4l80e 1995 c2500 2wd

[Stoney]

Always thought if you disconnected that it would screw the computer up.

 

[THEFERMANATOR]

Always thought if you disconnected that it would screw the computer up.

It goes to limp mode. It is not a diagnostic aid. Unplugging the vssb does nothing but put it into limp mode shifting based off of strictly the input speed sensor.

 

[Stoney]

I have the update. vss buffer was bad. i unplugged it and it seems to be fine now just no speedo. thanks for the help

Therm, this post is why I thought you could just unplug...is the buffer a different sensors?? If so where is it

 

[THEFERMANATOR]

Therm, this post is why I thought you could just unplug...is the buffer a different sensors?? If so where is it

The vssb is the vehicle speed sensor buffer, it converts the low AC voltage signal from the speed sensor into signals for the speedometer, abs, and ecm.

 

[ak diesel driver]

It's located behind the glove box right next to the PCM

 

[Stoney]

Ok so that's what he disconnected that made the truck run good... Just no speedometer... wouldn't that be a possibility of a electrical short ?..just trying to learn