CGM features and fixes · Dexcom ONE+
Dexcom ONE+ sensor error
Brief Sensor Issue means the sensor cannot read glucose for now. It often happens on day 1 and usually fixes itself within 3 hours. It can lead to a Sensor Failed alert. (Dexcom user guide, p. 63)
What the maker says to do
- Do not remove the sensor.
- Use a blood glucose meter for treatment decisions.
- Contact Dexcom Technical Support if it lasts more than 3 hours.
Dexcom ONE+ is not sold in the US. All facts here come from Dexcom's UK and Ireland pages, the UK App Store listing and the outside-US English user guide (mmol/L). Dexcom says Share and Follow may not be available in all regions.
More on the Dexcom ONE+
- Follower app not updating
- Signal loss
- Warm-up
- Sensor failed early
- Compression lows
- Alarms not sounding
- Follower not getting alerts
- Compatible phones
Sensor error on other CGMs
- Dexcom G6
- Dexcom G7
- Dexcom Stelo
- FreeStyle Libre 2 and 2 Plus
- FreeStyle Libre 3 and 3 Plus
- Medtrum TouchCare Nano CGM
- Eversense 365
- Medtronic Simplera
- SIBIONICS GS1
Sources, quoted
- Dexcom user guide, p. 63: “Your sensor has a temporary issue. This issue often happens during the first day of a sensor session, but it can happen anytime. It usually fixes itself within 3 hours.”
- Dexcom user guide, p. 63: “Don't remove sensor. Use BG meter for treatment decisions.”
- Dexcom user guide, p. 63: “If Brief Sensor Issue continues for more than 3 hours, contact Dexcom Technical Support at dexcom.com or contact your local”
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.