Contact & Support Information

Technical Support

If an application or other resource is not performing as expected, please contact the DTNA Software Support Center.

Phone: 855-639-8680


Regular coverage hours:

5:00 AM - 5:00 PM (Pacific time), Monday - Friday

(Coverage hours may vary due to holidays, etc.)

Note: If you have questions on changing your level of access or need assistance with your login credentials, most DTNA customers will need to work directly with their organization’s Security Administrators.

Product Concerns

These online forms are for customers only. If you are a dealer or distributor, please go to the Case Management application on Salesforce via the ‘Daimler Trucks Technical Support’ icon on DTNA Portal.

  • Submit your Chassis or Detroit Powertrain Related product concern here
  • Submit your Freightliner Custom Chassis concern here 
  • Submit your Thomas Built Bus product concern here

Freightliner/WesternStar/Freightliner Custom Chassis: 800-385-4357

Thomas Built Buses: 855-253-0419 (Customer) 855-639-8686 (Dealers)