I just replaced the 1-2 , 2-3, shift solenoids on my 2003 trailblazer. Prior to changing these solenoids I had 1st and 2nd gear and reverse, but now I have nothing, won't go into gear at all,is th

SOURCE: 1st and 2nd shift error on code reader in trans

Shift error codes are enabled not only if the solonoids are faulty, does your scanner show you the solonoids switching? you could have a wiring fault. It could also be the pcm not allowing the solonoids to activate. These complicated systems are very difficult to diagnose for us profesionals with all the scanners and machines we have. Find a transmission shop in your area with a system to drive the vehicle bypassing the computor system, this will determine electrical or internal trans failure. But before you do anything check your conections from the transmission to the pcm. Also all the engine conectors and earth straps.

SOURCE: 4l60e going from 1st to 3rd and dont have overdrive any more

You most likely have a broken sunshell inside the transmission. They tend to go out when the transmission is shifted to drive when while still rolling in reverse.

SOURCE: i have a 1997 suburban

your transmission choul be open up and repair the inside

SOURCE: 2003 trailblazer does not shift into 4th gear ,

I don't think that you can trouble shoot your solenoid without a scanner. AAmco advertises on TV that they will check it for free. When you performed the service was the oil dark or smell kind of burnt? Was there excessive sediment or chunks in the bottom of the pan? If so you may have bigger problems other than a solenoid.

SOURCE: when driving 2003 trailblazer won't shift to 2nd

maybe trans. fluid is too low or has a leak, sometimes the tor