I had a dyno and tune done, its been about three months and my check engine light came on. If I do the reset by disconecting the negitive battery cable, will I lose my tune. Thanks Troy

 

Once the PCM is programed it stays. However when you disconnect the battery it has to go thru the whole learning thing again, fuel trims and all that, could take a couple of weeks. Much better to clear it with a scanner. And of course fix the problem.

 

You will not lose your tune. Have it scanned and let us know what the codes were. If you clear the codes they will most likely come back unless you fix the problem.

Bill