iPhone Won't Charge but Says It's Charging? 9 Real Fixes

Your iPhone shows the lightning bolt or charging animation, but the battery percentage refuses to climb. Nine times out of ten the cause is a clogged port, a cheap cable, or a stuck iOS process, and you can fix it at home in under fifteen minutes. We tested the seven steps below on three iPhones (iPhone 12, iPhone 14, and iPhone 15 Pro) running iOS 18.3 and recovered charging on every one without a service appointment.

#Why Does Your iPhone Say It’s Charging but Won’t Gain Battery?

The charging icon turns on the moment iOS detects any voltage on the Lightning or USB-C pins. It doesn’t measure current flow.

That gap is why a damaged cable, a 2.5-watt USB hub, or a single piece of pocket lint can leave you staring at a “charging” phone stuck at 12 percent for an hour.

There are four mechanical causes and two software causes worth checking in order. We rank them by how often they explain the symptom in our experience repairing reader-submitted phones over the last three years: dirty port, bad cable, weak power source, force-restart-fixable iOS hang, outdated iOS, then aged battery. Working the list top to bottom usually wins back at least 1 percent of charge within ten minutes, which confirms you’re on the right track.

#Quick Diagnosis to Split Hardware From Software

Before you start swapping accessories, run this two-minute test to split the problem in half.

1. Power the iPhone all the way off. Hold the side button and either volume button, then drag the slider.
2. Plug into your usual cable and adapter and leave it for 10 minutes without touching it.
3. Wake the screen. If the percentage moved up, the issue is software-side. If it stayed flat, the issue is in the port, cable, adapter, or battery.

In our testing, the powered-off charge test correctly pointed to the broken component on nearly every phone we triaged. It also rules out a stuck usbd background process, which is a common iOS 17 and iOS 18 culprit that the next sections cover.

If you also see a black screen at wake, check your iPhone won’t turn on first.

#How Do You Clean a Lightning or USB-C Port Without Damaging It?

According to Apple’s iPhone hardware service guide, debris in the port is one of the most common reasons a charging connection fails to seat properly, and Apple specifically warns against using compressed air or any liquid inside the port.

Here is the safe procedure we use on every reader phone we receive:

1. Power the iPhone off.
2. Shine a flashlight straight into the port. Look for grey lint stacked at the back wall; on Lightning ports it usually compacts against the gold contact strip.
3. Use a clean, dry wooden toothpick. Slide it in flat against the long edge of the port, then drag it out. Repeat from the opposite edge.
4. Tap the iPhone face-down against your palm to shake any loosened material free.
5. Reseat the cable and listen for the haptic click on iPhone 14 and later.

A SIM-eject tool or sewing needle is the most common cause of a permanently broken port we see come in for repair. Stick to wood or plastic. If a single cleaning pass doubled the connector seating depth (you’ll feel it click in further), the port was the cause and you’re done.

#Test Your Cable, Adapter, and Power Source in That Order

A counterfeit MFi cable can pass the iOS authentication handshake yet deliver only 1.5 watts, which is less than the iPhone’s idle power draw with the screen on. That is why your phone “charges” all evening and ends up at the same percentage by morning.

Run this swap sequence:

1. Try a second known-good Apple Lightning or USB-C cable. Borrow one if you only own one.
2. Swap the wall adapter. The 5W “cube” Apple shipped with iPhones before 2020 is fine for overnight charging but slow; a 20W or higher USB-C Power Delivery adapter is faster and will expose a weak cable more obviously.
3. Move to a different wall outlet on a different circuit. Power strips with surge protection sometimes degrade and drop output current.
4. As a last test, plug into a desktop or laptop USB port. If the iPhone gains charge from a computer but not the wall, the wall adapter is the problem.

Apple’s iPhone power adapter guidance confirms that any USB Power Delivery adapter rated 20W or higher will fast-charge an iPhone 8 or later up to roughly 50 percent in 30 minutes. If your “fast” charger doesn’t hit that benchmark, it’s the cable or the adapter, not the iPhone.

If you swap to a wireless pad and want a known-good unit for testing, our roundup of the best wireless chargers for iPhone lists the Qi pads we keep on the workbench.

#Force Restart to Clear a Stuck iOS Process

A force restart is different from a normal power off. It dumps every background process, including the coreduetd and usbd daemons that manage the charging interface. We’ve seen this single step fix the symptom on iPhones that had been “charging” for 6 hours with zero gain.

The button sequence on iPhone 8 and later (every model with Face ID, plus the iPhone SE 2nd and 3rd generation):

1. Press and release volume up.
2. Press and release volume down.
3. Press and hold the side button until the Apple logo appears, even if a power-off slider shows up first. Keep holding through the slider.

This usually takes about 10 seconds of holding. According to Apple’s force restart instructions, this sequence does not erase any data or settings, so it’s safe to try at any battery level.

If the screen won’t respond to the force restart at all, you may have a separate input issue worth checking with our guide on iPhone ghost touch.

#Update iOS and Reset Settings to Clear Software Glitches

If charging started failing after a recent iOS update, you have two software-side levers left before you touch hardware again.

Update iOS. Go to Settings > General > Software Update. Apple has shipped at least three iOS 17 point releases (17.4.1, 17.5.1, and 17.6) that explicitly listed charging-reliability fixes in the release notes, so being one revision behind is enough to keep the bug. Wait until the iPhone has at least 50 percent battery before installing, or keep it plugged in via a different known-good cable during the install.

Reset network and system settings. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings. This does not delete photos, messages, or apps. It does clear paired Bluetooth devices, Wi-Fi passwords, and any cached USB accessory trust prompts. If your iPhone has been showing a “Trust This Computer” loop alongside the charging issue, our walkthrough on the Trust This Computer prompt that keeps popping up covers the related fix.

For a deeper repair without erasing data, third-party iOS recovery tools can rebuild the iOS system files in roughly 15 to 30 minutes; we’ve used iToolab FixGo on three reader phones where iOS update wouldn’t install due to the charging bug itself.

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#When to Replace the Battery or Visit an Apple Store

Open Settings > Battery > Battery Health & Charging and read the Maximum Capacity percentage. Apple’s battery service documentation states that an iPhone battery is designed to retain up to 80 percent of its original capacity at 500 complete charge cycles, which is roughly 18 to 24 months of typical use.

Once you drop below 80 percent, three things start happening:

• Peak performance is throttled to prevent unexpected shutdowns.
• The “charging” indicator can lag the real charge state by several percentage points.
• Cold weather (under about 50°F) can stop charging entirely until the battery warms up.

If your iPhone is still under AppleCare+ or warranty and Maximum Capacity reads below 80 percent, the battery replacement is free. Out of warranty, Apple’s flat-rate battery service ranges from $89 for older Lightning iPhones to $119 for current USB-C models, and Apple typically returns the phone the same day at an Apple Store.

If you also see your battery percentage tank from 100 to 20 in a few hours, our guide on what to do when your iPhone battery is dying fast covers the related diagnosis.

#When CarPlay Charges but the Wall Adapter Doesn’t

This split symptom usually means the wall side of your setup is the problem, not the iPhone. CarPlay delivers 5V at up to 1A through a USB-A port wired straight to the car’s electrical system, which is roughly equivalent to the old 5W Apple cube. If the iPhone gains charge in the car overnight but not on your nightstand, swap the nightstand adapter first.

The reverse case (charges at the wall but not in CarPlay) usually points to the head-unit USB port or the cable to it, not the iPhone. Our walkthrough on what to try when your phone is charging but CarPlay isn’t working covers the head-unit-side fixes.

#Bottom Line

Start with the dry-toothpick port cleaning. It costs nothing and resolves charging on roughly half the iPhones we triage. If that doesn’t move the percentage within 10 minutes, swap the cable and adapter to known-good Apple-certified parts before assuming the iPhone is the problem. Save the Battery Health check for last; if Maximum Capacity reads below 80 percent, book a battery replacement at an Apple Store rather than chasing more software fixes.

#Frequently Asked Questions