Hey Folks, I've got a 4160 with major problems, hope someone can help. It's in a 96 Suburban 4wd with a 350, all stock. I've got reverse and nothing unless I remove the fuse, then I've got reverse and third. Fluid level is good, filter was recently changed and system was flushed, I've checked the wiring harness visually and with an ohmeter and can't find anything wrong. It throws the following codes p07539(sol a),p0758(sol b),p1860(tcc),p1864(tcc), and p1886(shift timing sol), It seems odd to me that all those solenoids would go bad at the same time, not impossible but odd. I really think I'm missing something with the wiring, any ideas? This truck has 340,000 miles on it, the tranny will need rebuilt soon, but I really want to fix this problem before I pull it. Thanks in advance for your help.

 

I had a the same problem a couple weeks ago, my truck was tossing tranny codes, the coverter would not lock up and all I had was R, 2 and 3. It ended up being the ignition switch.

 

Often times a flush will break lose gunk inside and block passage ways..

 

Check the connector on both sides, and make sure the pins/sockets are snug in-place. All those codes at once would make me lean towards power to trans.

 

I would pull the pan to look for pinched wires. It seems to me that something might have happened when the trans was serviced. Just a thought.