Stop using now Medical device recall · FDA · Published April 23, 2018

Tandem t:slim G4 Insulin Pump Recall: Inaccurate Battery Readings

Tandem recalls 55 t:slim G4 insulin pumps due to faulty fuel gauges that may cause inaccurate battery readings and stop insulin delivery.

Plain-English summary generated from official FDA data by GovInfoNow · Published by Carlos Caban · How we make summaries

🇺🇸 FDA recall #Z-2471-2018Medical device Tandem Diabetes Care ›

Stop using this now

The fuel gauge, the component that reads and reports the battery parameters to the pump, could provide inaccurate readings, which present to the user in one of two ways: A) by triggering a Malfunction 4 Alarm, or B) by triggering a succession of notifications prior to the pump shutting off, including Alert 2 (Battery Low), Alert 3 (Battery Very Low) and Alarm 12 (Battery Very Low). The alarms in both scenarios notify the user that the pump has stopped delivering insulin.

Take action

Contact the company

Recalling firmTandem Diabetes Care Inc11075 Roselle St Ste 200 · San Diego, CA 92121-1231

✎ GovInfoNow plain-language explainer

Tandem Diabetes Care is recalling 55 t:slim G4 Insulin Pumps equipped with Dexcom G4 Platinum CGM Software version 4.3.4.3. The issue involves a fuel gauge component that can provide inaccurate battery readings, potentially triggering alarms or causing the pump to shut off unexpectedly. This malfunction presents a risk because it notifies the user that the pump has stopped delivering insulin. Read more at govinfonow.com/recall/71350-tandem-diabetes-care-t-slim-g4-pump-software-version-4.

Source Summary by GovInfoNow · govinfonow.com/recall/71350-tandem-diabetes-care-t-slim-g4-pump-software-version-4 · Updated October 13, 2026 · FDA enforcement record: FDA #Z-2471-2018

Cite this page

“Tandem t:slim G4 Insulin Pump Recall: Inaccurate Battery Readings.” GovInfoNow, updated October 13, 2026. https://govinfonow.com/recall/71350-tandem-diabetes-care-t-slim-g4-pump-software-version-4. Based on FDA recall #Z-2471-2018 (https://api.fda.gov/device/enforcement.json?search=recall_number:%22Z-2471-2018%22&limit=1).

The FDA announced on April 23, 2018, that Tandem Diabetes Care Inc. is recalling the t:slim G4 Insulin Pump with specific Dexcom G4 Platinum CGM software and firmware versions due to a faulty fuel gauge. The defect can cause inaccurate battery readings, triggering alarms that notify users the pump has stopped delivering insulin.

How to tell if you have it

Brand: Tandem Diabetes Care
Product: t:slim G4 Insulin Pump with Dexcom G4 Platinum CGM Software version: 4.3.4.3, Firmware version: 004722, Firmware, Fuel Gauge, Binary Rev B.
Serial Numbers: 483731, 483930, 483992, 484013, 492055, 492368, 501157, 501177, 501178, 501187, 501191, 501200, 501202, 501205, 501207, 501268, 501285, 501364, 501368, 501370, 501376, 501385, 501386, 501387, 501432, 501435, 501440, 501443, 501444, 501445, 501466, 501479, 501488, 501490, 501491, 501495, 501503, 501508, 501509, 501519, 501522, 501523, 501526, 501535, 501560, 504522, 504531, 504535, 504540, 504753, 504972, 504990, 505025, 90472671, 90488584
Quantity: 55 units

The hazard

The fuel gauge component could provide inaccurate readings, presenting as either a Malfunction 4 Alarm or a succession of notifications including Alert 2 (Battery Low), Alert 3 (Battery Very Low) and Alarm 12 (Battery Very Low) before the pump shuts off. In both scenarios, these alarms notify the user that the pump has stopped delivering insulin.

Context

GovInfoNow's records show Tandem Diabetes Care, Inc. has had 10 other recalls on record since September 10, 2020. Other recent recalls of similar products include Medtronic MiniMed 780G Insulin Pump Recall (May 27, 2026), MiniMed Flex Insulin Pump Recall (August 20, 2026) and Medtronic MiniMed 630G Insulin Pump Recall (February 13, 2026).

How to tell if you have this one

Check if you have a t:slim G4 Insulin Pump with Dexcom G4 Platinum CGM Software version 4.3.4.3 and Firmware version 004722. Verify the serial number against this list: 483731, 483930, 483992, 484013, 492055, 492368, 501157, 501177, 501178, 501187, 501191, 501200, 501202, 501205, 501207, 501268, 501285, 501364, 501368, 501370, 501376, 501385, 501386, 501387, 501432, 501435, 501440, 501443, 501444, 501445, 501466, 501479, 501488, 501490, 501491, 501495, 501503, 501508, 501509, 501519, 501522, 501523, 501526, 501535, 501560, 504522, 504531, 504535, 504540, 504753, 504972, 504990, 505025, 90472671, 90488584.

Brand
Tandem Diabetes Care
Category
Medical device

Based on the official FDA remedy

What to do — step by step

Check Your Device Details
Verify your pump's software version (4.3.4.3), firmware version (004722), and serial number against the recall list.
Contact Tandem Diabetes Care
Reach out to the manufacturer for instructions on how to proceed with the recall remedy, as specific steps are not detailed in this record.

Where it went and when

Where it was distributed

Distributed in 23 states.

FDA distribution: “U.S. Consignees: IN, AZ, UT, TX, NY, NJ, MD, MN, IL, CO, AL, WI, CA, PA, OH, OR, MS, FL, NM, ID, NV, KY, VA,” States read from FDA’s own wording; “not listed” means the notice does not name it.

States: Alabama, Arizona, California, Colorado, Florida, Idaho, Illinois, Indiana, Kentucky, Maryland, Minnesota, Mississippi, Nevada, New Jersey, New Mexico, New York, Ohio, Oregon, Pennsylvania, Texas, Utah, Virginia, Wisconsin.

Recall timeline

FDA published this recall 3 months after the firm started it.

Apr 23, 2018Firm started the recall
Jul 18, 2018FDA classified it Class II
Jul 25, 2018Published in FDA’s Enforcement Report

Dates from the agency record only; steps without a date are left out.

✎ GovInfoNow

Questions people ask

From the GovInfoNow team · based on the FDA notice · How we make summaries

How many units are being recalled?

A total of 55 units are included in this recall.

Similar recalls

Other Tandem Diabetes Care recalls

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Keep exploring

More Tandem Diabetes Care recalls

Link to this recall

<a href="https://govinfonow.com/recall/71350-tandem-diabetes-care-t-slim-g4-pump-software-version-4">Tandem t:slim G4 Insulin Pump Recall: Inaccurate Battery Readings (GovInfoNow)</a>

Where this comes from

The facts (hazard, remedy, dates, manufacturer) are pulled from the official FDA recall record. The plain-language summary and step-by-step checklist are written by GovInfoNow to make the official notice easier to act on — they don’t replace it.

Official source: FDA Recall #Z-2471-2018 (April 23, 2018) — FDA publishes no per-recall page; this is the official machine-readable enforcement record. Search FDA recalls for Z-2471-2018 to see it in context.
Plain-language summary written by qwen3.6:35b-a3b on October 13, 2026, from the official record above. Not reviewed by a person — if it conflicts with the FDA notice, the notice is correct. Report an error on this page.
GovInfoNow is an independent service and is not a government agency. We republish official FDA recall data; we don’t issue, amend or administer recalls.