What Is G Sensor in Dash Cam?


When searching the market for the perfect dash cam, there is one feature that stands out, which is a G sensor. Well, despite the regular essential functions of the gadget, a dash cam without a built-in G sensor is pretty much useless. 

The good news is that most cameras have the sensor, but many people need to become more familiar with it and what it does. The G or Gravity sensor, also known as an accelerometer, can detect the magnitude of acceleration and can be found in many industrial products.

Continue reading as we explain what is G sensor in dash cam, how it works, and what its benefits are. 

What Is G Sensor in Dash Cam

What Is G Sensor in Dash Cam? 

The gravity sensor in the dash cam detects any unexpected movement around the vehicle. This could be someone crashing your car while parked, a severe accident, shock from collision, and multiple other scenarios. The sensor has many names and, on the market, can be found as a gravity sensor, accelerometer, or G-Force. In other words, when there is a sudden change of direction, the dashboard camera with a built-in sensor will be able to detect it. 

When the camera senses any change of direction like a collision, forceful braking, or shaking, it enters “event mode,” which is a stage where the recording starts and saves the present footage in a secure memory location. The saved footage depends on the model of the dash cam. Most dashboard cameras start 10 seconds before the movement and continue to record for a whole minute. This means the point of impact is captured for later viewing.

Read More: How Does Loop Recording Work on a Dash Cam

Also, you can customize the gravity sensor’s sensitivity and the recording period to match your personal needs. 

How does a dash cam with a built-in G sensor work? 

The digital rearview mirror captures the footage when the G sensor detects an impact. It stores it in a standalone file which can later be downloaded and examined for any further evidence. The responsiveness level of the sensor has three levels: low, medium, and high. You can set the sensitivity based on the driving conditions in the camera’s settings menu. 

If you drive cross country, you can set the level of responsiveness to very low because you do not want footage of every bump. Once any accident or collision occurs, you can see the footage directly on the digital screen, or for much better viewing, take out the SD card and upload the file to a computer. 

The purpose of the G sensor in a dash cam

Now that we have explained what is G sensor in dash cam, let’s talk a little about its purpose. The gravity sensing function is a feature of the G sensor. The system can record the data and decide based on the ambient down, front and back offset, left and right, and up and down. 

The gravity sensing is connected to the vehicle’s dash cam for the driving recorder. When something unexpected happens, for example, a collision or shaking, the dashboard camera will quickly lock the video footage for later viewing. 

Lastly, the video evidence is maintained and safely kept. 

Also more: Can Dash Cams Be Hacked?

What Moments Does a Dash Cam With G Sensor Detect? 

A dash cam with a G sensor has impact and motion detection. Something worth mentioning is that only the more expensive models have these features. 

The impact detection is activated internally. It involves recording a video file when the motion detects something; on the other hand, captures a scenario in video file form when a movement triggers it. 

The combination of these features will keep your vehicle safeguarded, and if any damage occurs, with a G sensor dash cam, you have a reliable witness for the court. 


Hopefully, now you know what is G sensor in dash cam and its purpose. If you search the market for a dashboard camera, ensure the gravity sensor is built so you can record live footage of bumps, crashes, and bruises. A dash cam with a G sensor can be a great addition to your car in traffic and when parked unattended.