If you've been shopping for a dash cam, you've probably seen the term G-Sensor listed as one of the key features. Almost every modern dash cam includes one, but many drivers aren't sure what it actually does—or why it matters.
Is a G-Sensor the same as Parking Mode? Does it record accidents automatically? Can it prevent important footage from being deleted?
The short answer is yes, a G-Sensor plays a critical role in protecting your recordings, but it works differently from many people expect.
In this guide, we'll explain what a G-Sensor is, how it works, how it interacts with Loop Recording and Parking Mode, and why it's an essential feature in every modern dash cam.
What Is a G-Sensor in a Dash Cam?
A G-Sensor (Gravity Sensor) is a built-in motion sensor that measures sudden changes in acceleration or movement. In technical terms, it's a three-axis accelerometer that monitors movement along the forward/backward, left/right, and up/down axes.
When the sensor detects an impact or an unusually strong force, it automatically tells the dash cam that an important event has occurred.
Instead of allowing the current recording to be overwritten during Loop Recording, the dash cam saves the video as a protected emergency file.
This ensures that crucial footage is preserved if you're involved in an accident.
How Does a G-Sensor Work?
During normal driving, your dash cam continuously records video and saves it in short clips.
The G-Sensor constantly monitors vehicle movement in the background.
If it detects sudden acceleration or deceleration beyond a preset threshold, it immediately triggers an emergency recording event.
Typical situations that can activate the G-Sensor include:
- Vehicle collisions
- Rear-end impacts
- Hard braking
- Sudden swerving
- Strong vibrations
- Significant bumps or impacts while parked
Once triggered, the dash cam automatically locks the current recording and often protects a short period of footage recorded immediately before and after the event.
This helps preserve the complete sequence of what happened.
What Happens After an Impact?
When the G-Sensor detects an impact, the dash cam automatically:
- Marks the current recording as an emergency event.
- Locks the video file.
- Prevents the file from being overwritten by Loop Recording.
- Continues recording new footage separately.
This process happens automatically without any action from the driver.
As a result, important evidence remains available even after days or weeks of normal driving.
How Does a G-Sensor Work with Loop Recording?
Loop Recording and the G-Sensor work together.
Loop Recording continuously records your journey by overwriting the oldest unlocked files when the memory card becomes full.
The G-Sensor ensures that important videos are excluded from this process.
Without a G-Sensor, valuable accident footage could eventually be overwritten once the storage card reaches capacity.
Together, these features allow the dash cam to record continuously while protecting critical evidence.
G-Sensor vs Parking Mode: What's the Difference?
Many first-time buyers confuse the G-Sensor with Parking Mode, but they serve different purposes.
| G-Sensor | Parking Mode |
|---|---|
| Detects impacts and sudden movement | Monitors your vehicle while parked |
| Automatically locks emergency recordings | Records incidents when the vehicle is unattended |
| Works during normal driving | Operates after the engine is turned off |
| Prevents important footage from being overwritten | Requires continuous power, typically through a hardwire kit |
In many dash cams, these two features work together.
For example, while your vehicle is parked, Parking Mode keeps the camera ready to record. If another vehicle bumps your car, the G-Sensor can detect the impact and ensure the resulting footage is protected.
Can You Adjust G-Sensor Sensitivity?
Yes.
Most dash cams allow you to choose different sensitivity levels.
Typical options include:
- Low – Best for rough roads or off-road driving, reducing unnecessary event recordings.
- Medium – A balanced setting suitable for most daily driving.
- High – Detects even minor impacts but may also trigger on potholes, speed bumps, or aggressive braking.
Choosing the right sensitivity helps reduce false event recordings while ensuring genuine collisions are captured.
Does Every Dash Cam Have a G-Sensor?
Most modern dash cams include a built-in G-Sensor, but not all models offer the same level of customization.
Entry-level cameras may simply lock videos after detecting a significant impact.
More advanced models often allow users to adjust sensitivity and integrate the G-Sensor with Parking Mode and emergency recording features.
When comparing dash cams, it's worth checking whether the camera offers adjustable sensitivity and supports protected event recording.
Why Is a G-Sensor Important?
A G-Sensor provides several practical benefits.
It helps:
- Protect accident footage automatically.
- Prevent important recordings from being overwritten.
- Simplify insurance claims.
- Preserve evidence after hit-and-run incidents.
- Record unexpected impacts while driving.
- Support Parking Mode by identifying collision events.
Without a G-Sensor, drivers would need to manually save important recordings, which isn't always possible during an emergency.
Which GKU Dash Cam Includes a G-Sensor?
The GKU E200 includes a built-in G-Sensor as part of its comprehensive safety feature set.
It also offers:
- 4K front recording
- Full HD rear recording
- Sony STARVIS 2 front sensor
- HDR image processing
- GPS logging
- 5.8GHz Wi-Fi connectivity
- Voice control
- Parking Mode support (with a compatible hardwire kit)
These features work together to help capture, protect, and manage important recordings before, during, and after an incident.
Frequently Asked Questions
What does a G-Sensor do in a dash cam?
A G-Sensor detects sudden impacts or changes in vehicle movement and automatically locks the current recording so it won't be overwritten.
Does a G-Sensor record accidents automatically?
The dash cam is already recording continuously. The G-Sensor doesn't start recording—it identifies significant events and protects the relevant footage.
Can I turn the G-Sensor off?
Many dash cams allow you to disable the G-Sensor or adjust its sensitivity, although leaving it enabled is generally recommended for better protection.
Does the G-Sensor work while the car is parked?
Yes, if your dash cam supports Parking Mode and receives continuous power through a compatible hardwire kit or another suitable power source.
Does a G-Sensor stop Loop Recording?
No. Loop Recording continues to function normally, but files locked by the G-Sensor are excluded from automatic overwriting.
Why does my dash cam lock videos on speed bumps?
The G-Sensor sensitivity may be set too high. Lowering the sensitivity can reduce unnecessary event recordings caused by potholes or rough roads.
Is a G-Sensor necessary?
For most drivers, yes. It's one of the most important safety features because it automatically protects critical footage without requiring any manual action.
Final Thoughts
Although it's a small component, the G-Sensor plays a major role in ensuring your dash cam captures reliable evidence when it matters most.
By detecting sudden impacts, locking emergency recordings, and working alongside Loop Recording and Parking Mode, it helps safeguard the footage you may need for insurance claims, police reports, or accident investigations.
When choosing a dash cam, don't focus solely on resolution or image quality. Features like the G-Sensor, Parking Mode, GPS, and reliable Loop Recording are equally important for delivering complete protection on the road.
Continue Learning
- Dash Cam Buying Guide 2026
- How Does a Dash Cam Work?
- What Is Loop Recording?
- What Is Parking Mode?
- Buffered vs Time-Lapse Parking Mode
- Dash Cam Installation Guide
- Dash Cam Video Quality Guide