How do I replace Dexcom sensors that failed before the 15-day wear period?
Answer
If Dexcom sensors quit early, check the app or receiver for a specific failure or “replace sensor” message, then start a new sensor only after confirming the failed session ended. For early failures within the expected wear window, contact Dexcom support through the official app or website to request a sensor replacement.
Before you start: stop right away if…
- Glucose-monitor failures can affect treatment decisions. Follow your clinician’s guidance and use a backup meter if readings are unavailable.
Follow these steps
Capture the failure details
Open the Dexcom app or receiver and write down the exact alert text, any error code, the sensor start date, and when it failed.
You should see: You have the failure message and timing for each sensor that quit early.
End the failed sensor session
Follow the on-screen prompts to stop or replace the failed sensor session so the app is ready for a new sensor.
You should see: The failed session is closed and the app or receiver is ready to start a new sensor.
Start a spare sensor if available
If you have a spare sensor, insert and start it using the official Dexcom instructions for your model, then confirm readings begin after the warm-up period.
You should see: A new sensor session starts successfully, or you see a clear new error to report.
Request a replacement for early failure
Contact Dexcom support through the official app or website and report the early failure with the sensor details and error text from the failed sessions.
You should see: You have a support case or replacement request for the sensors that failed before 15 days.
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Extra tips
What to look for: A “Replace Sensor” or similar alert in the Dexcom app or receiver, plus any error code shown when the session ended early.
Before you change anything: Note the exact error text or code and when each sensor failed. Confirm you are using the official Dexcom app or receiver menus, not a third-party link. Do not reuse a sensor that already reported a hard failure. Never share account passwords or one-time codes with unexpected callers.