Dexcom is facing a proposed class action lawsuit over its G7 continuous glucose monitor (CGM), following claims that the device failed to alert users to dangerous blood sugar levels and suffered from repeated technical issues. The case, filed in the U.S. District Court for the Central District of California, was brought by Kelly Grisoli, a parent of a child with type 1 diabetes. Grisoli says the G7 gave inaccurate glucose readings and failed to deliver crucial alerts when her child’s blood sugar went too high or too low.

We’ve previously spoken with Dexcom about accuracy and sensor failures and have reported on our own experience with G7 sensor failures, offering guidance on what users should know and how to troubleshoot common problems. This new lawsuit now puts those same reliability concerns in a legal spotlight, suggesting the problems may run deeper than individual device glitches.

According to the complaint, Grisoli experienced repeated sensor malfunctions, many failing after only a few days of use. When she contacted Dexcom for replacements, she says the company refused, citing too many requests in a short period. The lawsuit argues that these failures put users at risk of severe health consequences, including seizures, coma, or death.

The legal action also points to two FDA Class I recalls involving the G7, which represent the agency’s most serious type of alert. The first recall, in June 2025, involved a hardware defect that could silence the receiver’s speaker, preventing audible alerts. The second, in September 2025, targeted a software issue in Dexcom’s mobile apps that failed to display “Sensor Failed” warnings when the transmitter stopped working. Earlier this year, the FDA also issued a warning letter to Dexcom citing ongoing reliability concerns.

For people living with diabetes, missed alerts are not just technical glitches. These warnings can be the first line of defense against serious lows or highs that can lead to emergencies. The lawsuit claims users paid for a device that did not perform as promised and that the safety risks were not properly disclosed.

Dexcom has not yet commented on the case. Have you experienced failures or alert issues with your CGM? What are your thoughts on this lawsuit and what it could mean for the future of diabetes tech? Share your experience and perspective in the comments below.

Disclaimer: Diabetech content is not medical advice—it’s for educational purposes only. Always consult with a physician before making changes to your healthcare.