What is DiagMonAgent and Why Does It Keep Stopping?

If you’re using a Samsung device with Android OS then you might have come across the DiagMonAgent system app. You are not sure whether it’s bloatware like the KLMS agent, a virus, spyware, or an important system application.

In this article, I’ll explain everything about DiagMonAgent, whether it’s necessary for your device, why does it keep stopping and how to fix DiagMonAgent keeps stopping issue.

What is DiagMonAgent?

DiagMonAgent or Diagnostic Monitor Agent is a pre-installed system application on Samsung devices with the Android OS. Its main function is to monitor installed and running applications on your device for malfunctions and send the diagnostic reports to developers.

A lot of people are concerned that the DiagMonAgent is bloatware which you normally find in most Samsung devices but that is not the case here. DiagMonAgent is not bloatware. Instead, it is a system application that’s constantly monitoring your device for issues and malfunctions.

Every Android app has a unique application ID that is represented with a package name. The application ID of DiagMonAgent is com.sec.android.diagmonagent.

Is DiagMonAgent a Virus, or Spyware?

No, DiagMonAgent is not a Virus or Spyware. It is a totally safe application that is already installed on your Samsung Android device to check for issues and malfunctioning apps. It doesn’t cause any harm to your device and it doesn’t spy on your data.

It only sends diagnostic information about malfunctions and issues on your device to developers so that they can fix these issues in the next system update.

What Permissions Does DiagMonAgent Use?

DiagMonAgent only uses Telephone permission which allows this app to modify phone state, read phone status and identity. You cannot deny this permission because it’s a necessary permission for the app to operate.

DiagMonAgent app permissions

How to see all permissions for DiagMonAgent?

You can check all the permissions required by DiagMonAgent using the steps below.

Step 1 – Open the Settings app on your Android device.

Step 2 – Tap on Apps.

Step 3 – Tap on the Ellipsis icon (three vertical dots) in the top right corner.

Step 4 – Tap on Show System apps.

Step 5 – Search for DiagMonAgent in the search bar and tap on it.

Step 6 – Scroll down and tap on Permissions.

What does DiagMonAgent do? (Functions of DiagMonAgent)

DiagMonAgent is a very important app because its main job is to monitor all the installed and running applications for malfunctions and other issues. If it detects any issues then it sends the diagnostic information to developers.

Some other functions of DiagMonAgent are mentioned below.

(1) DiagMonAgent allows users to examine their phone’s Display with the primary color buttons. It allows users to check if their display is showing all the colors properly.

(2) You can also check your device’s Receiver using DiagMonAgent. All you have to do is start the Receiver test, speak something and it is fed back to the user to confirm if the Receiver is working properly.

(3) It provides the users with a Vibration test where they can check if their phone is vibrating when the vibration mode is enabled.

(4) DiagMonAgent also allows you to test the sensors on your device like Fingerprint, Accelerometer, Proximity, Lights, Gyroscope, Magnetic, etc.

You can check all the tests performed on your smartphone by dialing *#0*# on your phone’s dialer.

What Issues does DiagMonAgent cause?

The two biggest issues that DiagMonAgent causes are:

(1) DiagMonAgent Has Stopped Working Message

The “DiagMonAgent has Stopped” issue is the most well-known issue on Samsung devices especially the Samsung Galaxy S6. This message notification appears randomly and it can be really annoying when you’re doing some important tasks on your smartphone.

The “DiagMonAgent has stopped working” message appears because of Cache files. These cache files are the main source of errors and problems in the functioning of Apps.

Another reason why this message can appear is due to low memory. This happens only on devices with very low RAM. Most modern devices come with a decent amount of RAM so the main reason for this issue on modern Android devices is Cache files.

You can fix this issue by clearing the DiagMonAgent app cache data. I have explained how to do this in this article so you can read that and use it. If this method doesn’t work then don’t worry because I have also provided some other methods that should work.

(2) Sending Report Notification After Turning on Wi-Fi

Once you turn on your Wi-Fi, the notification bar on your device shows “sending report.” This is because DiagMonAgent is trying to send diagnostic reports to developers. This problem is seen on Samsung devices running on Android 5.0 and above versions.

The exact reason for this is that the DiagMonAgent app is configured to send your device’s diagnostic report periodically and it can do it only when it has access to Wi-Fi. So, when you turn on your Wi-Fi, it tries to send the diagnostic report and that’s why you see the sending report” message in your notification bar.

This is really annoying because every time you turn on your Wi-Fi, you see this message appearing. If you are also getting these issues then you can try the methods mentioned below to fix them.

How to Fix DiagMonAgent Has Stopped Working issue?

The best way to fix this issue is by clearing the DiagMonAgent App Cache data. If this doesn’t work then you can try to Force Stop the app. If both these methods don’t work then you can try to uninstall this app or factory reset your device. All of the methods are mentioned below in detail.

(1) Clear DiagMonAgent App Cache data

Follow the steps below to clear the DiagMonAgent app cache data.

Step 1 – Go to Settings.

Step 2 – Tap on Apps.

Step 3 – Tap on the Ellipsis icon (three vertical dots) in the top right corner.

Step 4 – Tap on Show System apps.

Step 5 – Search for DiagMonAgent and then tap on it.

Step 6 – Tap on Storage.

Step 7 – Tap on the “Clear Cache” option.

This should solve the problem but in case it doesn’t then you have to either force stop the app or factory reset your phone. Here are the steps for both.

(2) Force Stop the DiagMonAgent App

You can Force Stop this app by following the steps mentioned below.

Step 1 – Go to Settings.

Step 2 – Tap on Apps.

Step 3 – Tap on the Ellipsis icon (three vertical dots) in the top right corner.

Step 4 – Tap on Show System apps.

Step 5 – Search for DiagMonAgent in the search bar and then tap on it.

Step 6 – Tap on the “Force Stop” option.

(3) Factory Reset your Android Phone

Before you think of factory resetting your phone you should back up all your data. After backing up, you can follow the instructions below to perform Factory Reset.

Step 1 – Go to Settings.

Step 2 – Tap on General Management.

Step 3 – Tap on Reset.

Step 4 – Tap on Factory Data Reset.

Step 5 – Tap on the “Reset” button and you may need to enter your PIN or password.

Step 6 – Tap on Delete all and your phone will be reset.

(4) Uninstall the DiagMonAgent app

If the above methods didn’t work for you then you can uninstall the DiagMonAgent app using the methods mentioned below.

How to Uninstall the DiagMonAgent app?

The DiagMonAgent app comes preinstalled on Samsung Android devices and does not offer an option to uninstall the app directly, but you can uninstall this system app using either the System App Remover application or using the Android Debug Bridge (ADB).

Uninstall DiagMonAgent using ADB

ADB is a command line tool that is used to communicate with a device running on the Android OS. ADB allows you to bring up a Unix shell so you can issue commands directly on the Android device. You can use it to uninstall the DiagMonAgent app permanently. You’ll need a Windows PC to use ADB.

Here are the steps to uninstall DiagMonAgent using ADB.

Step 1 – Go to Settings > System > About phone

Step 2 – Tap on the Build number 7 times to activate Developer Options.

Step 3 – Go back to the main Settings menu and tap on Developer Options to open it.

Step 4 – Enable USB debugging by tapping on it.

Step 5Download ADB on your PC.

Step 6 – Extract the ZIP file into a folder.

Step 7 – After extracting the ZIP file, open that folder.

Step 8 – Press and hold the shift button and right-click in a blank area.

Step 9 – Click on “Open Powershell window here.”

Step 10 – Enter the command adb devices

Step 11 – Connect your Android device to the PC using a USB data cable. 

Step 12 – Type the command adb shell pm uninstall –user 0 com.sec.android.diagmonagent and press Enter to run this command. Wait for a few seconds and you’ll notice the app has been uninstalled from your device.

Note – If you want to disable the app instead of uninstalling it, you need to replace “uninstall” with “disable” in Step 12 of the adb command shown above.

Uninstall DiagMonAgent Using System App Remover

This method requires you to gain root access to your device. If you don’t know how to root your Android device then check our Android Root guide.

After gaining root access follow the steps below to uninstall DiagMonAgent.

Step 1 – Download and install the System App Remover application.

Step 2 – Launch the System App Remover application, type DiagMonAgent in the Search barand tap the checkmark box next to the app.

Step 3 – Tap on the Uninstall button to completely uninstall the app and delete its data.

Is It Safe to Uninstall DiagMonAgent?

Yes, it is safe to uninstall the DiagMonAgent app but you should only uninstall it if clearing the app cache data method or the Force Stop method didn’t work.

It is not a good option to uninstall system apps because they are required for the proper functioning of the device and removing them may cause some issues with your device.

If all of the above methods didn’t work out for you then you can try to flash the stock Firmware instead of uninstalling the app. Flashing the Stock Firmware will totally fix the issue and the best part is that you can do it yourself using firmware flashing tools. If you’re using a Samsung device then you should use the Samsung Odin flashing tool.

Here is a video that shows how to flash Stock Firmware on Samsung smartphones using the Samsung Odin flashing tool.

Conclusion

DiagMonAgent is a pre-installed system app on Samsung Android devices that monitors installed and running applications on your device for malfunctions and sends the diagnostic reports to developers. It is not a virus or spyware.

DiagMonAgent has a noticeable issue where people get a message “DiagMonAgent has Stopped.” You can fix this issue by clearing your app cache data or by force stopping the app. If these methods don’t work then you can try uninstalling the app, factory resetting the device, or flashing the stock firmware.

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