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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.

Fleets of three or fewer vehicles can take advantage of the small fleet extension that delay clean-up until January 1, 2014. Reporting requirements started in 2012. There is no fee for reporting. For more information see the links under the "Options" heading below.

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


The following are upcoming deadlines:

September 1, 2013

January 1, 2014

  • 2005-06 engine model year diesel vehicles over 26,000 lbs. GVWR must have a soot filter installed, unless reported for an extension.
  • Owners using any of the following extensions below are required to meet a percent of total fleet compliance:
  • School buses must meet 100%
  • Phase-in option must meet 90%
  • Log truck provision must meet 10%
  • NOx exempt must meet 33%
  • Low-mileage construction truck must meet 33%, and
  • Small fleet provision - one truck must have a filter or upgrade to a 2007 engine model year or newer (with filter) to meet compliance.

January 31, 2014

Reporting deadline for:



Link icon What's New?

On April 24th, 2014 the Board approved amendments to the Truck & Bus Regulation


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.

Cleaire Advanced Emission Controls Purchased by ESW Technologies Incorporated


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