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  1. 11-16 LML Duramax Powertrain
    The other day, my truck threw a code for a bad NOx sensor #1. Triggered the "Service Exhaust Fluid System..." Countdown to limp mode warning on the dash as well. Cleared the codes, but the one for the sensor came right back immediately. Typical.... Ended up replacing the sensor for a nice...
  2. 11-16 LML Duramax Powertrain
    My 2013 3500HD has the dreaded "Exhaust Fluid Quality Poor" message and the DEF light. Since I already had it, I replaced the downstream NOX sensor. I replaced the upstream NOX sensor a year ago. I cleared the P20EE and P2BAD codes and drove the truck about 20 miles to make sure it's up to...
  3. 11-16 LML Duramax Powertrain
    My DEF system never did read how much DEF I actually had in the tank. Hopefully got it fixed today and I did learn a few new things that GM sent out to the mechanics very recently. This could be stuff you already know, but I doesn't hurt to try to give some facts. The new GM suggestion for...
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