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

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.

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.

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 ...

During vehicle operation, SCR systems are designed to provide heating for the DEF tank and supply lines. If DEF freezes when the vehicle is shut down, start up and normal operation of the vehicle ...

While there are a few different designs available for the aftermarket, the ’11-and up DEF Tank Skidplate shown here is from T&A Performance ($599 in bare metal, plus shipping).

Tested on a multi-compartment tank mounted on a 2012 Freightliner M2 chassis, the proprietary epoxy lining has been tested and approved for use with DEF and meets ISO standards, the company said.