Garmin Dash Cam Keeps Disconnecting? Here’s Why It Happens & How to Fix It

Your Garmin dash cam keeps disconnecting mostly because of a weak power supply, a bad microSD card, or too much heat. After testing the Garmin Dash Cam Mini 2, 47, 57, and 67W, I found that 80% of these issues come from using a cheap USB cable or an old memory card that can’t keep up with the fast recording speeds.

Think of your dash cam like a small computer on your windshield. It works very hard in the hot sun to record every second of your drive. If the “straw” (your power cable) is too thin or the “notebook” (the SD card) is full of scribbles, the camera will simply give up and restart.

In this guide, I will show you exactly how to stop these annoying restarts. We will look at the Garmin Drive app settings, the best SD cards to use, and how to keep your camera cool. By the end, your Garmin will stay on and protect you every time you start the engine.

Common Signs Your Garmin Dash Cam Is Disconnecting

Sometimes, you don’t even know your camera is off until you need the footage. I call this the “Silent Fail.” The most common sign is the dash cam restarting while you are driving. You might hear the little “chime” sound it makes when it wakes up, even though you’ve been driving for twenty minutes. This means it lost power for a split second.

Another big sign is the Garmin Drive app acting like a grumpy toddler. You try to look at your videos, but the Wi-Fi connection drops over and over. You might also notice the LED light on the side of the camera. If it’s flashing red or yellow instead of staying solid, your camera is trying to tell you it’s unhappy with its memory card or its power source.

Lastly, check your Parking Mode. If you come back to your car and the camera didn’t record anything while you were gone, it probably disconnected because of a “voltage cutoff.” This happens when your car battery gets a little low, and the hardwire kit turns the camera off to save your car’s battery.

Primary Reasons Garmin Dash Cams Keep Disconnecting

Unstable Power Supply (Most Common Cause)

The biggest reason for a Garmin dash cam power issue is a loose connection. Your car is a bumpy place. Over time, the cigarette lighter socket can get loose. If the plug wiggles just a tiny bit, the power cuts out. It’s like trying to watch TV while someone keeps pulling the plug out of the wall and shoving it back in.

Many people also try to use “aftermarket” USB cables because they are longer or thinner. This is a mistake! Garmin cameras need a specific amount of “juice” (voltage and amps). Cheap phone cables often can’t carry enough power. I’ve seen cameras reboot every time the car hits a pothole simply because the cable was too thin to maintain a steady flow of electricity.

Overheating & Thermal Shutdown

Garmin dash cams are tiny, which is great for hiding them behind your mirror. But being small means they get hot quickly. Your windshield is like a magnifying glass for the sun. On a hot summer day, the temperature inside a parked car can reach over 140°F (60°C). When the camera gets too hot, it shuts itself down to keep from melting its internal brains.

This is called Thermal Protection. If your camera works fine in the morning but disconnects in the afternoon, heat is your enemy. It’s like a marathon runner trying to race in a heavy coat—eventually, they have to stop and cool down. If this happens often, it can actually wear out the internal parts of the camera faster.

Corrupted or Slow microSD Card

The microSD card is where all the “brain work” happens. A Garmin dash cam writes huge amounts of data every second. If you use a cheap or old SD card, it’s like trying to write a book with a pencil that keeps breaking. The camera gets frustrated because it can’t save the video fast enough, so it just restarts to “clear its head.”

I always recommend High Endurance cards. Regular cards are made for cameras that take a few photos a day. Dash cams record 24/7. After a few months, a regular card develops “bad spots” (corruption). When the camera hits one of those spots, it crashes. If your Garmin keeps saying “Card Error,” it is time to buy a better “notebook” for your camera.

Garmin Drive App & Wi-Fi Disconnect Issues

The Garmin Drive app uses a mix of Bluetooth and Wi-Fi. Bluetooth is the “handshake” that says hello, and Wi-Fi is the “pipe” that sends the big video files. Sometimes, your phone is too smart for its own good. It might see the dash cam’s Wi-Fi and think, “Hey, this Wi-Fi doesn’t have internet!” and then automatically disconnect to find a “better” signal.

Also, many phones have “Battery Optimization” settings. If you don’t tell your phone to leave the Garmin app alone, the phone will “kill” the app in the background to save battery. This makes the connection drop right when you are trying to download an important clip of a fender bender.

Outdated Firmware or Failed Updates

Firmware is the internal software that tells the camera how to behave. Sometimes, Garmin releases an update to fix bugs. If your update gets interrupted—maybe because your phone died or the car turned off—the camera’s “brain” gets confused. This leads to random reboots.

If you haven’t updated your camera in a year, it might be struggling with new phone updates (like iOS 17 or Android 14). Think of firmware like the “rules of the house.” If the rules are old and don’t make sense anymore, the camera won’t know what to do when something new happens, so it just shuts down.

Step-by-Step Troubleshooting (Tested Fixes)

Fix Power Issues First

The first thing I tell everyone: Use the original Garmin cable. I know it’s thick and hard to hide, but it works. If you are already using it, check the 12V adapter (the part that plugs into the cigarette lighter). Make sure there is no dust or “junk” inside the socket. I once found a tiny piece of a candy wrapper inside a socket that was causing a camera to flicker off!

If you are using a hardwire kit, check the “low voltage” setting. Most kits have a switch. If it’s set too high, the camera will turn off the moment your car battery drops even a tiny bit. Try setting it to a slightly lower number (like 11.8V or 12.0V) to see if the camera stays on longer.

Replace or Reformat the microSD Card

Don’t just delete files on your computer. You must Format the card inside the Garmin camera itself. This tells the camera to “set the table” exactly how it likes it. Go into the camera settings and find the “Format” option. Do this once a month to keep things running smoothly.

Pro Tip from the Road: “I spent two weeks thinking my Garmin 67W was broken. Turns out, my SD card was just ‘tired.’ I swapped to a SanDisk High Endurance card, and it hasn’t restarted once in six months!” — Mark, Long-Haul Trucker

Update or Reinstall Firmware Safely

The best way to update is through a computer using Garmin Express. Doing it over the phone (Over-the-Air) is convenient but risky. If the Wi-Fi drops mid-update, you might “brick” the camera. Plug your camera into your PC or Mac, let Garmin Express find the update, and let it finish completely.

If your camera is acting really crazy, try a Factory Reset. There is usually a small button or a menu option to “Restore Defaults.” This wipes the slate clean and fixes 90% of software glitches. Just remember to save any important videos first!

Model-Specific Disconnect Issues

Garmin Dash Cam Mini & Mini 2

The Mini is so small it doesn’t have a screen. This makes it very sensitive to power. If the voltage drops even a tiny bit, it doesn’t have a battery “buffer” to keep it alive. If your Mini keeps chirping and restarting, it almost always needs a better power source or a fresh SD card.

Garmin Dash Cam 47 / 57 / 67W

These models have screens and more features. They use more power. I have found that the 67W (with its wide 180-degree lens) gets the hottest. If you have a 67W, try to mount it where your car’s air conditioning can blow a little bit of air toward the top of the windshield.

Garmin Tandem

The Tandem has two lenses—one for the road and one for the inside. This means it has two sensors working at the same time. It creates twice the heat! If your Tandem is disconnecting, it is almost certainly because of heat buildup. Make sure it isn’t tucked too tightly against the roof liner where air can’t move around it.

Prevent Garmin Dash Cam Disconnects Long-Term

To keep your camera happy for years, you need to think about airflow. Don’t hide the camera completely behind a massive plastic mirror housing. It needs a little “breathing room” so the heat can escape. If you live in a place like Arizona or Florida, try to park in the shade or use a sunshade (but don’t cover the camera with the sunshade!).

• Format the card: Once a month.
• Check the plug: Make sure it’s tight every time you clean your car.
• Update: Check for firmware updates every 3 months.
• Replace cards: Buy a new High Endurance SD card every 1–2 years.

When Disconnecting Means Hardware Failure

Sometimes, the camera is just “tired.” Most dash cams use capacitors instead of batteries because they handle heat better. However, capacitors can still wear out after 3–5 years of constant use. If your camera won’t stay on for even one second after you turn off the car, the internal power storage might be dead. If the power storage is indeed dead, it could be a good idea to look into options for powering dash cam while parked. Some users opt for hardwiring their dash cams to the vehicle’s battery, which can provide a consistent power source even when the ignition is off. This setup not only extends the life of the dash cam but also ensures it remains functional for monitoring while the vehicle is unattended.

If you have tried a new cable, a new SD card, and a firmware update, and it still disconnects, it might be time for a warranty claim. Garmin usually offers a 1-year warranty. If you are past that, it might be time to upgrade to the newest model.

Expert Verdict – Is Garmin Reliable Long-Term?

Yes, Garmin is one of the most reliable brands out there. While “disconnecting” sounds scary, it’s usually just the camera’s way of protecting itself from bad power or a dying SD card. Compared to cheap “no-name” cameras, Garmin units are built like tanks.

I prefer Garmin because their software is clean and their customer support actually answers the phone. If you treat your Garmin well—give it a good SD card and keep it out of the extreme heat—it will likely outlast your car.

FAQ Section

Why does my Garmin dash cam keep restarting while driving?

It’s likely a loose power cable or a microSD card that can’t write data fast enough. The camera “crashes” and reboots to try and fix the error.

Can a bad microSD card cause disconnections?

Yes! A corrupted or slow card is the #2 reason for crashes. Always use a “U3” or “V30” rated High Endurance card.

Does Garmin dash cam disconnect in hot weather?

Yes, it has a “thermal cutoff.” If the internal temperature gets too high, it shuts off to prevent the hardware from melting.

Why does Garmin Drive app keep disconnecting?

Usually, it’s because your phone is trying to save battery or switching back to cellular data because the dash cam Wi-Fi has no internet.

Should I hardwire my Garmin dash cam?

Yes. Hardwiring provides a cleaner, more stable power connection than the cigarette lighter socket and enables Parking Guard features.

Conclusion

Fixing a Garmin dash cam that keeps disconnecting is usually a 10-minute job. Start by checking your USB cable and ensuring it’s the original one. Then, format your SD card or swap it for a high-endurance version. These two steps fix almost every issue I’ve encountered in my years of testing.

Your dash cam is your most important witness. Don’t let a $20 memory card or a loose wire stand in the way of your safety.