CGM features and fixes · Dexcom G7

Dexcom G7 sensor failed early: getting a replacement

When G7 shows Sensor Failed, remove the sensor and start a new one. Dexcom replaces failed G6 and G7 sensors under its Sensor Replacement Policy; you need the sensor serial number (SN). (Dexcom)

What the maker says to do

1. Remove the failed sensor and insert a new one.
2. Submit a Product Support Request on dexcom.com, or call Dexcom Technical Support at 1-844-607-8398 (24 hours a day, 7 days a week).
3. Have the serial number (SN) of the failed sensor and your contact information ready.

More on the Dexcom G7

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

Sensor failed early 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: “If you receive this alert, you must remove your sensor and begin a new session.”
• Dexcom: “If you are experiencing product issues with your Dexcom G6 or G7 CGM sensors follow the steps below: 1. Submit a Product Support Request or contact our product technical support team.”
• Dexcom: “to report a sensor issue, you will be asked to provide the unique identifying number of your product, otherwise known as the Serial Number (or "SN").”
• Dexcom: “3. Have your contact information ready.”
• Dexcom: “Global Technical Support - Product troubleshooting or replacement inquiries 1-844-607-8398 Available 24 hours a day; 7 days a week”

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.