def problems

  1. N

    P1050 after new DEF tank and pump

    I have replaced the DEF tank and pump after my 2017 GMC Canyon 2.8L threw multiple codes. I have gotten those to clear, however, I am trying to run a reductant tamper test and I can’t because it is giving me a malfunction on the tank level. I went in and cleaned all the connections with...
  2. mtxcaleb

    Def pump replaced same issue

    Replaced my def pump connector on pump itself had burnt marks harness did not. Same code and limited speed to 65 dealer said they'd warranty pump/heater but suggest I replace harness anyone else have this issue? Tia
    • mtxcaleb
    • Thread
    • def problems l5p
    • Replies: 2
    • Forum: L5P
  3. H

    LML Urea System Trouble

    Anyone having trouble with excessive urea usage? Or DEF programming? Been back to the dealer 8 times since purchase and have used over 12 gallons in 7K miles.
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