CGM features and fixes · Dexcom G7

Dexcom G7 signal loss: what the maker says to do

Signal Loss means the phone has stopped getting readings from the G7 sensor. The last reading stays for 10.5 minutes, then shows '---' and then Signal Loss. The sensor sends only once every 5 minutes, so a fix can take a while to show. (Dexcom)

What the maker says to do

1. Bring the G7 app to the foreground and do not swipe it closed.
2. Turn Bluetooth off, then on again, and leave it on.
3. Keep the phone within 6 meters (20 feet) of the sensor, on the same side of your body.
4. Restart the phone and the app.
5. Use the phone settings in the app at Profile > Phone Settings and keep the battery above 20%.
6. If Signal Loss lasts more than 30 minutes, call Dexcom Technical Support at 1-844-607-8398.

A call when readings stop

Glide sends every phone on the profile a lost signal banner after 30 minutes without a reading, and overnight it can call a phone number you verify (Premium). How the lost-signal call works.

More on the Dexcom G7

• Follower app not updating
• Sensor error
• Warm-up
• Sensor failed early
• Compression lows
• Alarms not sounding
• Follower not getting alerts
• Compatible phones

Signal loss on other CGMs

• Dexcom G6
• Dexcom ONE+
• Dexcom Stelo
• FreeStyle Libre 2 and 2 Plus
• FreeStyle Libre 3 and 3 Plus
• Medtrum TouchCare Nano CGM
• Eversense 365
• Medtronic Simplera
• SIBIONICS GS1

Sources, quoted

• Dexcom: “Your last sensor reading will show on your display device for 10.5 minutes, if a new reading does not come in after that time, your display goes to”
• Dexcom: “The Dexcom G7 sensor only sends glucose readings by Bluetooth for a short period of time once every 5 minutes, so once you correct the issue, it can still take a while to see a new glucose value.”
• Dexcom: “Bring the running Dexcom G7 app to the foreground of your smart device. Do not swipe kill your app; it is intended to run at all times”
• Dexcom: “Turn Bluetooth off. Then turn it back on and leave it on.”
• Dexcom: “Keep your display device within 6 meters of the sensor with nothing between them, including your body, walls, and water. Keep your display device on the same side of your body as your sensor.”
• Dexcom: “Restart your phone and the app.”
• Dexcom: “Use recommended phone settings listed in the app at Profile > Phone Settings Keep your phone battery charged to at least 20%”
• Dexcom: “If Signal Loss continues for more than 30 minutes, contact technical support (in the app, go to Profile > Contact)”
• Dexcom: “Global Technical Support - Product troubleshooting or replacement inquiries 1-844-607-8398”

Every quote is checked against its source page before each update of this site; last checked 2026-10-06. Makers change their apps; the source page is the authority when it differs.