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

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.

In the present investigation, temperature sensitivity of the oxygen sensor was measured over a wide range of engine operating conditions. Sensor data were plotted in the form of contour lines of ...