How do I fix a Dexcom G7 pairing failure that says Connection unsuccessful?
Answer
A Dexcom G7 Connection unsuccessful message usually means the 4-digit pairing code was entered wrong, another phone is still paired, or the sensor is too far away. Enter the code from that sensor’s applicator exactly, keep the phone close, and remove old Dexcom Bluetooth pairings before trying again.
Before you start: stop right away if…
- Entering the wrong sensor code or starting the wrong sensor can interrupt an active glucose monitoring session.
Follow these steps
Bring the phone next to the sensor
Hold the phone within a few feet of the worn G7 sensor, turn Bluetooth on, and leave the Dexcom app open on the pairing screen.
You should see: The phone stays close enough for pairing and Bluetooth remains enabled.
Enter the exact 4-digit pairing code
Enter the 4-digit pairing code from that sensor’s applicator exactly as printed. Do not reuse a code from a previous sensor.
You should see: The app accepts the code and continues pairing, or it shows a clearer error if the code is wrong.
Remove old Dexcom Bluetooth pairings
If pairing still fails, open the phone Bluetooth settings and forget any old Dexcom or G7 device entries, then return to the Dexcom app and try pairing again with the same sensor code.
You should see: Old Dexcom Bluetooth entries are removed and the app can attempt a fresh pairing.
Restart the phone and retry once
Restart the phone, open the Dexcom app, keep the phone close to the sensor, and attempt pairing one more time with the correct applicator code.
You should see: The sensor pairs successfully, or Connection unsuccessful persists and points to sensor replacement or Dexcom support.
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Extra tips
What to look for: The exact Connection unsuccessful message, any sensor ID such as a code shown in the alert, and the 4-digit pairing code printed on that sensor’s applicator.
Before you change anything: Use only the pairing code from the sensor you just started, not an old applicator. Keep the phone a few feet from the sensor during pairing. Do not start a new sensor session unless you intend to replace the current one. Never share account passwords or app codes with unexpected callers.