Hi everyone I am new to this forum and would appreciate any assistance in trying to fix my tahoe. These codes all came on at the same time the other day while driving. I cleared the codes and started it back up and 740 785 and 1860 came back right away. I do have battery voltage on both sides of the #20 fuse with the key on. Not sure what to do next.
1999 Tahoe with codes 740 753 758 785 1860
- Thread starter ddumbo
- Start date
Hey on the output of fuse 20 it's a pink wire that runs to the transmission and powers the tcc and shift solenoids. I'd unplug that connector at the trans and check for voltage on the pink wire (should have power even with key off) .If you have power on 20 but nothing at the trans pink wire there is probably an open in between the fuse box and the trans.
Thanks for responding mayo3lt. I am not sure where to find that connector at the transmission, what does it look like?
