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  1. 2020+ (Non Powertrain)
    Hi. I have 2020 GMC sierra duramax 6.6L after catalytic thief damage. Looking for some one to help me with wiring location on 3 pin connector(was cut with catalytic). Differential presure exhaust nox sensor. I can check it by my self is some one has 2020+ duramax around Philadelphia PA or...
  2. 11-16 LML Performance Parts Discussion
    My poor def quality light came on and a friend of mine tried to run the regeneration test and scan. 10 minutes into the test it shut off and kicked the scanner out and won’t give a code or reason! We tried two different scanner tools same results any advice is appreciated!!!!
  3. 2020+ LM2 Duramax Powertrain
    My 2021 Duramax with 20K miles randomly gives me the "DEF tank empty" and threatens to reduce my speed. It usually clears itself after a few miles but did go into limp mode once. On that occasion I had the codes cleared and it was fine after a few miles. We are planning a trip to Alaska and...
  4. Duramaxforum.com News
    I have a 2020 Duramax, 90 000km's on my third tank, second pump, and today i went into limp mode with another def fluid problem, is anyone else having this many problems?
  5. Alternative Fuels Diesel Additives Lubricants
    It has come up quite often, especially with the rumors of a DEF shortage now lurking. Figured I would explain this to cover the 30k repetitive questions that have come up First and foremost, regardless of the pretty packaging and nice font that the companies use, GM applications DO NOT work...
  6. TECH Members ONLY
    I could really use some help here. I just started a new job as the mechanic at a concrete company here in San Diego. I've been a shade tree guy my whole life. This is my first job out of the Navy and with all of these diesel fleet trucks, I'm a little out of my depth I think. The company owner...
  7. 11-16 LML Duramax Powertrain
    Earlier this year I dropped $5k on a new dpf system, NOx sensors, and so on. I had purchased the truck used with about 40k on it about a year earlier and added DEF whenever the DIC asked for it. The mechanic who worked on it told me the system may have failed due to running out of DEF in spite...
  8. General Discussion
    I’m DEFinitely not a happy camper. Bought my 2021 Chevy 1500 3L i6 Duramax with the $20K Black Window package from SCA Performance two months ago. At 2900 moles I got the Service DEF system immediately and CEL. Took it in for service and was told the exhaust temp sensor failed or was failing...
  9. 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...
  10. 2020+ (Non Powertrain)
    Hello all, have a question about the def wiring harness for the heaters. I just bought a 2020 3500 Sierra Duramax. Only put 3000 miles on and got the dreaded service def system notice. Took it to dealer and they said the wiring harness torched itself. To top it off they said the part is back...
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