Why is my EV charger not charging?

Start with the car, schedule, utility power, and charger status

The fastest first check is whether the car is allowed to charge right now. Many no-charge calls turn out to be a vehicle schedule, app setting, or utility interruption rather than a failed charger.

Before opening the panel or resetting anything, check the simple items in this order:

• Vehicle charge schedule: the car may be set to start after midnight, stop at a target percentage, or charge only during off-peak or ultra-low-overnight hours.
• Charge limit: if the battery is already at the set limit, the charger may show ready but deliver no current.
• Connector fully seated: push the handle in firmly until the latch engages. A half-seated J1772, NACS, or adapter connection can pass some signals but not start charging.
• Vehicle message: look for wording like charging delayed, charging stopped, charge port fault, connector not locked, or reduced current.
• Charger lights or screen: note the exact colour pattern or error number before you reset anything.
• Utility power: confirm the rest of the house has power and check whether Toronto Hydro, Alectra, Hydro One, or your local utility has an outage in your area.

Also check whether the charger is online only if the model needs app control for scheduling. Most hardwired Level 2 chargers can charge without Wi-Fi, but some will not start if the app has an active pause, locked access, or a utility demand-response setting.

If the car charges normally at a public Level 2 station or on a portable cord, the problem is more likely at the home charger, circuit, breaker, GFCI protection, or load-management equipment. If the car refuses to charge anywhere, start with the vehicle or manufacturer support before paying for electrical troubleshooting.

If the breaker, GFCI, or load management stopped it, do not keep forcing resets

One careful reset is reasonable; repeated resets mean the circuit is telling you something is wrong. EV charging is a long, high-current load, so weak terminations, incorrect breaker type, nuisance GFCI interaction, or a load-management device can stop charging even when the charger looks normal.

Use this table to narrow the cause without guessing:

Load management deserves special attention. In Ontario homes with 100A service or several large electric loads, an EV energy management system can pause charging when the house load is too high. That is not necessarily a failure. It is supposed to protect the service from overloading.

The issue is when it never releases charging again. We often look for a failed current sensor, reversed CT clamp, loose communication wire, incorrect charger current setting, or a controller that lost its configuration after a power outage.

If your main symptom is the breaker tripping, the deeper troubleshooting path is covered on why an EV charger trips the breaker. If the connector, cable, breaker, or wall unit feels unusually hot, stop using it and read why an EV charger gets hot before the next charging session.

Connector and charger error codes are often mechanical, communication, or configuration problems

A charger can have full power and still refuse to charge if the vehicle and charger do not complete their safety handshake. Level 2 charging is not just a live plug; the charger and car communicate before current is allowed to flow.

Common connector-level causes include:

• Dirt, ice, road salt, or moisture in the charge port or plug
• A damaged latch or lock pin that prevents the vehicle from confirming connection
• A worn adapter between NACS and J1772 or CCS-style equipment
• Strain on the cable pulling the handle slightly out of alignment
• A bent pin, cracked handle, or damaged cable jacket
• A vehicle charge-port door or lock that is not fully open or released

Do not spray cleaners into the connector or file the pins. Unplug the handle, inspect with a flashlight, remove visible debris gently, and let wet equipment dry. If the connector was dropped, driven over, frozen into the port, or pulled out under tension, the cable assembly may need replacement.

Error codes matter. Take a photo of the charger screen or app before cycling the breaker. Many chargers store faults such as ground fault, relay stuck, over-temperature, no ground, input voltage abnormal, contactor failure, or pilot fault. Those point in different directions.

For example, no ground may lead us to test the equipment grounding conductor and panel bonding. Input voltage abnormal may lead to the breaker, panel bus, splice point, or utility supply. Pilot fault points more toward the charger electronics, connector cable, or vehicle communication.

If the charger has dip switches or app-based commissioning, the maximum output may have been set incorrectly. A charger set for a 60A circuit but installed on a 40A breaker is a real problem. A charger set too low is less dangerous, but it can make the owner think the unit is not working because the car adds range very slowly.

A Level 2 charger needs a correctly sized dedicated circuit and matching settings

Most Level 2 chargers should be on a properly sized dedicated 240V circuit, with the breaker, wire, disconnecting means where required, and charger output all matched. Sharing the circuit with other loads, changing breaker size without checking wire size, or relying on an old receptacle can create intermittent no-charge problems.

EV charging is treated as a continuous load. In practical terms, the usable charging current is usually limited to 80% of the breaker rating:

The exact breaker and wire depend on the charger manual, installation method, conductor type, temperature ratings, distance, and Ontario Electrical Safety Code requirements. If you are unsure, see what size breaker you need for an EV charger before changing any setting.

A dedicated circuit also helps troubleshooting. When the charger is the only load on that breaker, voltage drop, ground-fault leakage, nuisance tripping, and loose terminations are easier to isolate. If a garage receptacle, heater, freezer, opener, or lighting load is tied into the same circuit, the symptoms can look random.

Hardwired chargers remove one common failure point: the plug and receptacle. A NEMA 14-50 installation can be acceptable when done correctly with the right receptacle, box, wiring, breaker, and GFCI protection where required, but repeated plugging, heavy cable strain, and low-grade receptacles can cause connection problems over time.

Service capacity matters too. A charger may be perfectly healthy but paused by an EVEMS or limited by a panel that cannot safely take the added load. If your home has 100A service, electric heat, a hot tub, or future battery storage plans, read whether an EV charger can run on a 100 amp panel before assuming the charger itself has failed.

Call a licensed electrician when the fault follows the circuit, not just the car

You need electrical service when the charger has power problems, repeated faults, nuisance GFCI trips, failed load management, damaged wiring, or any sign that the circuit was not installed to match the equipment. Do not bypass a GFCI, oversize a breaker, use an extension cord, or keep resetting a breaker to get one more charge.

An electrician troubleshooting a no-charge Level 2 unit should check more than whether voltage is present. The useful inspection includes:

• Confirming the breaker size matches the charger setting and conductor size
• Testing line-to-line and line-to-ground voltage under load where safe
• Checking torque and heat signs at the breaker, neutral/ground bar, disconnect, receptacle, and charger terminals
• Verifying grounding and bonding continuity
• Looking for water entry at outdoor boxes, conduits, hubs, and the charger body
• Confirming GFCI protection and identifying whether the breaker and charger GFCI functions are interacting
• Checking EVEMS sensors, wiring direction, communication, and programmed limits
• Reviewing the charger error history before clearing it

If the original installation did not have the required ESA notification, correcting it may require opening a proper notification and arranging inspection. ESA inspection for an EV circuit commonly focuses on the wiring method, overcurrent protection, grounding and bonding, equipment rating, outdoor weatherproofing, labelling, and whether the installation matches the charger instructions.

If the fix is minor, it may be a repair. If the charger needs a new circuit or reinstallation, cost depends on access and panel capacity. As a reference point, a simple Level 2 installation with panel capacity nearby is commonly in the $800–$1,500 range for labour, materials, and ESA notification; longer finished-wall routes can move into the $1,500–$3,500 range, and many complete homeowner installs land around $1,500–$3,000.

City Power Electrical Services is a Licensed Electrical Contractor, ECRA/ESA #7015314, and we provide written estimates for EV charger diagnosis, circuit repair, and EV charger installation across Toronto and the GTA. If you are planning around downtime, how long an EV charger installation takes gives a realistic sense of the work, inspection, and utility coordination that may be involved.