More commonly known as AdBlue, DEF is an additive that mixes with exhaust emissions to neutralize NOx. It is a urea and water ...

But if the fuel gauge leaves us little cause for worrying about the level of our 18.3-gallon fuel tank, the 5.1-gallon Diesel Exhaust Fluid (or DEF) tank is doubly no cause for concern.

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.

GM has issued a service bulletin about a fix now available for the 2020 through 2024 Chevy Silverado, Chevy Tahoe, and Chevy Suburban vehicles for a DEF sensor.

Despite the improvements in getting the fixes made, concerns exist about future availability of replacement sensors for those used in newer trucks and engine families— from model years 2016-2021 ...

BHPian wadewilson recently shared this with other enthusiasts: 47,000 km update of my XUV700: DEF tank was not updating for a few months and had constantly stayed at 36% despite me filling up about 16 ...