Problems after dead batteries and jump start

ashcraftd

New member
Nov 15, 2021
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I have a 2008 Silverado 2500HD Crew Cab (LMM) with ~145k miles. Truck is all stock with 2 batteries and 2 alternators and I’ve had zero issues prior to this. I had a parasitic drain on the batteries that would periodically draw the batteries down, but never low enough to affect starting. The first indication of a low battery was the dual climate control would reset to 74/74. Recently the truck sat about a week and finally went low enough to not crank. I jump started at the passenger side battery and the truck started and runs fine. However, since that jump start, or maybe since the batteries went dead, I have the following 4 conditions, and no codes stored.

  • Service 4 wheel drive in DIC
  • Service Trailer Brake system in DIC
  • ABS and Emergency brake lights on
  • Park Assist System Off
I have searched and read many post about similar problems, but nothing identical. I haven’t found anything related to a jump start. I have already performed the following steps with no change:

  • Disconnected both batteries for 1+ hour
  • Checked all fuses in cab and engine compartment using a continuity tester
  • Checked TREC fuse and removed/replaced it while key is on (Click sound when replacing it)
  • Attempted TCCM re-learn multiple times with no success. No sound, movement or shift occurs
  • Replaced both batteries with new identical H6 batteries
So far nothing has made any change. The truck runs fine and has no other issues. All of these conditions did not exist prior to allowing the batteries to go dead and/or jump start it.
 

ashcraftd

New member
Nov 15, 2021
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Is there any reference to where all the ground points are? I have looked through everything on AllDataDiy and can't seem to find anything
 
Last edited:

ashcraftd

New member
Nov 15, 2021
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The source of the parasitic drain was located and eliminated. The battery type are the OEM H6 series and are both brand new since the dead / jump. I have not yet started to locate and check grounds. However, seeing as this started immediately after the dead batteries and did not exist before, I have a hard time believing that a bad ground condition suddenly developed.

Today I drove the truck about 45 miles. I had zero issues and it runs and drives great. However, these 4 conditions all still remain with no change in them at all. These did not exist prior to the initial dead batteries, so I have a hard time believing that they are real issues rather than faults due to the low battery condition. The OBD scanner I have can only read ECM codes. I'm curious if I had a better scanner which could read and clear codes in BCM, TCM and TCCM if this would resolve them. I expect that a dealer would start throwing parts at it based on the messages and lights.
 

2004LB7

Well-known member
Dec 15, 2010
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Norcal
I would find someone who has a scanner or purchase one that can read those codes. you could clear them and see if they come back
 

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