What should I do if a Dexcom G7 sensor fails soon after pairing?
Answer
A Dexcom G7 that fails minutes after pairing usually needs a replacement sensor session through the Dexcom app. Confirm the failure message, stop using that sensor, and start a new sensor only with official Dexcom guidance.
Before you start: stop right away if…
- Glucose monitoring decisions for medical care should follow clinician advice and the device labeling; use a backup blood glucose meter when the CGM session has failed.
Follow these steps
Read the exact app message
Open the Dexcom app and write down the full failure or replace-sensor wording, including any code if shown.
You should see: The failure is confirmed as a sensor session problem rather than a temporary Bluetooth glitch.
End the failed sensor session
Follow the app prompts to stop or replace the failed sensor. Do not keep relying on readings from a sensor the app has marked failed.
You should see: The failed session is closed in the app.
Start a new sensor with official steps
Apply and pair a new G7 only using Dexcom’s current instructions for placement, warm-up, and pairing. Keep the phone nearby during pairing.
You should see: The new sensor pairs and begins its warm-up without an immediate failure alert.
Contact Dexcom if failures repeat
If a second new sensor fails quickly, contact Dexcom support through official channels about a possible defective lot or phone compatibility issue.
You should see: Dexcom provides replacement guidance or next troubleshooting steps.
Not sure this is the right page? Check here
0 of 5 checked
Extra tips
What to look for: A sensor failure, replace sensor, or similar alert in the Dexcom app shortly after pairing, with or without a specific error code
Before you change anything: Note the exact wording in the Dexcom app. Confirm the phone’s Bluetooth is on and the official Dexcom app is up to date. Do not reuse a failed sensor. For urgent glucose decisions, use a backup meter as directed by a clinician and Dexcom labeling.