I have a 2006 Aveo and the code PO315 shows up and the CEL is on all the time. I took it in to have the crank relearn done and it will the light will go off only to come back on as soon as the key is put in the ignition. He tried putting on the original crank sensor (which was replaced along with an ignition coil and manifold gasket) and both sensors gave him the exact same reading.

He unhooked the battery and again, the code would go off but come back on again.
I do not know what to ask them to look for, any advice would be greatly appreciated. Thank you