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  1. T

    Transmission Dump-shifts, VATS Light On (truck runs and drives).

    This was very helpful, thank you! everything came back clean on the BUS. No bad signals. No clue why the security light is still on or why the truck shifts the way it does. Im replacing the glow plugs next and repairing the circuit to clear that code. Hoping the CEL for the P0380 is the issue...
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    03 LB7 security light

    Want to bring this thing back to life because I’m having the SAME issue and have been for 6 years. But with new emissions rules, I can’t pass smog now anymore because the code comes up before I can get the systems reset and they won’t smog it. (Yes, I hate CARB like everyone else).
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    Transmission Dump-shifts, VATS Light On (truck runs and drives).

    I'm either blind, or the previous owner(s) were digging around and moved a bunch of wires around. I cannot for the life of me find the Class 2 bus comb, ANYWHERE. I have damn near my whole dash on the driver side and it is nowhere to be found. Is it in a different location on the LB7s than other...
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    Transmission Dump-shifts, VATS Light On (truck runs and drives).

    This is a new code I had never seen before. I'll isolate and test the CANBUS system for a bad signal from there.
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    Transmission Dump-shifts, VATS Light On (truck runs and drives).

    Yes, see attached on the original. Im getting P1875 4low switch circuit. And P1642 vehicle speed output. Attributed this to low voltage from battery. Both are fully charged up now. 4WD engages fine last I drove the truck.
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    Transmission Dump-shifts, VATS Light On (truck runs and drives).

    No ABS codes as you can see above in the pictures. But there is a wheel speed sensor code that pop up randomly that I have not seen before. I am think I might want to pull both batteries at the same time (again) and put them on the trickle charger for a few days and let the truck sit power free...
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    Transmission Dump-shifts, VATS Light On (truck runs and drives).

    This is very helpful actually. Thanks! Going to break this out after I fix the Glow Plug Circuit.
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    Transmission Dump-shifts, VATS Light On (truck runs and drives).

    This is more than likely two or more different problems, but I am mostly trying to think tank this. Professionals have been stumped including GM Dealer. I have some thoughts, but mostly need help and guidance. Outlined issues below. Pray for your sanity if I am not able to make this make sense...
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    New To The Forum

    Long time lurker. Been using this forum for assistance for a long time. Most of the problems I could solve, but this one is burning my brain. Looking forward to not being a lurker anymore and trying to contribute. I have lots of fabrication and geometry experience to offer, but electrical is...
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