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1-16 of 16 Results
  1. General Discussion
    Hi everyone, I am new to this forum and to owning a 2018 l5p and therefore also new to using def. I bought 2 jugs of blue platinum (haven’t dumped them in yet) but red in a few spots that the regular blue and blue platinum is harmful to the newer diesels sensors. Any info on what everyone is...
  2. General Discussion
    What are these plugs really for , do you need a tuner to runs these ?
  3. Build Threads
    1GC4YUEY6LF168615 Hoping to get the build sheet for this truck. Also, any information regarding the service bulletin concerning the DEF system, I have heard there is currently no dealer fix for the issue. Any information is greatly appreciated. Will
  4. General Discussion
    MY 2021 CHEVY 3500HD IS SITTING AT DEALER ...THREE WEEKS NOW WAITING FOR NATIONAL BACK ORDERED PART 85138746 DEF SYSTEM. I AM STILL MAKING PAYMENTS ON THIS AND CAN'T USE IT. DOES ANYONE KNOW OF A WAY TO BYPASS THIS SYSTEM SO THE TRUCK IS STILL USABLE IN THE MEANTIME? I CANT GO MONTHS...
  5. 11-16 LML Duramax Powertrain
    Thanks
  6. 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...
  7. 2020+ GM T1 Platform Powertrain
    I have a new 2021 AT4 Duramax. I filled the DEF fluid for the first time (it has about 2300 miles on it) When I started it to leave the station, the check engine light was on. I drove it home (6 miles) and it didn't go off. Could this be related to filling the DEF tank. I guess it's possible...
  8. Gauges, Electronics and Wiring.
    Hey everyone new and fresh to this forum and to diesels in general. Apologies if this is in the wrong category. I have a 2013 Chevy Express 3500 Ext. 6.6L LGH Duramax of course with all that lovely DEF system joys. Had a crap load of codes that came shortly after i bought it recently and was...
  9. 2011-2016 (Non Powertrain)
    Hi guys, this is my first post. My DEF heater went out not long after i got my truck; got lucky, beat the warranty by less than 2k miles. 2 years later (October 2020), goes out again-'Service DEF System', code P20C3. '99 miles until 65 mph' countdown begins. Get it fixed at a local shop-1 week...
  10. 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...
  11. 2017 - '19 (Non Powertrain)
    Been pretty go by the rules, just drive my Duramax. I recently took my truck to Cabo San Lucas in Mexico, and jumped a big rock and busted my DEF tank, and all the fluid leaked out. I've found a mechanic here that at least understands what I am talking about, but afraid to here his timeline to...
  12. 11-16 LML Performance Parts Discussion
    Needing some insight on 2013 lml bone stock not deleted. Here's what i have going on: When idling for a while (hooking up camper) or towing camper at 9,000lbs for roughly hour and a half in tow mode exhaust brake "coolant level low add coolant" comes on. Level seems right at about sensor level...
  13. 2017-19 GM T-K2 Platform Powertrain
    My 2019 Chevy Silverado 2500 HD Duramax High Country makes a loud clicking noise 95% of the time I’m at idle or a slow roll. It’s loud, annoying, and makes my beautiful new truck sound like a heap of trash. Loud reflecting clicking at drive through. Pull up to friends and roll window down to say...
  14. Performance Upgrades
    I recently bought a 2011 GMC 2500 Duramax. I've worked at Lou's Custom Exhaust for the last eight years and I've done a million diesel systems. However, I've never seen anything like the exhaust on my truck because it has the diesel exhaust fluid injector. I'm stumped on where to start, not...
  15. 11-16 LML Duramax Powertrain
    Has anyone tried or heard anything about relocating the DEF tank??
    def
  16. 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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