GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER

08 electrical issue

Discussion in 'Chevy C/K Truck Forum' started by nbmech, Aug 10, 2012.

  1. nbmech

    nbmech New Member

    Joined:
    Aug 13, 2011
    Messages:
    3
    Likes Received:
    0
    Hello,
    My 2008 silverado is having some electrical problems.
    I parked it today at 1pm and left the area. When I returned at 6pm I heard a noise and found that the washer fluid pump was running. I also noticed tgat the daytime running lights were on, I disconnected the pump and pulled the fuse for the lights. The battery must be dead as it wont turn over. I am going to charge the battery tonight but need assistance with how to troubleshoot the problem. Any and all help is greatly appreciated!!
    #1
  2. RayVoy

    RayVoy Active Member

    Joined:
    Apr 18, 2012
    Messages:
    2,122
    Likes Received:
    5
    Washer pump and DRLs require key on power.

    You might have a bad ignition switch.

    However, these trucks don't really switch power through the ignition switch any more, they use the BCM, or TCM (Body Control Module, Truck Control Module (some models will call it the BCM, others the TCM, same piece of hardware), as well as the PCM (Powertrain Control Module).

    The ignition switch just tells the modules to "wake up". As long as the "wake up" signal is there, the modules act as expected.

    Perhaps, one of your modules did not "go to sleep".
    #2
  3. nbmech

    nbmech New Member

    Joined:
    Aug 13, 2011
    Messages:
    3
    Likes Received:
    0
    UPDATE...
    It turns out the body control module, transmission control module, transfer case control module and engine control module were all bad. After talking with a neighbor he remembered hearing a close lightning strike. I guess that could have possibly caused the issue. The dealer is asking GM to assist with the repair cost.
    Thanks for your help.
    #3
  4. Curky

    Curky New Member

    Joined:
    Jan 27, 2012
    Messages:
    2,079
    Likes Received:
    6
    Wow, crazy but does make since for all of that to go bad at the same time.
    #4
  5. stratct

    stratct New Member

    Joined:
    Sep 4, 2012
    Messages:
    22
    Likes Received:
    0
    Holy crap. It's like war of the worlds
    #5

Share This Page