Truck and Bus Regulation Reporting
On-Road Heavy-Duty Diesel Vehicles (In-Use) Regulation

This page last reviewed December 19, 2018




Impact from the California Trucking Association (CTA) / Lawson Lawsuit:

Lawson/CTA filed a lawsuit against the California Air Resources Board to void the 2014 Amendments. The court ruled in favor of Lawson and CTA to rescind the amendments and as a result, some flexibility options that were previously available have been modified or removed. This user-guide will provide information regarding the options available for the 2019 compliance year; however, it is the sole responsibility of the vehicle owner to understand the regulatory requirements as they apply to their vehicle(s).

2019 Compliance Requirements (see the Click for Help document for detailed compliance information such as geographical limitations or mileage limits)
  • All lighter vehicles (GVWR between 14,000 and 26,000 lbs.) with a 1999 or older model year engine must be retired, or upgraded with a 2010 or newer model year engine unless the vehicle is using a flexibility option that excludes it from the upgrade requirement such as the low-use option or the NOx extension.
  • Fleet owners using the Log Truck Phase-In option must upgrade 60% of the vehicles to 2010 or newer model year engines to comply with the January 1, 2019 compliance deadline. The opt-in deadline for this option has passed.
  • All heavier vehicles (GVWR 26,001lbs. or more) with a 1995 or older model year engine with a PM Filter Retrofit installed to comply with:
    • Low Mileage Construction Truck (LMCT) vehicles must remain under the applicable mileage limit based on vehicle body type, or
    • NOx Exempt Attainment Area extension must remain inside the designated NOx counties.

Who Needs to Report for the 2019 Compliance Year?

Vehicles in Compliance with the Engine Model Year Schedule do not need to report. Fleet owners of vehicles using mileage-based options must report the vehicles end of the year odometer reading annually and update the compliance path if they wish to continue using the option for the following compliance year.

Vehicle owners that wish to use a flexibility option in the regulation must report to identify which vehicles will use an option for the duration of the compliance year to delay the vehicles upgrade requirements and provide any additional information specific to that option.

A vehicle must meet the eligibility criteria to use an option and meet any upgrade requirement by the deadline. Fleet owners using mileage-based extensions must provide their December or January odometer reading and read date as close to January as possible of each compliance year in addition to confirming whether they will continue to use the same mileage-based extension for 2019. Following is a list of compliance options that are currently available:

Low Mileage Construction Truck w/PM Filter
Low-Use Exemption
Manufacturer Delay
NOx Exemption w/PM Filter

Verification of eligibility of claimed flexibility options is continuously enforced. This is accomplished by CARB staff reviewing third party documentation, in addition to verification programmed into TRUCRS and Enforcement staff who possess the authority to place holds on vehicle registration. Fleets must keep records and provide proof in a timely manner to CARB staff upon request or the reporting account could be blocked which disables the ability to print a certificate.

If you failed to meet the eligibility requirements of an option or extension for a given vehicle, you must bring the vehicle into compliance by retrofitting or retiring the vehicle as specified by the engine model year schedule. You will not be eligible to claim another flexibility option in any future compliance year. You also need to report changes to your fleet within 30 days throughout the year when selling or adding vehicles.

NOx Exempt Area Extension
The counties that will continue to be considered in the NOx Exempt Area are: Alpine, Colusa, Del Norte, Glenn, Humboldt, Lake, Lassen, Mendocino, Modoc, Monterey, Northern Sonoma, Plumas, San Benito, San Luis Obispo, Santa Barbara, Santa Cruz, Shasta, Sierra, Siskiyou, Tehama, Trinity, and Yuba

Counties removed from the NOx Exempt Area are: Amador, Butte, Calaveras, Kern, Inyo, Mariposa, Mono, Nevada, and Tuolumne along with the portions of Sutter, El Dorado, and Placer.
All vehicles using the NOx Exempt Area Extension must now have a PM Filter Retrofit Installed. After installation of the PM Filter, the vehicle will be exempt from the replacement requirement as long as the vehicle does not leave the NOx areas and is reported as using "NOx Exempt with a PM Filter".

Low Use Exemption
The low use mileage limit is reducing one year earlier than expected because of the rescinded amendments. A Low Use vehicle is one that operates less than 1,000 miles a year in California and 100 hours of power take off (PTO) annually to remain exempt from the clean-up requirements of the Truck and Bus regulation.

Ag Vehicle Extension
Beginning January 1, 2019 the annual mileage limit will be 10,000 miles. Vehicles that travel below 10,000 miles annually and have not exceeded prior mileage threshold may continue to use the Agricultural mileage extension until January 1, 2023.

Agricultural Vehicle Extension for Cattle Livestock Trucks
Cattle livestock trucks with a GVWR greater than 33,000 or tractor-trailer combinations that exclusively transport cattle with a livestock module no longer have a body type eligible for the specialty AG option.

Low Mileage Construction Truck (Formerly Low Mileage Work Truck)
This option is no longer available to lighter vehicles with a GVWR 14,001-26,000lbs. Only vehicles with a PM filter (OEM or retrofit) may continue to use this option. Vehicles using the Low Mileage Construction Truck option that have a PM filter retrofit installed on a heavier vehicle with a 1995 or older model year engine, must continue to report to delay upgrading to a 2010 model year or newer engine by reporting the vehicle as low mileage construction truck with a filter, operate less than 20,000 miles annually, and report the vehicle's odometer reading annually.

A 15,000-mileage threshold now applies to any vehicle owned by a company that possesses a valid contractor's license, or if the vehicle is a concrete mixer, concrete boom truck, water tank truck, or exclusively pulls a lowboy trailer. Dump trucks designed to transport construction material are still subject to the 20,000-mileage threshold.

Early Retrofit Credit
Owners of vehicles without a PM Filter Retrofit requirement that installed a PM Filter on their vehicle in lieu of replacement must be replaced no later than January 1, 2020.

Vehicle owners that installed a PM Filter on some of their vehicles by January 1, 2014 but did not install the filter on all their vehicles are will need to replace the vehicle per the Engine Model Year Schedule.

Vehicle owners that installed a PM Filter retrofit on all of their heavier or all of their lighter fleet by January 1, 2014 and reported the installation by January 31, 2015 may maintain the credit that delays the vehicle replacement date until January 1, 2023 by contacting TRUCRS staff at 866-634-3735.

Options Removed from the Truck and Bus Regulation When the 2014 Amendments Were Voided

Heavy Crane Phase-In Option:The phase in option that allowed heavy crane owners to exclude their heavy cranes from the general compliance requirements of the Truck and Bus regulation and phase in replacement vehicles from 2018 until 2027, in addition to the credit provided to crane owners who took early action to comply is no longer available.

25 Percent Replacement Limit:: The added flexibility for fleets using the engine model year schedule to limit replacements to no more than 25 percent of the fleet, but no less than 2 trucks within one compliance year is no longer an option


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