A sensor peels off on day three. A pod screams an occlusion alarm an hour after you put it on. A CGM reads wildly wrong and shuts down early. It's expensive, it's stressful, and when you've already burned through your stock it can feel like an emergency. The good news: an early device failure is a warranty replacement, the maker replaces it free, and it doesn't touch your insurance supply. You just have to know exactly who to call and what to have in hand.
Dexcom (G6 and G7): failed sensor or transmitter
Report it to Dexcom Tech Support as soon as you notice the failure. You can submit online through your account or as a guest, or call 1-844-607-8398 (24/7). Dexcom replaces confirmed product failures for free, and its replacement policy says it does so without a set limit.
The main thing they need is the serial number: Dexcom defines it as the 12 digits that begin right after the number 21 on the sensor box, applicator, or in the app. Have the error message and the dates ready too. There's no published deadline to report, but "as soon as possible" matters, because a fresh, specific report is easier to confirm as a defect.
FreeStyle Libre (2 and 3): failed sensor
Request a replacement from Abbott if a sensor falls off, throws an error, or reads differently than expected. Use the sensor support request form or call 1-855-632-8658 (7 days a week, 8am to 8pm ET, with 24/7 chat). Abbott says over 95% of private plans cover Libre, and a failed-sensor replacement is handled through support, not a new insurance claim. Having the sensor's serial number ready speeds it up.
Omnipod (5 and DASH): failed pod
Report a pod failure through the form or chat in PodderCentral, or call Insulet at 1-800-591-3455. Omnipod asks for more detail than the CGMs, so have it in front of you before you start: the replacement request needs your controller or PDM serial number, the pod LOT and sequence (both printed on the pod itself), and the alarm code if it alarmed (hazard, occlusion, or blockage). Dates and what happened leading up to it help.
The catch: replacements ship, they don't teleport
The manufacturer mails the replacement. That's fine if you have a spare, and a real problem if the failure just used your last one. There is no official same-day pharmacy voucher from any of these makers, so don't count on one. What you can do the moment a failure leaves you short:
- Report the failure immediately so the replacement ships as fast as possible, and ask the rep about expedited shipping.
- If you have pharmacy coverage for your CGM, a new sensor may be available at your retail pharmacy as a normal refill; ask the pharmacist whether your prescription allows an early pickup.
- For a pump user with no working pod, call your prescriber about a backup plan (injections with a bridging insulin script) until the replacement lands. Never skip insulin waiting on a shipment.
- Keep at least one spare sensor or pod in reserve at all times, and rotate it before it expires. It converts every future failure from a crisis into a phone call.
When they blame "user error"
This is the fight the patient communities know well: you report a failure and the rep decides it was application or removal, not a defect. That matters because a confirmed product failure is replaced free without limit, while a sensor judged non-defective only "may be eligible" for a discretionary courtesy replacement. Getting it classified correctly is the whole game.
- Before you call, write down the serial and lot numbers, the exact error or alarm code, and the dates it was applied and failed.
- Describe the failure in device terms ("sensor error code, day 4 of 10, no impact or pull"), not "it fell off," which invites the user-error label.
- If a rep denies a defect replacement and you believe it was one, ask for a supervisor.
- Note a pattern: multiple failures from the same lot number is evidence of a manufacturing defect, not your technique. Keep a running log of case and reference numbers.
How Kite handles this
This is a job Kite makes painless. Text it "my Dexcom failed" (or Libre, or Omnipod) and it walks you through capturing the exact serial or lot number, error code, and dates the maker will ask for, hands you the right phone number and online form for your device, and checks your Omnipod lot against the current recall. Then it sets a reminder to follow up if the replacement hasn't shipped, and keeps every case number saved in your thread so a "user error" runaround has a paper trail. Text Kite to start.