The DEF level sensor of the affected Chevy Silverado, Tahoe and Suburban vehicles with Duramax engines may read incorrectly, function erratically, or become stuck.

If you’ve had your diesel RV or tow vehicle suddenly lose power because of a DEF (diesel exhaust fluid) issue, you’re not alone. And now, the EPA is stepping in with changes that address this problem.

GM has issued a service bulletin for a DEF sensor problem fix for the 2020 to 2024 GMC Sierra 1500, GMC Sierra HD, and GMC Yukon involving module recalibration.

Issues that can arise with out-of-spec diesel exhaust fluid include the perhaps most obvious one — improper urea concentration, which at a drastic-enough level can trigger derating of the engine ...

The Environmental Protection Agency (EPA) announced a revision to diesel exhaust fluid (DEF) guidelines to prevent diesel on-road trucks and off-road equipment from severe power loss after running out ...

This change will let operators fix issues without their equipment shutting down, write the EPA's Lee Zeldin and the SBA's Kelly Loeffler.