NHTSA Complaint #11600634 — 2017 CHEVROLET SILVERADO 2500

SOLVED my U029E with "Exhaust Fluid Service" and "Reduced Speed". For the past month I have been working on this issue on my 2017 Silverado 2500HD LT 6.6L. Tonight I purchased my 3rd NOX2 (downstream) sensor and IMMEDIATELY EVERYTHING WAS FIXED. So, what happened? Why did the previous 2 NOX sensors NOT work? A clue came from GM Parts Direct as the original part number was listed as "DISCONTINUED". Previously we had purchased 2 numbers matching NOX2 sensors 12676706. So why did these sensors not work when the one see image below immediately worked? CHEVY! They programmed out part number 12676706 from the computer and programmed in 12718676. 12718676 CURED OUR U029E and "Exhaust Fluid Service" and "Reduced Speed" issues. Companies are still selling NOX2 part number 12676706 because it was the original device DO NOT PURCHASE THE DISCONTINUED NOX2 SENSOR 12676706. INSTEAD PURCHASE THE 12718676 PART NUMBER.