How to fix Galaxy S9 Plus that won’t charge due to moisture detected error

Today’s troubleshooting article will handle two charging cases for the #GalaxyS9. If you are having a problem charging your S9 after it got wet, this article should help you.

Problem #1: How to fix Galaxy S9 Plus that won’t charge due to moisture detected error

The phone (Galaxy S9 Plus) will not charge due to it detecting moisture in the charging port or USB cord. This has been the case for over 8 hours now. I expected it to be dry by now. I had went to the beach, I did NOT submerge the phone in water. However, i was nearby a waterfall but the phone was not in direct contact with the falls. I made sure to quickly rinse the phone with fresh water after leaving, as recommended by several websites.

Solution: If your Galaxy device was charging normally before you went to the beach and the falls, the moisture detected error you’re getting is most probably accurate — that there’s indeed water or moisture in the charging port at this time. We know that many Galaxy S8 devices last year got moisture detected errors popping up due to a software coding issue but we don’t think your device has that problem now. The port must simply be wet or still has traces of moisture so you want that taken care of. Below are the things that you can try.

Force reboot the phone

In case the moisture detected error is just a false alarm, do a restart and see what happens. Here’s how to do that:

  1. Press and hold the Power + Volume Down buttons for approximately 10 seconds or until the device power cycles. Allow several seconds for the Maintenance Boot Mode screen to appear.
  2. From the Maintenance Boot Mode screen, select Normal Boot. You can use the volume buttons to cycle through the available options and the lower left button (below the volume buttons) to select. Wait for up to 90 seconds for the reset to complete.

Wipe the phone dry

This is basic. Wipe the phone with a clean, soft cloth to ensure that the external parts and cover are all dry. If you’ve already did this before contacting us, just skip it and proceed to the next suggestion.

Use low power vacuum

While this is not normally recommended by many technicians, you can actually try it provided that you do it with care. Also, you need to use low power vacuum to do the job. The regular one you’re using to clean your floor won’t work. If you have access to a portable vacuum cleaner that’s usually powered by a car’s USB port, that’s the one. When using it, be sure not to place the phone too close to the vacuum cleaner to prevent damaging the hardware. Hold your phone about two inches away with the charging port facing the vacuum cleaner for a few seconds only. Remember, your goal is to suck away very tiny specks of moisture so it doesn’t take much energy. We found this technique effective in drying out an S7’s charging port in the past. If done properly, it’s also an efficient way to dry the device.

Let moisture evaporate naturally

Water usually evaporates naturally on its own after a few hours. To allow moisture to disappear on its own without your intervention, place the device near an indirect heat source like the back of a powered on TV or computer tower. The mild extra heat should help hasten the evaporation process. Make sure that your S9 is inverted, with the charging port at the top so water molecules are free to go up when enough temperature for evaporation is reached.

Do not place your phone near an oven or fireplace unless you want to kill it.

Use another charging cable and adapter

In case the problem is with the current charging cable and adapter, try using a different pair and see what happens. Or, you can use your current charging cable and adapter to charge another S9. either way should help you check whether or not there’s a problem with them.

Charge wirelessly

As a workaround, you can always charge your S9 Plus wireless. This is definitely not a permanent solution but it should help you charge your device while waiting for the result of your troubleshooting steps. By charging your S9 wirelessly, you’re also generating some heat on the device which may also hasten the evaporation process of moisture in the charging port.

Problem #2: Galaxy S9 stopped charging while it’s on and keeps lagging after an update

Hi. My mom and I both have the Galaxy S9. Our phones are updated over the weekend and it’s been kind of a rough go. I’ve managed to work my way through most of the settings, even found a few things I like about it, but two things are still bothering me. A) My phone will not charge while on. It overheats and acts like it wants to freeze up when plugged in and about once every five minutes I’ll hear the chime that it’s charging, but nothing. However the charging battery icon is there the whole time, it just never changes. But it fast charges just fine while it’s turned off! And B) it takes sweet forever for the phone to come up. Used to be I could restart it and within 30 seconds I could use it again. Now 4 or 5 minutes later I’m still waiting. I’ve already cleaned out unwanted apps and cleaned as much memory as I could, but still having the problem. What can I do? Thanks so much for the help!

Solution: The Galaxy S9 devices already came with Android Oreo so whatever update you installed, it must have messed up the system. Try wiping the cache partition first to see if a refreshed system cache will fix the problems. Here’s how:

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the Android logo displays, release all three keys.
  4. An ‘Installing system update’ message will show for 30 – 60 seconds before the Android system recovery menu options appear.
  5. Press the Volume down key several times to highlight wipe cache partition.
  6. Press Power key to select.
  7. Press the Volume down key to highlight yes, them and press the Power key to select.
  8. When the wipe cache partition is complete, Reboot system now is highlighted.
  9. Press the Power key to restart the device.

Install app updates

After wiping the cache partition, make sure that you install updates for all apps. This includes apps installed from the Play Store (and outside of it). To check for app updates via Play Store:

  1. Open Play Store app.
  2. Tap More settings at the upper left (three-line icon).
  3. Select My apps & games and update your apps.

If you have apps installed outside of the Play Store, make sure that they are compatible with Android Oreo. If you are not sure, contact their developers.

Check how phone works on Safe Mode

There’s a chance that one of your apps is causing the troubles. To check, you want to restart your S9 to safe mode. When on safe mode, your phone will not allow third party apps to run. So, if your device works properly on safe mode but has trouble charging or has slow performance issue in normal mode, that’s a clear sign that one of the third party apps is causing the problem.

To boot your S9 Plus to safe mode:

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen.
  3. When “SAMSUNG” appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see Safe Mode.
  8. Observe the phone for a few hours and see if the problems remain.

To identify which of your apps is causing the trouble, you should boot the phone back to safe mode and follow these steps:

  1. Boot to safe mode.
  2. Check for the problem.
  3. Once you’ve confirmed that a third party app is to blame, you can start uninstalling apps individually. We suggest that you begin with the most recent ones you added.
  4. After you uninstall an app, restart the phone to normal mode and check for the problem.
  5. If your S9 is still problematic, repeat steps 1-4.

Factory reset

Ultimately, you need to do a factory reset if all the suggestions above won’t help at all. This will ensure that all software settings are returned to their defaults. If your S9 devices will charge normally and won’t have the slow performance issue after a factory reset, that means that there was either a software bug interfering with the operating system, or a bad app messed up with the system. After you factory reset your S9s, be sure to let them run for a few hours without adding any app. This should help you determine if there’s any difference.

To factory reset an S9:

  1. Create a backup of your data.
  2. Turn off the device.
  3. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  4. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  5. Press the Volume down key several times to highlight ‘wipe data / factory reset’.
  6. Press Power button to select.
  7. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  8. Press Power button to select and start the master reset.
  9. When the master reset is complete, ‘Reboot system now’ is highlighted.
  10. Press the Power key to restart the device.

Revert to previous Android Oreo version

This suggestion is only for Advanced Android versions. Rolling back Android to its previous version entails flashing, which means tampering with core system. If you haven’t heard of what flashing is or how to do it, we recommend that you stay away from it. Flashing can potentially brick your phone’s software for good if not done properly.

If you are an advanced user, flashing the original stock Android Oreo (the version that came with the device when you unboxed it) should probably fix whatever OS issues you’re having.

Photo of author


Harvey is keen with mobile technology and loves writing about all things mobile. He is passionate in helping technology-challenged people by finding resolution to their issues.

Posts you might like