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Truck and Bus Regulation

Link iconAbout the regulation

  • Requires
  • Applies to
  • Does not apply to
  • Small fleets
  • Deadlines
  • DPF/soot filter requirements begin January 1, 2012.
  • Engine replacement requirements begin January 1, 2015.
  • Requirements vary by Gross Vehicle Weight Rating (GVWR) and by the vehicle's engine model year.

  • Diesel vehicles with a gross vehicle weight rating greater than 14,000 pounds.
  • Privately and federally owned trucks and buses that operate in California.
  • Privately and publicly owned school buses that operate in California.
  • Includes any person, business, school district, tribal reservation, or federal government agency that owns, operates, leases or rents affected vehicles.

The small fleet option is closed. You must have met the requirements and should have already been reported to use this option. Your first truck should have a PM filter installed. The second truck has until January 1, 2017 to install a PM filter. The third truck has until January 1, 2018 to install a PM filter.

For the Basic Compliance Schedule for lighter and heavier trucks see #2 on the Multi-Regulation Summary.


The following are upcoming deadlines:

September 1, 2015

January 1, 2015

January 31, 2015

Reporting deadline for:



Link icon What's New?

2015 Reporting is now available

Click here for new Information about the Amendments and the Economic Hardship Extension! Updated September 12, 2014. 


See the DPF handbook:
A Truck Driver’s Guide to Care and Maintenance of Diesel Particulate Filters.

Question of the Month

This Month's Most Frequent Question! -- I am a small fleet. Is there any extra extension I can use in addition to the Small Fleet Option? -- See the same link for last month's question about how to print a Truck and Bus reporting certificate.


If you need further assistance, please see our quick tips on the Diesel Questions - Need Help? page before contacting us.

The Economic Hardship Extension is a last resort for fleets that were out of compliance for 2014 and have exhausted all of their compliance options. Fleet owners will need to prove they are financially unable to comply with rule requirements.

Take our questionnaire to see if you qualify for the Economic Hardship Extension. Eligibility does not mean automatic approval.