You should first ensure that your Dexcom G6 sensor was correctly inserted:
Watch this video on how to attach the transmitter:
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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