2003 chevrolet hd 2500 6.6 duramax allison

[X1I8823]

got some sensor codes and changed them, speed sensors. Truck will shift at low RPM but will stick in third gear if mashed. Getting code P0720. ABS light comes on. Would take to a shop but dont really want to pay for someone to learn. Any suggestions?:nail:

 

[oldestof11]

Putting it in the right forum?

 

[TravisG]

I'm going to put this here for ya.

2003 is an LB7 right?

 

[02Dmaxdually]

correct

 

[02Dmaxdually]

Is it 4WD? If so check the speed sensor on the top of the transfer, I had the same problem when I removed mine to replace the o-ring and forgot to plug it in.

 

[TravisG]

correct

Sweet. Thanks. I know that somewhere there was a mid year engine change, but I think that was 2004 right? Something about injectors under the valve cover and not under the valve cover.