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  1. R

    2009 Tahoe harness has power with battery neg disconnected and power to ground short issue.

    my 2009 tahoe has an extremely difficult short to ground issue, ill try to explain best i can. Ill start with ecm and front of truck side, the Lo fan circuit does not work even with fans commanded on but the high side works only if the truck overheats or is commanded on thru obd. the fan relay...
  2. R

    Low oil pressure on cold start and lifter tap, slowly rises to normal with engine temp

    2009 Tahoe 5.3 Low oil pressure on cold start and lifter tap, slowly rises to normal with engine temps and tap also goes away. Got a 2009 Tahoe 240k miles on it. Did an oil change the other day 15w-50 no issues but cold started it this morning (40f) and she was tapping loud and had barely...
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    2009 tahoe fan and pcm grounding issue

    Got an 09 tahoe w an e38 computer. 5.3/6l80e truck and the e fans will not turn on unless commanded thru scanner or truck overheats. The connectors are in good shape but have no power or ground on dr side fan connector and only ground on pass side fan connector. All relays are good and fuses...
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    09 tahoe has .1-.4 volt ground short on body of ecm

    My 2009 tahoe 6 spd 4x4 has 230k miles, I’m having a short/over volting issue in the ecm circuit (have yet to test bcm or any other modules for ground issue) the ground side of my low fan relay has 12v on 1 of 2 ground prongs for that relay. Fans wont run until truck over heats which is what...

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