GM has reissued a service bulletin describing a fix for several possible problems found in several 2020 through 2024 Chevrolet models, including the Chevy Silverado pickup truck, Chevy Tahoe SUV and ...

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 ...