GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 5 of 5
  1. #1

    Default 08 electrical issue

    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!!

  2. #2


    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".

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3


    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.

  4. #4


    Wow, crazy but does make since for all of that to go bad at the same time.
    Tim Walters (Curky)

    Wrangler AT/S 265/70R17 - Trail-FX window vents - Husky fitted splash guards - Silver Star zXe - Leveling kit -

  5. #5


    Holy crap. It's like war of the worlds

Similar Threads

  1. Electrical Issue...please help
    By chris8408 in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 4
    Last: 01-15-2012, 01:06 PM
  2. Help! electrical issue...I think?
    By chopper1 in forum General Chevy & GM Tech Questions
    Replies: 6
    Last: 12-17-2011, 08:29 PM
  3. electrical issue
    By tnchevy in forum GM Electrical Tech
    Replies: 2
    Last: 05-29-2011, 09:36 AM
  4. electrical issue ?
    By okysmokey911 in forum Chevy C/K Truck Forum
    Replies: 0
    Last: 06-15-2010, 10:25 PM
  5. electrical issue??
    By GReddy212 in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 3
    Last: 04-04-2009, 08:50 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts