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  1. Home
  2. Vehicle and Engine Certification

Certification for Nonroad Compression-Ignition (NRCI) Engines

Related Topic
For all nonroad, see:
  • Nonroad Vehicles and Engines

Follow these steps for certification.

STEP 1: Confirm that you have access to EV-CIS.

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

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' broadcast notifications).

STEP 3: Review all applicable regulations.

Regulations provide requirements for certification and compliance.

Regulations
Review the following:
  • 40 CFR Part 89
    Control of emissions from new and in-use nonroad compression-ignition engines.
  • 40 CFR Part 1039
    Control of emissions from new and in-use nonroad compression-ignition engines.
  • 40 CFR Part 1065
    Engine testing procedures.
  • 40 CFR Part 1068
    General compliance provisions for highway, stationary, and nonroad programs.
Selected Guidance Letters
Review selected guidance letters:
  • Information about Family Naming Conventions
  • Certification of Nonroad Diesel Engines Equipped with SCR Emission Controls (pdf) (8 pp, 119 KB, May 12, 2014)
  • Transient Emissions Testing of Nonroad Compression Ignition Engines below 19 kW (pdf) (3 pp, 30 KB, August 6, 2012) 
To search all guidance letters, go to:
  • EPA's Transportation and Air Quality Document Index System (DIS)

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 application materials.

For each model year for a family, you must provide the applicable certification dataset and supporting materials.

Support Documentation for Submissions

Materials Specific to NRCI

  • Support files for NRCI certification
    Includes models and parts template, standards decision table, and calculations spreadsheet.
  • System documentation for NRCI
    Includes data requirements, business rules, schema, and schema change log.
  • Presentation on selective catalytic reduction (SCR) certification for NRCI engines

Materials for All EV-CIS Users

  • Software release notes for EV-CIS
  • EV-CIS documentation for request for certificate (RFC) module
    Includes data requirements and business rules.
  • EV-CIS documentation for cross-industry services
    Includes data requirements and business rules.

STEP 6: Submit the completed certification 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 dataset 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 Engine Family.

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

Additional resources:
  • For more about submitting an RFC, see: Webinar for NRCI and Locomotives

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.

Vehicle and Engine Certification

  • Onroad
  • Nonroad
  • EV-CIS
Contact Us about Vehicle and Engine Certification
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on May 6, 2025
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