Company, facing millions of dollars in potential fines, says its "2010 transition was appropriate."
Kenworth and Peterbilt trucks were using the same brake component that affected production of Navistar and Volvo Group trucks.
Paccar, Navistar and Volvo have deferred shipments of Class 8 vehicles equipped with the faulty part.
California Air Resources Board had issued a public letter to Navistar saying the company's emissions credits for the engine will expire Feb. 29.
Company says it stopped Class 8 truck production in mid-December until the problem can be remedied. Paccar and Volvo trucks also are affected.
Navistar is developing natural gas-powered engines for Class 7 and Class 8 trucks and Clean Energy is building LNG fueling stations.
Three compete for Owner-Operator of the Year, cross-border program lawsuits advance, turnpike rates rise, Baltimore bridge tolls rising and many more industry news items are featured.
Agency's executive order says emission credits allowing sale of engines run out Feb. 29.
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