[Lucy Rahmlow]

i have a 2005 cobalt will crank but will not start.. tech 2 code u2100 failure.. no other codes.. how do I get the tech 2 to link the pcm to bcm again? reprogram/communicate.. or should I just get a junk pair with my pcm number?

 

[Lucy Rahmlow]

I got another pcm.. it still reading code u2100.. maybe a bad relay or fuse?

 

[Lucy Rahmlow]

This pcm is reading the right vin number!