The engine calibration software's management of the injection of Diesel Exhaust Fluid can allow excessive ammonia into the tailpipe exhaust.
Exposure to high levels of ammonia can increase the risk of injury.
Dealers will recalibrate the engine free of charge.
Owner notification letters are expected to be mailed August 27, 2021.
Owners may contact Cummins customer service at (800) 286-6467.
A Washington, D.C., reporter for more than 30 years, Jim Limbach covers the federal agencies for ConsumerAffairs. Previously, he was a reporter and news anchor for Associated Press Broadcast Services, where he covered business and consumer news as well as space shots and other major spot news events.
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