reasonable. If a breaker trips once and holds after you reset it, there may have been a transient event. If the breaker trips again the next time you charge, or trips repeatedly, do not keep resetting it. A breaker that won’t hold under normal charging load is telling you the circuit has a problem. Continuing to reset it instead of diagnosing the cause can overheat wiring inside your walls. Call a licensed electrician.

Can I use an extension cord with my Level 2 charger?

No. EV manufacturers explicitly advise against using extension cords for Level 2 charging. A Level 2 charger draws continuous high-amperage load for many hours. Standard extension cords are not rated for sustained loads at that amperage, and using one creates a significant overheating and fire risk. If your charger’s cord doesn’t reach your vehicle’s charge port, the solution is relocating the charger or running the circuit to a better position, not adding an extension cord.

My charger shows a fault code. What does that mean?

Fault codes vary by manufacturer and model, so the first step is looking up the specific code in your charger’s manual or the companion app. Common fault categories include ground fault detection (a safety response to an electrical anomaly), communication fault (a problem with the car-charger handshake), and overcurrent protection (the charger detected a current draw that triggered a safety shutoff). Ground fault and overcurrent faults should be evaluated by a licensed electrician rather than cleared and ignored.

Does my home need a panel upgrade to add an EV charger?

Not always, but it depends on your home’s existing electrical service and current load. A 200-amp service panel with available breaker capacity can often accommodate a Level 2 EV charging circuit without an upgrade. Older homes with 100-amp service, or homes where major appliances have already consumed most of the panel’s capacity, may need a panel upgrade first. The right answer requires a load calculation from a licensed electrician, not an assumption based on panel age or the presence of open breaker slots. Allbritten’s electricians can assess your panel and tell you exactly what your home needs before installation begins.

When to Try a Fix Yourself and When to Call

The quick checks in the first section, timers, connector seating, a tripped breaker, and car-side settings, are safe for any homeowner to run through. If those don’t resolve the problem, the causes that remain are almost all electrical: a circuit that isn’t dedicated, isn’t correctly sized, or has a wiring issue that requires proper diagnosis.

Fresno homes vary widely in electrical panel capacity and wiring condition, particularly in neighborhoods where homes were built before EV charging was a consideration. Allbritten’s licensed electricians have handled EV charger installations and electrical assessments across the Central Valley since 1932. Whether your charger needs a circuit correction, a panel evaluation, or a full EV charger installation from scratch, call 559-601-0833 or schedule a visit at allbritten.com.