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As of January 1, 2023, heavy-duty trucks and buses with engines from model years 2007 to 2009 operating in California must be either:

  • Replaced, which involves replacing the vehicle with a vehicle that is equipped with an engine meeting the 2010 emissions requirements, or
  • Retrofitted, which involves replacing the vehicle’s engine with an engine meeting the 2010 emissions standards, including installing a diesel particulate filter and selective catalytic reduction unit.

This is the final step in the phase-in of the Truck and Bus regulation. Covered vehicles originally built with engines older than model year 2006 must have already been replaced or retrofitted.

But I can't find a vehicle!

One issue that has come up is new vehicles are not available for delivery before January 1, 2023. This means fleets that operate in California that cannot get a replacement vehicle will be faced with the choice of either retiring their 2007 to 2009 engine vehicles without a replacement or operating in violation as of January 1, 2023.

However, the California Air Resources Board (CARB), the agency that oversees the Truck and Bus program, is aware of the situation and has provided an exemption. If the company has a written contract to purchase a new vehicle to replace a vehicle with a 2007 to 2009 engine in place before September 1, 2023, the existing vehicle can be operated until the replacement is placed in service.

Reporting requirements

To use this exemption, the company must register in CARB’s Truck Regulation Upload, Compliance, and Reporting System (TRUCRS) and report the use of the exemption. This is especially important to California-based companies as vehicle registration is tied to compliance with the Truck and Bus regulations requirements.

Also starting in 2023

As of January 1, 2023, California will be placing roadside emissions monitoring devices (REMD) at locations around the state. These devices check emissions on any vehicle that passes it. If the device determines a vehicle may be a high emitter, the owner will receive a Notice to Submit to Testing. This will require the vehicle to be brought in to a “referee” location where the emissions and emissions components can be inspected.

Key to remember

These Truck and Bus requirements go into effect on January 1, 2023, and only apply to vehicles operating in California.