i guess this can go here.. im just looking for a quick answer on what that code is for? Its gonan be misfires? but it doesnt list a 315 code on my book?

I have the nelson tune also and I woulda thought those codes were edited?

any ideas?

 

P0315 - Crankshaft position (CKP) system variation values are not stored in the PCM memory
Gotta get the crank relearn done and you should be good to go

 

bud, where/how do I go about that?

I take the truck will be fine, just have a SES light untill i get that fixed?

 

If it's running OK you'll be fine...when the crank variation is waaay off it may run poorly (this happened to me once). But usually it'll just throw a code. The crank relearn needs to be done with a TechII or other capable scan tool. Certain tuning software can do it also (I think LS1Edit, EFILive, etc). Last time I needed it done I just went to the dealer and shelled out $40 bucks for them to do it and clear the code...it takes them about 5 minutes. They basically follow the prompts on the scan tool and bounce the engine off the rev limiter for a second until the PCM learns the crank angle variation. Just make sure that if you have it done at a dealership that you tell them not to reflash your PCM or you'll lose your custom tune...tell them that you just want the crank relearn done and the code cleared.

 

i think the guy welding my y pipe tomorrow has tech2 so hopefully I can get it done then