02 chevy express 1500 6 cylinder 4.3 Codes P1860 P0740 P0785

Question

I took it to Transmission repair shop they replaced the TCC selonoid
PWM selonoid and harness .still getting 2 codes 1- p1860 . 2-NA
sometimes it showes All three codes .I replaced the ignition switch
to make sure .still the same .Anybody out there can help me ?.Thanks

Answer 1

P1860 TCC PMW solenoid circuit electrical

P0740 TCC solenoid open or short circuit

P0785 3-2 shift solenoid

What you have is a short somewhere , the TCC and the 3-2 shift solenoid are fused protected, let say you have a 3-2 solenoid and it short out, it would take out TRANS Fuse 20 located in the engine fuse/relay box, as a result  you set a TCC code,  no TCC and the 3-2 solenoid, The short has to be traced, in some case does the the short ends up being in the instrument panel.