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The Daily Insight

Why do my dexcom sensors keep failing?

Author

John Thompson

Published Mar 07, 2026

Why do my dexcom sensors keep failing?

During the warmup period, the Dexcom G6 CGM System may detect that your sensor is unable to retrieve glucose information once the session starts. At this time, the warmup period will end and your receiver or compatible smart device* will display the “Sensor Failed” screen. You will now need to replace the sensor.

Can you change your dexcom G6 sensor early?

You can change a Dexcom G6 sensor earlier than 10 days. Just make sure to select “Stop Sensor” in your compatible smart device* or receiver before removing the old sensor; this will help you avoid any unnecessary issues with your new sensor.

Can you reuse a Dexcom sensor?

The G6 is FDA approved for 10 day wear only and it is possible that the sensor isn’t as accurate the longer you wear it. I extend my sensors at my own risk, and so should you. Additionally, I’ve extended mine successfully, but of course cannot guarantee that yours will.

Why does my dexcom G6 keep asking me to calibrate?

If you don’t enter a sensor code, you will be prompted to manually calibrate your system using values obtained from a blood glucose meter and fingersticks. You will also be prompted to calibrate twice after sensor warmup before you will begin receiving Dexcom G6 readings.

Why do I keep losing signal on my dexcom G6?

If you are experiencing signal loss you will see the “signal loss” error message on your display device. This error can be caused by the transmitter being over 20 feet away from your display device, a bug in your phone operating system, your transmitter not snapped in, or an issue with the transmitter.

Can you stop and restart a dexcom G6 sensor?

Reset = resetting the clock on the transmitters so that you can use them beyond 110 days that Dexcom officially ends them at. If you reset a transmitter, you get another 110 days to run that battery down to nothing. When the battery dies, no amount of resetting will help.

When should I replace my Dexcom sensor?

A single Dexcom G6 sensor can be worn up to 10 days. For tips on keeping your sensor on for the full 10-day wear, please reference our sensor adhesive tips.

How often should I calibrate my dexcom G6?

If the sensor code is lost, a user must calibrate with fingersticks quite a bit: twice after the two-hour sensor warmup is complete, a third time 12 hours later, a fourth time 12 hours after that, and then once every 24 hours.

Why is my dexcom G6 not accurate?

If your Dexcom G6 readings are always higher (or always lower) than your meter values and always outside the 20 rule, consider calibrating. Also consider calibrating if your Dexcom G6 and meter numbers don’t match and your expectations or symptoms fit the meter value, but not the Dexcom G6 reading.

When should I calibrate my dexcom G6?

You will also be prompted to calibrate twice after sensor warmup before you will begin receiving Dexcom G6 readings. Then, you will be prompted to calibrate 12 hours later and once more at the 24-hour mark (another 12 hours later).

Why is my Dexcom G6 CGM sensor not working?

How to keep my Dexcom sensor adhered for the full 10 days?

How can I keep my Dexcom sensor adhered for the full 10 days? What happens if my Dexcom G6 sensor deploys early? What do I do if my Dexcom G6 applicator won’t come off? Where can I order sensor overpatches? Does the Dexcom G6 Continuous Glucose Monitoring (CGM) System require calibrations? Can I restart the Dexcom G6 sensor after 10 days?

Is there a Dexcom G6 + transmitter in South Africa?

In South Africa, Dexcom is rolling out a new G6+ system…as part of that system, there’s the G6+ transmitter. It has all the same features of the G6 firefly transmitter described above but says “DexcomG6+” on the top. The transmitter IDs for the G6+ start with 22xxxx.

Do you need a Dexcom receiver for your CGM system?

Do I need to use my Dexcom receiver for my Dexcom Continuous Glucose Monitoring (CGM) System to work? What is a sensor code and why do I need one?

Does Dexcom G6 require calibration?

With the factory-calibrated Dexcom G6, users do not need to calibrate the CGM. By entering the sensor code labeled on each sensor into the user’s display device, the Dexcom G6 provides accurate sensor glucose readings.

How much does a Dexcom CGM cost?

At the time of this writing, Dexcom offered three CGM systems: the Dexcom G5 Mobile CGM system, the most popular option at this time, which retails for about $500 to $800 per transmitter without insurance, and the Dexcom G6 GCM, which is expected to retail for more than the G5, but at this time,…

Where to place Dexcom G6?

Dexcom G6 sensors are recommended for use on the abdomen for those between ages 2 and up and on the back (upper buttocks) between ages 2 and 17.

What does Dexcom transmitter do?

The Dexcom CGM system offers dynamic glucose information in real-time, eliminating the need for fingersticks for daily glucose management solutions. With a small sensor injected beneath the skin, the transmitter, which fastens atop the sensor, is able to send data wirelessly to either your smart device or a Dexcom receiver.