Dexcom G6 Failed Sensor Service Request

Please read carefully before proceeding to the form

Only use this form if you are a Tandem pump user who has experienced a failed Dexcom G6 sensor AFTER the 2-hour warmup period has completed. If your pump did not display the words “Sensor failed” please see below for help with other CGM issues.

For G6 sensor failures DURING the 2-hour warmup period, please use the Dexcom Product Support Request Form instead.

For all other CGM issues

Tandem handles issues with the connection between your Dexcom transmitter and t:slim X2 pump, questions about calibration, the “???” display, and sensor failures after the 2-hour warmup period.

For all other CGM issues, including the sensor failure during the 2-hour warmup, “no restarts” alert or physical problems with your sensor or transmitter, such as bleeding, bruising, skin reaction, adhesive issues, applicator issues, or broken wires, you should contact Dexcom using one of the options at

For more information about who to contact regarding CGM concerns, please refer to this article in our online Support section, which contains a variety of resources for help using our products.

Did you know that Dexcom offers free overpatches to provide extra protection and durability for their CGM sensors? You can order these overpatches here: Overlay Patch Form.

How to use this form

All required fields are marked with a *.

Once you submit the form, your request will be processed within 24 hours.  Our technical support team will contact you if we require additional information to process your request.

If applicable, your replacement will be shipped via standard ground shipping.