CGM features and fixes · Medtronic Simplera

Medtronic Simplera sensor error

Change sensor means the sensor is not working and must be replaced. Sensor updating can last up to 2 hours with no readings; Connection error means the sensor is trying to reconnect. Use a meter during these times. (Medtronic user guide, p. 32; Medtronic)

What the maker says to do

1. On Change sensor, insert a new sensor.
2. On Sensor updating or Connection error, wait and check glucose with a meter.
3. If Sensor updating lasts more than 3 hours, replace the sensor and contact Medtronic.

Simplera (standalone) sends readings to the Simplera app on a phone; Simplera Sync pairs with the MiniMed 780G pump, and the MiniMed Mobile app is a secondary display for the pump.

More on the Medtronic Simplera

• Follower app not updating
• Signal loss
• Warm-up
• Sensor failed early
• Alarms not sounding
• Follower not getting alerts
• Compatible phones

Sensor error on other CGMs

• Dexcom G6
• Dexcom G7
• Dexcom ONE+
• Dexcom Stelo
• FreeStyle Libre 2 and 2 Plus
• FreeStyle Libre 3 and 3 Plus
• Medtrum TouchCare Nano CGM
• Eversense 365
• SIBIONICS GS1

Sources, quoted

• Medtronic user guide, p. 32: “The sensor is not working properly and needs to be replaced.”
• Medtronic user guide, p. 32: “The sensor is updating. Updating can take up to 2 hours. SG readings will not be available during this time. Measure the BG value with the meter.”
• Medtronic user guide, p. 32: “The sensor is trying to reconnect. Wait at least 30 minutes.”
• Medtronic: “But if it lasts for more than three hours,† replace the sensor, and get in touch with Medtronic for help.”

Every quote is checked against its source page before each update of this site; last checked 2026-10-06. Makers change their apps; the source page is the authority when it differs.