What should I do if a Dexcom G7 sensor fails after a few days?
Answer
If a G7 sensor fails early with Sensor Failed or similar, stop using that sensor, note the failure day in the Dexcom app, and contact Dexcom support about a possible warranty replacement. Insurance often will not refill early, so a manufacturer replacement is usually the path when a sensor dies mid-wear.
Before you start: stop right away if…
- Glucose sensor failures can affect diabetes management decisions. Follow your clinician’s guidance for backup testing if readings are unavailable.
Follow these steps
Capture the failure details
In the Dexcom G7 app, note the exact alert text (such as Sensor Failed), the sensor start date, and the day it failed. Take a screenshot if the app allows it.
You should see: You have a clear record of when and how the sensor failed.
Stop that sensor session
End or remove the failed sensor session in the app, then carefully remove the failed sensor from your skin. Do not try to restart the same failed sensor.
You should see: The failed session is closed and the old sensor is removed.
Check whether you can start a spare
If you already have an unused G7 sensor available, start a new one using the official Dexcom setup steps. If you do not have a spare, skip to contacting Dexcom about replacement.
You should see: A new sensor session starts, or you confirm you need a replacement sensor.
Contact Dexcom about an early failure
Use the official Dexcom support or product support path and report an early sensor failure with your start and fail dates. Ask whether a warranty replacement is available when insurance will not refill early.
You should see: You get guidance on a replacement sensor or next steps for your account.
Ask your pharmacy or insurer only about refill rules
If you need a filled prescription sooner, contact your pharmacy or insurer about early refill rules. Treat that as separate from Dexcom’s possible sensor replacement process.
You should see: You know whether an early refill is possible, or that you must wait on insurance timing.
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Extra tips
What to look for: A Sensor Failed or sensor session ended message in the Dexcom G7 app, how many days the sensor had been worn, and whether a new sensor can be started.
Before you change anything: Confirm you are using the official Dexcom G7 app or receiver. Write down the date the sensor started and when it failed. Do not reuse a failed sensor. Have your Dexcom account or order details ready before contacting support. Never share account passwords or one-time codes with unexpected callers.