P0722 code

armydawg1300

New member
Feb 27, 2022
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Have a 2015 Chevrolet 2500HD, 180K, all stock. Started to town, CEL came on, and truck didn't want to shift gears. Scanner revealed P0700 and P0721. Replaced output speed sensor, and P0722 code now. Checked connector and seems good. Truck will barely pull itself under power now. Any suggestions?
 

Mike L.

Got Sheep?
Staff member
Vendor/Sponsor
Aug 12, 2006
15,686
231
63
Fullerton CA
Code reader will only give you a code. Scanner can tell you if thereis a signal. Then you can follow the wire from the TCM to transfer case.
 

Mike L.

Got Sheep?
Staff member
Vendor/Sponsor
Aug 12, 2006
15,686
231
63
Fullerton CA
Easiest one to use ( because you have a '15 and Tech 2 won't work ) is an Autel. I use one at the shop and it reads everything on the truck. Mine cost 1800 and it reads any vehichle made.
 

armydawg1300

New member
Feb 27, 2022
4
0
1
Hopefully I located problem. Harness to TCM somehow was being rubbed by serpentine belt.
 

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