Ive also scraped clean every ground point, cleaned the dielectric grease out of every connector with electronic cleaner and condensed air, and I've replaced the engine-to-frame ground strap with a 0-guage battery cable. A few unrelated fuses on my brand new fuse box in the engine bay read 0V with the ignition ON, but they have nothing to do with the TCM or ECM ignition circuits. All tested for voltage drop with digital multi meter. Newly spliced ground cable to engine bay fusebox. Brand new positive cable to engine bay fusebox. I've replaced damn-near everything on this rig with OEM parts: brand new TCM, brand new ECM, brand new EBCM, brand new shift range switch, brand new ignition switch, brand new dual AGM starter batteries, brand new engine bay fusebox, brand new 125amp megafuse. Brand new shift cable, nice and tight too. Vehicle does not register that it is in park, but starts and shifts perfectly. Parking indicator, manual 3rd, and manual 1st don't light up on the indicator display. If I go on the freeway and drive around long enough, it quietly pops back in to limp mode and locks me in to gears 2 & 3 while in drive. When limp mode goes away on its own, it shifts and drives absolutely perfectly. The van/truck (LMM Duramax V8 Chevy Express with HydraMatic 4L85,-E 4 speed trans) goes in and out of limp mode seemingly whenever it feels like it. P0705 (shift range sensor circuit A failure) and p0973 (shift solenoid A control circuit low voltage) with a touchy ABS module (brand new and programmed with a brand new connector) telling me there is a short to battery positive voltage on the rear wheel speed circuit. I'm posting this here because every other forum seems to be either dead or of no help whatsoever.
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