Requesting GM Upfitter Technical Assistance

The GM Upfitter Integration website — — offers a variety of valuable information and assistance for technicians and other personnel, including the latest bulletins involving upfitter equipment and technical assistance on upfitter repairs. (Fig. 11)

Fig. 11


The website offers light- and medium-duty Body Builder Manuals, Technical Bulletins on issues that have come up during the model year, Best Practice Manuals with engineering recommendations and guidelines for special vehicle manufacturers; links to other fleet or commercial vehicle-related GM and non-GM websites, a variety of FAQs covering common upfitter questions, and a generic (non-VIN specific) Incomplete Vehicle Documents database that is searchable by model year.


Technical Assistance

If assistance is needed when adding non Original Equipment (OE) content to a vehicle, contact the GM Upfitter Integration Group by selecting “Contact Us/Request Data” at the top of the home page. A request form will appear. (Fig. 12)

To request technical assistance from the GM Upfitter Integration Group, complete and submit the form, including contact information and vehicle information.

Fig. 12


Once a case is received, it will be reviewed and additional information about the vehicle and the scope of the upfit may be requested. You will receive a telephone call and/or e-mail from a technical liaison engineers within 48 business hours of receipt of the request. The technical assistance is intended to be an advisory service for commercial vehicles only.


Upfitter Bulletins

Under the Technical Bulletin tab, bulletins covering light-duty, medium-duty, and passenger vehicles are provided in a PDF format. Topics cover mid-year vehicle design changes, GM information that affects upfitter modifications, and frequent issues that upfitters encounter.

The bulletins can be searched by model year, vehicle and vehicle type, or select “Show all bulletins” to view all bulletins currently available. (Fig. 13)

Fig. 13


– Thanks to Bob Briedis

Silverado 4500HD, 5500HD, 6500HD Powertrain Operation
Shipping Hazardous Materials to the Warranty Parts Center


  1. Anthony Valdez says:

    What color wire is the outside sound deadening wire on the bose system connectors?
    2017 Sierra Denalu

  2. Nick Bourdeau says:

    When will the site be back up and operational?

  3. Charles Debrie says: website has not been available for a week. Keep getting a ” This website can’t be securely connected ” message. I need bulletin 124x

  4. The website is undergoing maintenance. It should be available shortly.

  5. Kevin Penrod says:

    I am unable to access the website. It will not load. Is there a specific way to access the website?

  6. The website is currently undergoing maintenance.

  7. MIKE CORDELL says: website has not been available for a week. Keep getting a ” This website can’t be securely connected ” message. I need bulletin 124x

  8. Eric Wilkinson says:

    No steering wheel control backlight. Controls work perfectly just will not illuminate. 2015 Silverado