MAUDE Adverse Event Report: Tandem Diabetes Care t:slim X2 Insulin Pump with Control-IQ+ Technology; Alternate Controller Enabled Insulin Infusion Pump

Catalog Number	1014071
Medical Device Problem Code	Display or Visual Feedback Problem (1184)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	09/16/2026
Type of Reportable Event	Malfunction
Event or Problem Description
It was reported that customer saw red vertical lines or bars on cgm graph, including a red line running from top to bottom of screen.There was no reported impact to the customer¿s blood glucose level.Multiple attempts were made by tandem technical support to follow-up with the customer on the reported issue, but no response was received.
Additional Manufacturer Narrative
In use at the time of the event: cgm model: unknown.Mobile os: unknown / unknown / unknown / unknown.

• Brand Name: t:slim X2 Insulin Pump with Control-IQ+ Technology
• Common Device Name: Alternate Controller Enabled Insulin Infusion Pump
• Manufacturer (Section D): Tandem Diabetes Care; 12400 high bluff drive; san diego CA 92130
• Manufacturer Contact: john connell ; 12400 high bluff drive; san diego, CA 92130 ; +1(858)224-6281
• MDR Report Key: 50947683
• Report Number: 3013756811-2026-177737
• Device Sequence Number: 18529767
• Product Code: QFG
• UDI-Device Identifier: 00389152407111
• UDI-Public: (01)00389152407111(22)1019458(11)260519
• Combination Product (Y/N): N
• Initial Reporter Country: US
• PMA/510(K) Number: K250792
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Consumer
• Type of Report: Initial
• Report Date (Section B): 09/30/2026

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: No
• Is this a Product Problem Report?: Yes
• Operator of Device: Lay User/Patient
• Device Catalogue Number: 1014071
• Was Device Available for Evaluation?: No
• Is the Reporter a Health Professional?: No
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 09/16/2026
• Initial Report FDA Received Date: 09/30/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 05/19/2026
• Is the Device Labeled for Single Use? (Y/N): No
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Usage of Device: Reuse
• Patient Sequence Number: 1
• Patient Sex: Unknown