Electrical Gremlin

Discussion in 'Audio & Electronics' started by Kurt MacIntosh, May 15, 2019.

  1. Kurt MacIntosh

    Kurt MacIntosh TYF Newbie

    Posts:
    4
    Likes Received:
    0
    Joined:
    May 14, 2019
    Name:
    Kurt
    Need some help.

    My 07 Yukon has multiple warning lights and warning messages. It has intermittent gauges and it seems to be even effecting the rear suspension compressor.

    I was able to pull some codes last night which were pointing to loss of connection to the TCM, but tonight it won't even pull those.

    I have cleaned all the grounds and don't want to just start changing modules without some direction.

    Any ideas?
     
  2. Kraig

    Kraig Full Access Member

    Posts:
    131
    Likes Received:
    46
    Joined:
    Nov 21, 2015
    Name:
    Kraig
    I’d start with the Big 3 upgrade to the grounds.
     
  3. Mickey_7106

    Mickey_7106 Full Access Member

    Posts:
    94
    Likes Received:
    24
    Joined:
    Oct 22, 2018
    Location:
    Bay Area
    Name:
    Mickey
    You probably have a bad connection somewhere. I remember on my C5 i would loose connection to the BCM. Turned out it was a wire that was coming loose from its plug in the passenger door wire conduit.


     
  4. Kurt MacIntosh

    Kurt MacIntosh TYF Newbie

    Posts:
    4
    Likes Received:
    0
    Joined:
    May 14, 2019
    Name:
    Kurt
    Thank you. What is the Big 3 upgrade? I cleaned the contacts on the grounds under the hood.
     
  5. Kurt MacIntosh

    Kurt MacIntosh TYF Newbie

    Posts:
    4
    Likes Received:
    0
    Joined:
    May 14, 2019
    Name:
    Kurt
    Thank you. How many different modules are there and where are they located. The only one that I have located is the one under the dash left of the steering wheel. I removed and reseated that plug. I removed and reseated the one at the TCM, but not the ECM. Its a pretty strange problem and I thinking along the lines of you are saying. Just haven't been able to find info on the BCM locations if there are multiple.

    Do you know where I could get a copy of the wiring diagram?
     
  6. Mickey_7106

    Mickey_7106 Full Access Member

    Posts:
    94
    Likes Received:
    24
    Joined:
    Oct 22, 2018
    Location:
    Bay Area
    Name:
    Mickey
    i have no idea, I'm pretty new to this vehicle too


     
  7. Kraig

    Kraig Full Access Member

    Posts:
    131
    Likes Received:
    46
    Joined:
    Nov 21, 2015
    Name:
    Kraig
    Big 3 adds ground cables in the engine compartment to ensure you don’t have grounding issues. These trucks do all sorts of weird stuff when the grounds aren’t 100% and adding a few cables is cheap insurance against those problems
     
  8. Kurt MacIntosh

    Kurt MacIntosh TYF Newbie

    Posts:
    4
    Likes Received:
    0
    Joined:
    May 14, 2019
    Name:
    Kurt
    Thank you. I'm going to try that and go through the harness from end to end to ensure nothing is loose.
     
  9. Doubeleive

    Doubeleive Supporting Member

    Posts:
    5,563
    Likes Received:
    3,948
    Joined:
    Nov 7, 2017
    Location:
    Stockton, Ca.
    Name:
    Wes
    another thing you can check is pull the fuse box off and check for corrosion on the contacts
     

Share This Page