I had problems with my 2002 Cavalier.It would not shift out of first so I got it home and put the OBD2 on it.I got a shifting sylinoid a&b and also a P1680.I belive that is the PCM.I got the numbers off the PCM.If I go to the junkyard and grab a PCM from the same car do I have to get it flashed?Just worried bout the security on the car

Why would you think it's the pcm when it's telling you what the problem is? Shift solenoids go bad.

Because if the PCM is acting up then it could be sending a bad error to the solenoids causing it not to shift.The solenoids are controlled by the PCM

Ok replace the PCM and let us nkow what happens.

Uhm..... If you unplug the shift solenoids, doesn't the car get stuck in 3rd gear (or maybe 2nd)? If that's the case, and you unplug the solenoids, and it's still in first, that shows your problem.





i find it amusing that SHOoff has nothing better to do but follow me around & be an unhelpful dick in even cross-forum. - Jon Mick

Im going to replace the Pcm but wanted to know if I get the pcm dont I have to do something about the security?

I think you're throwing parts at a problem. I'd have it looked at by a transmission shop.





i find it amusing that SHOoff has nothing better to do but follow me around & be an unhelpful dick in even cross-forum. - Jon Mick

P1680 stands for reprogram or replace PCM... I'd get the dealer to reflash the PCM first, before replacing... If you need to replace, you need to get an automatic PCM matching your motor (If Eco, get an 02... if LD9 get 99-02, if 2200, get 99-02), and then do the security relearn procedure (key on for like 15 minutes or something)...

Edit: The dealer will reflash the PCM based on your vin... so anything crazy (like a motor swap), will impede this...

as for the shift solenoids... unplug them and see what gear you are in... you may have two separate problems here





Edited 3 time(s). Last edited Sunday, November 06, 2011 6:04 AM

Ok so I unplugged the batt for like 30 mins while working on the car.Hooked it back up and cranked the car ran it for 2 days with no problems and then all of a sudden everything comes back I think it is a PCM problem.Does anyone know where I can get a wiring harness for it also.Someone chopped couple wires up on it and I am a lil OCD on stuff like that.

Well finally got the car fixed.I got pissed off and started pulling my ECU and BCM and magically I seen a loose wire and put it back in the plug put everything back togther and magically everything is working as it should