Collision sensor stuck in Xiaomi device: causes and ways of elimination

Xiaomi’s modern smartphones and smart gadgets are equipped with drop and collision sensors that protect the device from damage from impacts. These sensors automatically lock the screen or turn off power if they detect a sudden movement or fall. But sometimes the sensor can jam, and the device starts to behave inappropriately: it spontaneously turns off, doesn't respond to touch, or it gives false positives, POCO Or another Xiaomi gadget suddenly stopped working normally, and errors of the type appear in the system logs. crash_sensor_fault or fall_detect_stuck, The problem is most likely to lie in the collision sensor.

In this article, we will explain why the collision sensor gets stuck in the “trigger” position, how to diagnose a problem without special equipment, and what to do to fix it – from simple software methods to physical repairs. You will also learn which Xiaomi models are most susceptible to such failures, and how to prevent re-jamming. If your device becomes strange after a fall or impact, do not rush to carry it to the service: in 70% of cases, the problem can be solved by yourself.

Reasons for the collision sensor jamming in Xiaomi

The collision sensor (or drop accelerometer) in Xiaomi devices can get stuck in an active state for several reasons, most often because of:

• 🔧 Physical damage after a fall or a heavy impact – the internal elements of the sensor are shifted.
• 💧 Moisture entering the body, which leads to corrosion of the sensor contacts.
• ⚡ Firmware failure when the sensor driver starts misinterpreting signals.
• 🔄 Conflict with other sensors (e.g., a gyroscope or barometer) due to firmware errors.
• 🛠️ Poor-quality repair, if previously disassembled the device and damaged the sensor plume.

Models with mechanically locking the screen when falling are particularly prone to this problem, such as the Xiaomi Mi 11 Ultra, Redmi Note 10 Pro or POCO F3. In these devices, the collision sensor is integrated into the main accelerometer, and its jamming can lead to complete inoperability of the touch screen before rebooting. Also often suffer smart watches Mi Band 6/7 and Xiaomi Watch S1, where the drop sensor is responsible for emergency calls.

Interestingly, in some cases, the sensor jamming can be false – for example, if the settings include the “Settings → Display → Accidental touch protection” function, which locks the screen when you move abruptly. Before panic, check if this option is activated.

How to diagnose a stuck collision sensor

Before you start repairing, you need to make sure that the problem is in the impact sensor, and not in another component.

1. Check the system logs. Connect the device to the PC and use it. ADB, To get the logs: adb logcat | grep -i "crash\|fall\|Sensor: If there are messages in the logs such as fall_detector: stuck at 1 or accelerometer_error, problem confirmed.
2. Sensor test. Install the Sensor Test or CPU-Z app and check the accelerometer readings. If the X/Y/Z values are unchanged or are frozen at the same level, the sensor is jammed.
3. Physical inspection. Carefully shake the device — if the sensor is triggered for the slightest movement (the screen is turned off or blocked), this is a sign of malfunction.

You can also use the service codes for diagnosis:

• Enter ##4636## → Go to Sensor Test.
• For models on MIUI 12+: ##6484## (sensor test).

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If your Xiaomi device suddenly stops responding to touches after a fall, try plugging it into charging for 10 to 15 minutes.

Software Ways to Resolve the Problem

If the sensor is stuck due to a software failure, try the following methods without disassembling the device:

1. Restart in Safe Mode

Press the power button and select Safe Mode Reboot, which turns off all third-party apps, which helps to detect a program conflict, and if the sensor is working normally, the problem is in one of the installed applications (most often in Google Fit, Mi Fitness or games with access to sensors).

2. Reset sensor settings

Go to Settings → Applications → Application Management → Three dots (menu) → Reset application settings. This will return factory settings for all sensors. After reset, restart the device.

3. Firmware update

Go to Settings → About Phone → System Update and check for updates. Some versions of MIUI had bugs with sensor drivers that were patched in subsequent updates. For example, the Redmi Note 9 Pro solved the problem after upgrading to MIUI 12.5.3.

Manual shutdown of the sensor (for advanced)

If you are confident in your actions, you can temporarily turn off the sensor via ADB:

adb shell settings put global fall_detector_enabled 0

Attention:

Check the backup of the data

Record the IMEI of the device

Make sure that the battery is >50%

Disable your Google account (if you plan to reset completely)-->

Physical repair methods (if software does not help)

If you don't reset and update your software, you'll have to use mechanical methods. It's important to understand that self-repairing can lead to a loss of warranty (if it's still valid).

1. Light tapping on the body

Place the device on a soft surface (like a towel) and gently tap on the back cover in the sensor area (usually near the main camera).

2. Heating with a hairdryer

Turn on the dryer at a minimum temperature (up to 50°C) and warm up the back of the device for 2-3 minutes. The heat can expand the internal components and return the sensor to its original position.

Disassembly and cleaning of contacts

If you have experience in disassembling equipment, you can try:

• 🔧 Carefully remove the back cover (this will require a plastic shoulder blade and a hair dryer to soften the glue).
• 🧹 Clean the contacts of the collision sensor with alcohol or a special liquid for electronics.
• 🔍 Check if the sensor plume has disconnected from the motherboard.

On Xiaomi Mi 10 and newer models, the collision sensor is often located next to the vibrator. If you see the plume moving away during the disassembly, gently plug it back in, but don't press it too hard to damage the contacts.

Xiaomi models most affected by the problem

Analysis of service centers shows that most often the collision sensor gets stuck in the following devices:

If your model is on this list, try software methods first (update, reset). For the Mi Band and Xiaomi Watch, full discharge and subsequent charging often helps - this resets the sensor controller.

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In 90% of cases, the problem with the collision sensor in Xiaomi smartphones is solved software, physical repair is required only for mechanical damage or moisture.

What do you do if nothing helps?

If all of these methods have not worked, there are two options:

1. Official Xiaomi centers in Russia and the CIS will replace the sensor under warranty, if the problem is not caused by mechanical damage. The average repair period is 3-5 days. Cost without warranty: For smartphones: 2000-4000 rubles. For smart watches: 1500-2500 rubles.

Turn off the sensor permanently

ADB

Magisk

squash

If you decide to turn off the sensor, use the command:

adb shell pm disable com.miui.fallprotection

After that, the device will cease to respond to shocks, but the protection of the screen when falling will also turn off.

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Before visiting the service center, back up your data via Mi Cloud or Xiaomi PC Suite. After the repair, you may need to reset your settings.

How to prevent sensor jamming in the future

To avoid repeated problems with the collision sensor, follow these guidelines:

• 🛡️ Use a depreciation case (e.g. Xiaomi Original Protective Case) to reduce the load on the sensor when falling.
• 🚫 Avoid sudden temperature changes – do not leave the device in the cold or in direct sunlight.
• 🔋 Don't drain the battery to 0%. When you're in deep discharge, your sensor settings may be lost.
• 💦 Protect yourself from moisture, even if your device is protected. IP53, Water ingestion can cause corrosion of sensor contacts.
• 🔄 Update the software regularly. In new versions MIUI Frequently fix bugs with sensor drivers.

For smartwatches, Xiaomi is additionally recommended:

• Remove the bracelet before showering or swimming (even if it has 5 ATM protection).
• Once a month, wipe the contacts of charging and sensors with an alcohol napkin.

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The collision sensor in Xiaomi devices is designed to be 50,000-100,000 positives. If your gadget crashes frequently, consider replacing it before this limit expires.

FAQ: Frequent questions about the collision sensor in Xiaomi