Enforcement Advisory No. 424 for owners of Diesel Trucks operating in California:
The purpose of this advisory is to explain administrative changes in implementing the requirements of the truck regulations consistent with the amendments considered by the ARB on December 17, 2010. The amendments would delay the initial January 1, 2011 compliance date by one year and would defer engine replacement by 2 or more years for most fleets. The regulation applies to nearly all diesel fueled trucks with gross vehicle weight rating (GVWR) greater than 14,000 pounds that are privately or federally owned.
What are the requirements for lighter trucks?
Lighter trucks with GVWR of 14,001 to 26,000 pounds do not have compliance requirements until 2015. Starting January 1, 2015, lighter trucks with engines that are 20 years or older will need to be replaced with newer trucks. Starting January 1, 2020, all remaining trucks will need to be replaced so that they all have 2010 model year engines or equivalent emissions by 2023. Fleets also have the option to install a PM filter retrofit on a lighter truck by 2014 to make the truck exempt from replacement until January 1, 2020, and
any lighter truck equipped with a PM filter retrofit prior to July 2011 can receive credit toward the compliance requirements for heavier trucks in the same fleet.
| Compliance Schedule for Lighter Trucks | |
| Engine Year | Replacement Date |
| 1995 and Older | January 1, 2015 |
| 1996 | January 1, 2016 |
| 1997 | January 1, 2017 |
| 1998 | January 1, 2018 |
| 1999 | January 1, 2019 |
| 2003 and Older | January 1, 2020 |
| 2004-2006 | January 1, 2021 |
| 2007-2009 | January 1, 2023 |
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