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def exhaust system

  1. 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...
  2. 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...
  3. 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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