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G-Sensor Dash Cams: How Impact Detection Really Works

A G-sensor detects changes in acceleration and can mark a recording for protection. Correct sensitivity matters because potholes can create unwanted locked files.

A G-sensor dash cam measures acceleration and can lock the current clip when it detects a sudden event. That helps prevent ordinary loop recording from overwriting a marked file, but it does not prove what caused the movement.

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Dash Cam Motion Sensors and Parking Recording…

Common questions

Questions before you buy

What is a G-sensor in a dash cam?

It is an accelerometer that detects changes in motion. Dash cam software can use the reading to mark or protect a video clip.

What G-sensor sensitivity should I use?

Start with the manufacturer's normal or medium setting, then adjust if routine bumps lock too many clips or meaningful events are missed.

Does a G-sensor work when the car is parked?

Only when the camera has power and supports an appropriate parking mode. The sensor itself does not keep the camera powered.

Why does my dash cam keep saying the card is full?

Excessive protected clips can consume reserved storage. Review the event folder, reduce sensitivity if appropriate and format the card using the manufacturer's process after saving needed footage.