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Vehicle and Engine Certification

Certification and Fuel Economy for Light-Duty Passenger Cars and Trucks

Follow these steps for certification.

STEP 1: Confirm that you have access to Engines and Vehicles Compliance Information System (EV-CIS).

You must register with EPA to gain access to EV-CIS for the specific manufacturer code  for which you are seeking certification.
You must also set up an account with EPA to establish the necessary EV-CIS roles.

STEP 2: Update manufacturer information in EV-CIS.

To update information, users must have the "Maintain Manufacturer Information" role in EV-CIS. Otherwise, users will only be able to view  the information.

Information to Update

Updates include (but are not limited to):
  • Industry sector(s);
  • Addresses;
  • Contacts and Industry/Compliance Programs;
  • Test labs; and
  • Notification email addresses (used for EV-CIS's broadcast notifications).

STEP 3: Review all applicable regulations.

Regulations provide requirements for certification and compliance.


Review the following:
  • 40 CFR Part 85
    Control of air pollution from mobile sources.
  • 40 CRF Part 86
    Control of emissions from new and in-use highway vehicles and engines.
  • 40 CRF Part 600
    Fuel economy and greenhouse gas exhaust emissions of motor vehicles.

STEP 4: Pay appropriate certification fees, as applicable.

A fee payment may be required for each certificate issued by EPA.

For more details, go to: Fees Information

STEP 5: Prepare certification and/or fuel economy application materials.

For each model year for an Engine Family, you must provide the applicable certification dataset and supporting materials.

Support Documentation for Submissions

Materials Specific to Passenger Cars and Trucks

Materials for All EV-CIS Users

STEP 6: Submit the completed certification and/or fuel economy application materials in EV-CIS.

Login to EV-CIS through the CDX portal: Central Data Exchange (CDX)

Click the applicable industry role on the MyCDX homepage.

Submit the completed certification and/or fuel economy dataset(s) and upload any required supporting materials.

STEP 7: Confirm that your submission(s) from Step 6 were accepted by EV-CIS.

Within a few minutes of all submissions, the submitter will receive a notification in their CDX inbox indicating whether the submission was accepted or rejected.

To access your CDX inbox, click the "Inbox" link on the left navigation bar of the MyCDX homepage.

STEP 8: Submit a request for certificate (RFC).

A CROMERR signer must submit an RFC for each Test Group.

To do so, click the "CROMERR Signer" role on your MyCDX homepage.

Additional resources:

STEP 9: Receive Certificate of Conformity.

The CROMERR signer will receive the certificate in his or her CDX inbox.

To access your CDX inbox, click the "Inbox" link on the left navigation bar.