Fleet Rule for Public Agencies and Utilities - Verified DECS will not work

This page last reviewed February 22, 2011

There are many diesel emission control strategies (DECS) available for use, built by many different manufacturers. Each DECS is verified for use for specific engine families. It is likely that there is a device available for all of engines in a fleet. However, in order to use a DECS on an engine, the operation of the vehicle must be consistent with the parameters for which the DECS was verified.

For example, a DECS is available for a vehicle based on the engine family in that vehicle, but the device will not work on that vehicle because of technical constraints. Examples of this may include and are not limited to, duty cycle and physical constraints. In this situation, the operator potentially could receive an annual extension until a year past the final compliance deadline for this vehicle.

Here is how:
A municipality or utility may apply to the Air Resources Board for a compliance extension for one or more vehicles for which a DECS will not work because of reasons specified by the DECS manufacturer. All other engines must be in compliance with the regulation before this extension can be utilized. A complete application for this compliance extension MUST be received by the ARB prior to July 31 of the compliance year. Applications received after July 31 will be denied.

The duration of the extension, if granted, is 1 year. Depending on the engine model year (MY) an agency may or may not be able to apply for an extension the following year. Below gives more detail about this compliance extension based on engine MY.

Group 1 (1960 - 1987 engine MY)
The ARB will only grant one (1) extension for a Group 1 engine if a DECS is available but will not work on the vehicle. At the conclusion of the extension, the agency MUST meet BACT for that engine. A complete application for this compliance extension MUST be received by the ARB prior to July 31 of the compliance year. Applications received after July 31 will be denied.

An agency must submit with their application the manufacturer's documentation for why the DECS will not work on their vehicle(s), and complete vehicle records confirming that remaining vehicles in this Group comply with BACT or the remaining vehicles will comply with BACT by the compliance deadline.

For application details please see "Required Information for Application" below.

Group 2 (1988 - 2002 engine MY)
The ARB may grant an extension each year an application for an extension is submitted, up to submittals through July 31, 2011. After which the engine must meet BACT by December 31, 2012. An application for a compliance extension, as described above, must be complete and received by the ARB prior to July 31 of the compliance year for approval.

An agency must submit with their application the manufacturer's documentation for why the DECS will not work on their vehicle(s), and complete vehicle records confirming that remaining vehicles in this Group comply with BACT or the remaining vehicles will comply with BACT by the compliance deadline.

For application details please see "Required Information for Application" below.

Group 3 (2003 - 2006 engine MY)
No extensions are provided for Group 3 vehicles under this extension.

Required Information for Application
The application is a letter to the ARB requesting approval for the compliance extension. Certain information must be contained in the letter in order for ARB to grant an extension. The information below is required for ALL applications.

  • The reason for the extension request
  • A copy of the statement of compliance
  • Information required for vehicles which extension is requested: Vehicle Identification Number (VIN),
    - Engine Manufacturer,
    - Engine Model-Year (MY),
    - Engine Family and Series, and
    - Vehicle Description.
  • Data from the manufacturer or authorized dealer that shows the DECS will not work on engine and vehicle combination.
  • List of manufacturers or distributors contacted. All verified DECS for your engine families must be pursued. A verified DECS must be applied, unless data from the manufacturer or authorized dealer shows the DECS will not work on engine and vehicle combination.
  • Fleet vehicle records for remaining vehicles in fleet, detailing compliance status for these remaining vehicles.

And if claiming the DECS will void the original engine warranty,

  • A statement from the manufacturer or authorized dealer stating the DECS will void the original engine warranty.

All applications submitted to the ARB MUST contain this information and the applications MUST be submitted to the ARB prior to July 31 of the compliance year. Please keep in mind that all other vehicles (other than those for which the extension is requested) must meet BACT or the agency must intend to and meet BACT for all other vehicles as required.


Please address letter to:
Chief, Heavy Duty Diesel In-Use Strategies branch
P.O. Box 2815
Sacramento, California 95812

preload