Answered in another thread

 

P0315. You need to take it somewhere that has a computer capable of calibrating the crankshaft sensor.

But, I see from the other post that you put a VVT engine in to a car with a non-VVT ECM. So it may not be P0315 at all. I can't think of any that may come and go.

 

that code will come up when the timing chain get streached

 

You are thinking of P0335. p0315 means that there is no variation data stored in the computer.

I get them confused.