Chris, diagnosed 1978

Contact Us

We offer a variety of ways to get the help you need, on your schedule, including 24/7 technical support.


Support Center

Did you know that Tandem has an extensive library of educational and self-help materials to help you get the most out of your Tandem pump?



Get in Touch

Technical Support

(877) 801-6901
24 hours/day
7 days a week

Pump Renewals

(858) 935-8951
Email Renewals Team
6:00 AM to 5:00 PM  (Pacific)
Monday - Friday

Order Support

(877) 801-6901
6:00 AM to 5:00 PM (Pacific)
Monday - Friday

Corporate Offices


11075 Roselle Street
San Diego, California 92121
(858) 366-6900
8:00 AM to 4:00 PM (Pacific)
Monday - Friday


1500 West Shoreline Drive
Boise, Idaho 83702
(858) 366-6900
8:00 AM to 4:00 PM (Mountain)
Monday - Friday



Send a Message

Are you already using Tandem products? If so, please call our 24-hour Technical Support Team at (877) 801-6901. For other inquiries, please complete our form below.

By submitting this form, you grant Tandem Diabetes Care, Inc. permission to add your contact information to our database to send you information and communications related to our products. We respect and uphold the confidentiality of your personal information, and will not share your information with any third-parties, except as noted in our privacy policy. A link to our privacy policy is available at the bottom of this page.


Need help with your Dexcom CGM?

For Dexcom CGM specific issues, please contact Dexcom using one of the options at For a full list of who to contact for Dexcom CGM issues, please click here.

Tandem handles issues with the connection between your Dexcom transmitter and t:slim X2 pump, as well as the below issues which you can now report online using our quick reference resources:



Dexcom CGM Applicator

Common issues include:

  • Physical Damage (e.g., Broken Needle, Cannula or Needle Retraction Issues, etc.)
  • Deployment Issue
  • Painful Insertion

Dexcom CGM Transmitter

Common issues include:

  • Physical Damage
  • Transmitter Latch Issues
  • Difficulty Inserting or Removing Transmitter
  • Low Transmitter Battery Alert
  • Transmitter Failed Error
  • Overheating or Shocking

Dexcom CGM Sensor

Common issues include:

  • Physical Damage (e.g., Broken, Detached, Missing Sensor Wire, etc.)
  • No Initial Calibration
  • Sensor Failure During 2hr Warmup
  • New Sensor Inserted, but Displays “No Restarts” (Alert 25)

Tandem t:slim X2 Pump & Dexcom CGM

Common issues include:

  • Inaccurate CGM Values
  • Pump Will Not Accept Calibration Values 
  • Early Sensor Expiration
  • Sensor Failure After 2hr Warmup
  • Pump Displays "---"
  • Pump Displays “No Readings”
  • Pump Displays “Sensor Error”
  • Pump Displays “Wait up to 3hrs”
  • Pump Displays Hourglass for Over 1hr
  • Pairing Failure (Alert 29)
  • Signal Loss (Between Transmitter and Pump)

Other Calibration Errors

Who to Contact