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This page last reviewed April 15, 2009 Software Upgrade for Diesel TrucksWhat is Low NOx Software Upgrade?Low NOx software upgrade is computer programming for electronic control modules in certain heavy-duty engines that reduces excess emissions of oxides of nitrogen (NOx). Owners of most 1993-1998 model year California registered heavy-duty trucks, school buses, and motor homes, and interstate vehicles that visit California, with engines manufactured by Caterpillar, Cummins, Detroit Diesel Corporation, Mack/Renault, Volvo and International can reduce the emissions of their vehicles by having low NOx software installed. When installed, the low NOx software reduces NOx, a component of smog that can damage lungs.Installing Low NOx Software
Low NOx Software Upgrade Status (posted January 9, 2007)Regulation Declared InvalidThe Sacramento County Superior Court has ruled that the Low NOx Software Upgrade Regulation is invalid. The ARB will not appeal that ruling and is suspending further enforcement of this Regulation. The Court's ruling does not invalidate the required installation of low NOx software at the time of engine rebuild. The ruling also does not preclude voluntary efforts to reduce NOx emissions through the installation of low NOx software. The ARB encourages all voluntary efforts to have the software installed. Manufacturers Will Continue to Provide Low NOx Software at No Charge Engine manufacturers will continue to provide eligible truck owners in California with reflashes upon request. Specifically, engine manufacturers, working through their authorized dealers, distributors and repair facilities, will continue to make available and install at no charge "Low NOx Rebuild Kits" in all covered "Low NOx Rebuild Engines" whenever requested or agreed to by any owner/operator of any reflashable vehicle in California, not just at the time of engine rebuild. ARB acknowledges and appreciates the engine manufacturers' willingness to go beyond that which otherwise is required of them. Fines Collected for Low NOx Software will be Reimbursed ARB is also reimbursing truck owners/operators for fines that ARB collected for not having the Low NOx Software installed. ARB is in the process of determining an appropriate procedure for refunding payments, and will notify owners/operators due for reimbursement by letter as soon as the procedure is established.
Low NOx Software
Upgrade Program 2007 Frequently Asked
Questions (posted
January 9, 2007)
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| Authorized Dealers | Eligible Engine List | Background | Voluntary
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