Diesel fleet self-certification

The Heavy-Duty Diesel Emissions Testing Alternative Act allows fleets of nine or more heavy-duty (over 14,000 pounds GVWR) diesel-powered vehicles to self-certify their emissions compliance.

Begin by downloading and installing the required files on your computer:

Instructions for downloading the Self-Cert Program

Note: These instructions assume you're already familiar with your computer, your version of the Windows operating system and your Web browser. If you need help with any of these, please contact your system administrator. It may be useful to print out this page so other pop-up windows don't obscure these instructions.

If you have questions about this process, please contact Raymond Elick:



For new users of the DFSCP software:

  1. Click on the DFSCP NEW INSTALL file to automatically download it to your computer. When the computer prompts you, save this folder to your C: drive.
  2. After saving the folder, right-click on it and choose the Extract tool. Once the files have been extracted, save them.
    Note: It's important to make sure the unzipped folder is named DFSCP and resides directly on your computer’s C: drive, and not in any other drive or folder.
  3. Delete the zipped folder from your C: drive.

For current users of the DFSCP software:

  1. Open your existing DFSCP “dashboard” and look at the top right corner of the dashboard. The software version number should be visible. If the number isn't 14339, you should update the software using the following steps.
  2. Before updating, save a copy of your “FleetVehicleInventory.txt” text file to a separate drive (like a USB “thumb drive”) or disk (like a CD) for safekeeping.
  3. To update to the latest software, click on the DFSCPFleetVehicleInventory.zip file to automatically download the “zipped” folder to your computer.
  4. After the software finishes downloading, select the Open option and save the folder to your computer’s desktop.
  5. Right-click on the zipped DFSCP folder and choose the extract tool. This will make a new folder with a functional copy of the application.
  6. Save the functional copy of the application to the existing C:\DFSCP folder on your computer. The software is named AP_MS_DFSCPFleetVehicleInventory.exe (file type is “application” or “executable”).
  7. Open the “dashboard” and verify that it shows the new version number, 14339, in the upper right-hand corner.
  8. Delete any older versions of the dashboard on your computer and any shortcuts on your computer’s desktop.
  9. Create a shortcut to the new application and move it to the desktop.
  10. Once the installation is complete, delete the DFSCP folders from your desktop.
Instructions for installing the CD (available at Emissions Technical Centers)

CDs are available at the following locations:

Denver Emissions Tech Center - 2450 W 2nd Ave.

Aurora Emissions Tech Center - 15608 E. 18th Ave.

Fort Collins Emissions Tech Center- 835 Southeast Frontage Rd.

Greeley Emissions Tech Center - 2844 W. 30th St.

  1. Insert the CD into the CD drive on the computer. When the window appears showing the CD's contents, RIGHT-click on the "DFSCP" folder and select "Copy."
  2. Open Windows Explorer (i.e., the file manager, and not any web browsers):
    - Click on the Windows "Start" button and select the "Documents" option.
    - Click on any folder icon on your Desktop.
  3. Navigate to your C: drive, RIGHT-click in the C: drive window, and select "Paste" from the pop-up menu to copy the "DFSCP" folder to your computer. Make sure the folder is dropped on the C: drive and not in another folder.
  4. When the "DFSCP" folder appears on your C: drive,
    double-click on that folder to open it.

    Your "DFSCP" folder should now show the following:
       - An "Operating Files" folder,
       - A "DFSCPFleetVehicleInventory" application,
       - A "FleetVehicleInventory" text file, and
       - A "FleetVehicleInventory" spreadsheet file.

    NOTE: If a "DFSCPFleetVehicleInventory" file (with a File Type of "File" - no extension) also appears in this folder, you can disregard it.

    - Your "OperatingFiles" folder should now show the following:
       - A "FleetName" text file,
       - A "FleetNumber" text file, and
       - A "LastSubmissionYear" text file.
  5. You are now ready to run the application. Return to the previous page and continue with the Instructions for entering fleet data.

If you have any questions with this process, please call the Diesel Program staff at the Denver Emissions Technical Center: 303-744-2522. 


Instructions for entering fleet data
  1. To run the program, open Windows Explorer (i.e., the file manager for your computer, and not any Web browsers).
    a. Navigate to your C: drive, open the "DFSCP" folder.
    b. Double-click on the "DFSCP Fleet Vehicle Inventory" application icon.You may also have to click an additional “Run” or similar button in order to start this application. A green pop-up window should appear.

    NOTE: The latest version of this software is Version 14339, as shown in the upper-right corner of this window. If you are not using Version 14339 of this software, then follow the installation instructions at the top of this page before proceeding with any data entry.
  2. Click on the white "Add vehicle to inventory" button in the upper-left of the window. The background of the required fields will change to white.
  3. Begin entering the appropriate information for each vehicle in your fleet (you can hover your mouse over some fields to find more information about what to enter in that field):
    Fleet Number (You only have to enter this four-digit number the first time, it will appear automatically each time you add another vehicle).
    Fleet Name (You only have to enter this the first time, it will appear automatically each time you add another vehicle).
    Date: Click in this field to default to today's date.
    Fleet vehicle inventory for year: Click in this field to default to this year.
    VIN: Enter the vehicle identification number in the correct format (If you enter the VIN in a different format, a pop-up window will appear asking to verify it).
    Vehicle Year: Once you enter a valid VIN, then the vehicle's model year will appear automatically.
    Vehicle Make: Choose the vehicle’s make from the drop-down list.
    Vehicle Type: Enter the vehicle type (Truck, Trailer, etc.).
    GVWR: Enter the Gross Vehicle Weight Rating (in pounds, which must be a number between 14001 and 999999).
    Unit Number: Enter the vehicle’s Unit Number.
    License Plate Number: Enter the vehicle’s license plate number. If the vehicle has no license plate, then enter "XX" and the last five digits of the VIN.
    State: Select the vehicle's state of registration from the drop-down list.
    Test Type: Depending on the vehicle year you entered, this field will already be filled in with one of the following:
    Test Scheduled This Year: Depending on the vehicle year you entered, this field will already be filled in with YES or NO.
  4. When you’re finished entering all of the required information for a specific vehicle, click on the blue "Save" button that appears in the lower-right corner of the window.This will save this data in the "Fleet Vehicle Inventory" text file in your "DFSCP" folder.
  5. Repeat Steps 2-4 for each vehicle in your fleet.You only need to enter all information for each vehicle the first time. Future reporting will require only editing of existing vehicle information (e.g., new license plate numbers, etc.), and should take much less time to complete.
  6. To remove a specific vehicle from your inventory list, click on the red "Remove vehicle from inventory" button in the upper-right corner of this window. Enter the VIN in the pop-up window that appears, and then click on the "OK" button.
  7. Optional: If you have Microsoft Excel on your computer, then you can click on the green "Export to Excel" button near the upper-right corner to export information you've already entered to a copy of the "Fleet Vehicle Inventory" spreadsheet in your "DFSCP" folder. This spreadsheet would be for your own internal use, and is not a means for exporting your fleet information to us.

  8. The gray "Annual Update of Vehicle Inventory" button is used to update the status of the opacity test required (YES or NO) field in your electronic inventory. Updating the test required status must be done prior to completing your Fleet Compliance Plan and submitting your electronic inventory for the following year. The button is only operational between November 1 and December 31, and can only be used once per year. The annual update should be done prior to adding vehicles to your electronic inventory for the coming year.
  9. When you’ve entered all your fleet information, send the "Fleet Vehicle Inventory" text (.TXT) file as an attachment in an e-mail message to cdphe_xmprogram@state.co.us
    Be sure to include the underscore in the address.
    Attach only the "Fleet Vehicle Inventory" text file to this message, and don’t attach any Excel spreadsheets or other files.
    Please do not send any printed fleet information to us in the U.S. Mail.



If you have any questions about this process, then please contact CDPHE’s Diesel Program at 303-744-2522 or raymond.elick@state.co.us.