Why Xiaomi is powered by Bluetooth: 7 reasons and how to fix it

Have you noticed that your Xiaomi, Redmi or POCO Bluetooth turns on on its own without you? It's a common problem that can drain the battery, create security vulnerabilities or just annoy you with constant notifications. Most of the time, it's not hardware malfunctions that are to blame, but software failures, background processes or incorrect settings.

In this article, we will take a closer look at all the possible causes of spontaneous Bluetooth activation on Xiaomi devices, from the banal MIUI errors to the hidden features of smart devices, how to diagnose a problem, which settings to check first, and what to do if standard methods do not help, and at the end, you will find an FAQ with answers to the most frequent user questions.

Let’s note right away: if your smartphone turns on Bluetooth exclusively when connecting to a charger or in a car, this may be due to the Auto Connect to the car function – we will also disassemble it separately.

1. Background applications and auto-run

The most common reason is apps that automatically turn on Bluetooth for their needs, such as instant messengers (such as Telegram for file transfer), fitness trackers (Mi Fit, Zepp), smartwatches, or even games with support for gamepads. In MIUI, many applications are automatically authorized to run and work in the background by default.

How to check:

• 🔍 Open the Settings. → Annexes → Application management and sort by Auto Start section.
• 📱 See the list of applications with Bluetooth resolution in Settings → Annexes → Permits → Other permits.
• 🔄 Pay attention to apps that have recently been updated – they may have received new permissions.

What to do:

• ❌ Turn off auto-run for suspicious apps (especially if you don’t use them).
• 🚫 Disable Bluetooth access for unnecessary programs in the Permissions section.
• 🔄 Restart your phone after changes – some processes may remain active until reboot.

⚠️ Note: Some system applications (such as Mi Share or Google Play Services) may turn on Bluetooth again after the update. If the problem comes back, check the update log in Settings → The phone. → Updating the system.

2. the function "Auto-connection to the car"

Many users are unaware that MIUI has a hidden auto-connect to car feature that automatically turns on Bluetooth when a familiar car radio or hands-free system is detected, an option that is activated after the first manual connection and can work even if you haven’t been driving in a long time.

How to turn it off:

1. Go to Settings → Connections and Sharing → Bluetooth.
2. Click on the three dots in the upper right corner and select Auto Connect to the car.
3. Turn off the slider or remove saved devices from the list.

If this item is not in your MIUI version, try an alternative path:

Settings → Special features → Smart features → Autoconnection to the car

💡

After disabling this function, check whether Bluetooth is turned on when connecting to charging - sometimes the trigger is the start of charging, and not the connection to the machine itself.

3. Failures in the firmware MIUI or Android

If the problem occurred after the system update, it may be a firmware bug, especially for devices on MIUI 12.5-14, where users have complained about the spontaneous switching on of Bluetooth and Wi-Fi.

• 🐛 Conflict between Bluetooth modules and energy saving.
• 🔄 Incorrect updates (for example, if the process is interrupted).
• 📱 Residual files from the previous firmware version.

Decisions:

• 🔄 Reset network settings: Settings → SIM-maps and mobile networks → Resetting network settings.
• 📲 Clear the Bluetooth partition cache: Settings → Annexes → Application management → Three points. → Show system-based → Bluetooth → Clear the cache.
• 🔧 Reverse to the stable version MIUI (if you use beta firmware).

4.Smart devices and accessories

If you use a smartwatch, headphones, fitness bracelets or other Xiaomi gadgets, they can automatically initiate a Bluetooth connection.

• 🎧 Xiaomi Buds or Redmi AirDots when opening the case cover.
• ⌚ Mi Band or Xiaomi Watch when syncing data.
• 💡 Smart lamps Yeelight or Aqara when set up.

How it works:

Many Xiaomi devices use the FastConnect protocol, which speeds up the connection but sometimes leads to unwanted activation of the module. For example, if you wear the Mi Band next to your phone, it can periodically wake up Bluetooth to synchronize steps.

Decisions:

Turn off autoconnection in headphone settings |Remove unnecessary devices from the list of conjugates |Update the firmware of gadgets through Mi Home |Opact background synchronization in Mi Fit

-->

⚠️ Note: Some smart devices (e.g. Xiaomi Smart Door Lock) require a permanent Bluetooth connection to operate the key.

5. Viruses and malware

Rarely, but possible: malicious applications may include Bluetooth to transfer data or connect to other devices, especially at risk for users who install APKs from unverified sources or use hacked versions of programs.

Signs of infection:

• 📱 Bluetooth is enabled even in Flight Mode (if it only disables the mobile network).
• 🔋 Battery discharge without apparent cause.
• 📡 Unknown devices in the history of Bluetooth connections.

What to do:

1. Install an antivirus (such as Dr.Web or Kaspersky) and scan the system.
2. Check the list of installed applications for suspicious ones (especially with administrator rights).
3. If nothing helps, reset to factory settings (don’t forget to make a backup!).

Hardware malfunctions

If all software methods do not help, the problem may lie in the hardware:

• 🔌 Damage to Bluetooth module (for example, after falling or getting moisture).
• 🔋 Battery malfunction that causes false controller positives.
• 📶 Antenna problems (often occurring after unqualified repairs).

How to diagnose:

Connect the phone to the computer and check the system logs through ADB (Look for bugs like BluetoothAdapter: STATE_ON caused by bt_stack.conf. If there are many records of module failures in the logs, this is an excuse to contact the service center.

Provisional decision:

You can disable the Bluetooth module completely through the engineering menu (but this will deprive you of the ability to use wireless accessories).

Enter the dialer in ##4636##


Go to “Phone Information” → “Bluetooth” → “Disable”

💡

If the phone is warranty, don’t try to repair it yourself. Contact Xiaomi’s official service, as hardware malfunctions may worsen.

Energy conservation and optimization

Paradoxically, sometimes Bluetooth is turned on because of its power-saving features, and MIUI has an option called the Adaptive Battery, which can activate communication modules to "optimize" the work, and it can also be the fault of:

• 🔋 Supersaving mode (enables Bluetooth to synchronize time).
• ⚡ Smart Awakening (Wakes up modules for notifications).
• 📊 Analytics MIUI (collects connection data).

How to turn it off:

1. Go to Settings → Battery and Performance → Battery Modes.
2. Choose Performance over Balanced or Saving.
3. Turn off the Adaptive Battery and MIUI Optimization in additional settings.

If you get a bigger battery after that, you can put your settings back and accept the occasional Bluetooth switch on, which is the lesser evil of quick discharge.

FAQ: Frequent questions