ok I was doing a timing chain and balance chain on an 06 hhr 2.4l. ( Iknow not a cobalt not joining another forum).

Getting codes p0651 p0107 p02101. tried clearing comes right back. Had battery test was all good. everything is plugged in torqued to spec. getting 12v to the sensors. Some have 4.8v. I think the ecm is working. But the real strange thing is the Odometer is now reading 999979 miles . My brorher inlaw said check and see if I broke a ground somewhere, haven't checked yet been working.

I wanted to see your input if im missing something.

 

Bump

 

Checked grounds none broken or loose. Bought a book for ecm/engine wire diagrams. Had none in it. Just for accessories.

Does anyone have a wire diagram of the engine and ecm 06 hhr. So i can trace this issue