Tandem Mobi software recall: why a pump update matters
US regulators flagged a Class I recall of Tandem Mobi pumps over a software fault that can interrupt insulin delivery. The fix is an update, not a return.
US regulators have issued their most serious level of recall for the Tandem Mobi insulin pump, because a software fault could cause it to stop delivering insulin. The important, reassuring part: the fix is a software update, not sending the pump back. If insulin quietly stops, glucose climbs, and left unnoticed that can head toward a dangerous state called DKA, which is why a fault like this is taken so seriously. The Mobi is only in limited use in the UK, so most UK readers are not affected, but the lesson applies to any pump: keep your software current, follow the maker’s safety notices, and always carry backup insulin pens.
- A Class I recall is the most serious kind, used when a fault could cause serious harm if it is not put right.
- The fault is in the pump’s software, and the fix is a software update, so this is not a case of returning the device.
- If a pump stops giving insulin, glucose can rise, and unnoticed highs can lead to DKA (diabetic ketoacidosis, a dangerous build-up of acids called ketones when the body has too little insulin).
- The Tandem Mobi is only in limited use in the UK, so most UK readers are not affected, though the principle is universal.
- Every pump user needs a backup plan: insulin pens and a sick-day plan agreed with your team, in case a pump stops for any reason.
What the recall is about
Tandem issued a correction for the Mobi pump after finding a software fault that, in some circumstances, could make insulin delivery stop. US regulators classified it as a Class I recall, their highest severity. That label sounds frightening, but it reflects how serious any interruption in insulin could be, not that pumps are failing everywhere. The fix is a software update sent to the pump, so affected users are asked to update rather than return the device, and Tandem contacts those affected directly with what to do.
The habit this is a reminder to keep
Because the Mobi has only had a limited UK rollout, most people reading this will not be directly affected. The useful part is the reminder underneath the headline. Pumps are software now, and software gets updates that sometimes fix safety problems, not just add features. So it is worth knowing your pump’s software version, keeping it current when your manufacturer tells you to, and actually reading the safety notices they send rather than swiping them away.
The deeper point is one every pump user learns eventually: a pump can stop for many reasons, a software fault, a failed site, a kinked cannula, an empty reservoir, so a backup plan is not optional. That means having insulin pens you can fall back on, and knowing from your team how you would cover insulin if the pump were out of action. None of this is about panic. It is the ordinary safety net that makes pump life workable, and this recall is a good prompt to check yours is in place.
Worth knowing
Questions that make an appointment useful
When it's urgent
If a pump stops delivering insulin, glucose can climb and ketones can build up. If your glucose is high and you feel unwell, check for ketones (a blood or urine test) if you can, use your backup pens and your sick-day plan, and contact your diabetes team or NHS 111. A high ketone reading is itself a reason to seek urgent help. Call 999 or go to A and E straight away if you are being sick, drowsy, breathing heavily or fast, have stomach pain, or your breath smells fruity alongside a high glucose, because these can be signs of DKA, and testing must never delay the call.