Intake Air Temperature #2 (IAT 2) sensor ('06-and-newer applications): Located in the intake manifold, this sensor is used to measure post-turbocharger intake air temperature.

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.

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.