What can I do if my Dexcom G6 sensor fails during the 2-hour warmup period?

You should first ensure that your Dexcom G6 sensor was correctly inserted:
  • Was the previous sensor session ended or is the system still trying to connect with a previous sensor?
  • Is the transmitter’s serial number correctly entered into the receiver or smart device? Click here for how to pair your transmitter.
  • Did you clean your sensor site with a topical antimicrobial solution (such as isopropyl alcohol) and the transmitter with a damp cloth or alcohol wipes?
  • Did you remember to tuck the front tab on the narrow end of the transmitter into the transmitter holder before snapping in the wide end?
  • Did you hear a click when snapping your transmitter into the sensor, and is the transmitter sitting flush in the sensor pod?
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.
View our guide on troubleshooting sensor errors to help you understand common error messages and alerts you may sometimes see on your Dexcom G6 Continuous Glucose Monitoring (CGM) System app or receiver screen.
For more information on sensor failures, read the Dexcom G6 User Guide.
*For a list of compatible devices, visit www.dexcom.com/compatibility

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What do I do if I receive the Sensor Failed alert?

If you are receiving a Sensor Failed Alert on your Dexcom G6 and your inserted sensor will no longer give CGM values
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Why did my Dexcom G6 sensor fail after I started receiving readings from my current sensor session?

During a sensor session, your Dexcom G6 may detect that the sensor can no longer determine your glucose reading. At this time, the sensor session will end and your receiver or compatible smart device will display the Sensor Failed screen. You will now need to replace the sensor.
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