Recent content by Reecedakid03

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

    ive checked the rear frame grounds and all body metal ive touhced has been true ground. its only in the computer and relay control side of things that ive found so far. every module behaves the same except bcm i didnt see any issues with it.
  2. R

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

    The only blown fuse I’ve found is for the air compressor. I’d think if there was a short to ground it would blow a fuse but maybe not. I tried grounding the ecm to the engine block and that didn’t change anything. I’ll try grounding batt to body and batt to frame. I just don’t understand how it...
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    2009 Tahoe harness has power with battery neg disconnected and power to ground short issue.

    It’s my power probe I’m testing it with
  4. R

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

    Yes alternator body is always constant ground and my battery terminal always has good constant ground. I’ve checked the firewall ground too
  5. R

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

    I can’t send video but the neg is disconnected and my green relay control wire off the ecm harness is still 11.8v. Seems impossible to me too I’m just as confused lol
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    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...
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    2009 tahoe fan and pcm grounding issue

    I’ve found the intermittent ground/.1- 2v signal on the radio harness, seat harness, relay control circuit that controls all engine grounds. If I unplug the neg battery terminal my fuse block still has 11.3 volts so something with a capacitor is back feeding short to to ground only with key on...
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    2009 tahoe fan and pcm grounding issue

    all wiring ive seen looks good ive pulled the ecm off and checked the pins for corrosion etc and the fan connectors as well. i pulled off my front bumper and checked the grounds on both lower core support mounts and those have good consistent ground signal and checked all other engine grounds...
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    2009 tahoe fan and pcm grounding issue

    Thank you for the help!
  10. R

    2009 tahoe fan and pcm grounding issue

    Thank you much!!!
  11. R

    2009 tahoe fan and pcm grounding issue

    Found the coolant temp sensor wire has the same intermittent ground issue as well
  12. 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

    Battery is good. But I did notice if I turned the wire boot on the inside of my dr door the switches stop working maybe it’s a short in that harness but idk how that would bypass all other chasis grounds unless it’s enough to make all the grounds have voltage
  14. R

    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

    Awesome, thanks. I’ll give it a look!
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