Most cars that are plugged in all night but don’t charge are stuck on a scheduled charging setting or a sleep-mode glitch, not a broken charger or a broken car. It’s one of the most common calls we get, someone plugs in before bed, wakes up expecting a full battery, and finds the same percentage as the night before. The cable is seated, the port light looks normal, and nothing charged. Here’s what’s actually going on and how to tell a settings problem from a real fault.
The most common cause: a scheduled charging setting
Nearly every EV lets you set a departure time or an off-peak charging window to take advantage of cheaper electricity rates, and SDG&E’s EV-TOU-5 plan makes this especially common in San Diego County. The car holds off charging until the scheduled window opens, usually somewhere between midnight and 6 a.m.
The problem is that this setting is easy to set once and forget. If your work schedule shifted, if you plugged in later than usual, or if the app updated a default, the window can end up starting after you’ve already left for the morning. Check your car’s app or center screen for “scheduled charging,” “charge on departure,” or “off-peak charging” before assuming anything is broken.
The second most common cause: the car went to sleep
EVs that sit unplugged for a while, or that get plugged in several hours before their scheduled window opens, can drop into a low-power sleep state. Some vehicles have reported trouble waking back up cleanly enough to start a charging session on schedule. This shows up most on cars plugged in early in the evening with a charge window set for well after midnight.
A few things reliably wake a sleeping car: opening and closing a door, unlocking with the key fob, or starting the climate control from the app. If any of those triggers the charge to kick in a few minutes later, the sleep state was the issue, not the hardware.
Quick reference: cause and first check
| What you see | Likely cause | What to check first |
|---|---|---|
| Same percentage as last night, cable seated fine | Scheduled charging window set later than expected | App or dash settings for departure time or off-peak window |
| Charging starts fine if you unplug and replug | Car went into a sleep state before the window opened | Open/close a door or start climate from the app, then check again |
| Charging stopped partway through the night | Charge limit already reached, or a real interruption | Check your set charge limit before assuming a fault |
| Green light on the charger, nothing on the car’s screen | Loose connection or a communication fault | Reseat the cable fully and listen for the port to click |
| Breaker or GFCI tripped at the panel | Electrical fault on the circuit, not a car problem | Don’t just reset it repeatedly, see our breaker-tripping guide |
When it’s not a settings issue
If you’ve confirmed the scheduled window was open all night and the car still didn’t charge, a few real faults are worth ruling out.
A loose or partially seated cable. Home charging cables can back out slightly if they’re under any tension, especially on a wall-mounted unit with a short reach to the car. Reseat the plug fully until you hear or feel it click into the port.
A tripped breaker or GFCI. If the circuit lost power partway through the night, the charger has no power to deliver even though the cable is still connected. Don’t reset the breaker more than once on your own. Repeated nuisance tripping usually means an electrical issue that needs a licensed electrician, not a repeated flip of the switch.
A fault light on the home charging unit itself. Most home EVSE units have a status light that changes color or pattern for a real fault versus normal standby. A solid or blinking red light usually means the unit itself needs service, separate from anything on the car’s side.
A dead or weak 12V battery. The car’s low-voltage battery has to be healthy enough to run the computer that manages charging. If the 12V is failing, a charge session can start and then quietly drop. Our guide on what happens when an EV’s 12V battery dies covers the warning signs.
What to do if you’re low on range and need to leave now
If it’s morning, the battery is low, and you don’t have time to troubleshoot, the safest move is to skip the guessing and get moving with what you have. Our mobile EV charging service brings a Cybertruck rescue truck straight to your driveway and delivers real range on the spot, no appointment at a shop and no waiting on a fix. If your range is already tight and you’re not sure it’ll hold until you can charge properly, our guide on what to do when you’re running low on battery walks through how to stretch what’s left safely.
Frequently asked questions
Why did my EV say it was charging but the percentage never went up?
That combination usually points to a scheduled charging window that hadn’t opened yet, or a session that started and then stopped because a charge limit was already reached. Check your app’s charging schedule and your set charge limit before assuming the hardware failed.
Can leaving an EV plugged in without charging hurt the battery?
No. Being plugged in without an active charging session doesn’t stress the battery. The car’s software is simply choosing not to draw power yet, whether that’s a schedule, a sleep state, or a limit already met.
Should I just reset the breaker if the charger has no power in the morning?
Once, yes. If it trips again right away, stop resetting it and call an electrician. A breaker that keeps tripping is protecting you from a real fault on the circuit, and repeatedly resetting it can mask a bigger problem.
How do I know if it’s my car’s fault or the home charger’s fault?
Check the status light on the charging unit itself. A normal standby light with the car showing an error usually points to the car’s side, most often a scheduling or sleep issue. A fault-colored light on the unit points to the charger.
What if I need to leave and the car barely charged overnight?
Call us before you gamble on a low battery. We’ll bring a charge to you wherever you’re parked, so you don’t have to find a station or wait on a diagnosis first.
Call Charge Pro SD at (858) 400-4465 and we’ll be on our way.