I ordered and installed a custom PCM tune from BlackBear Performance a few weeks back and bought a new PCM at the time as well.

I did need to do a security relearn once the new PCM was installed, but I've still not noticed any codes (and I have scanned the system with my OBDII scanner).

My question is this: even though I've received no code, should I still get a crank relearn (CASE relearn) done since I've installed a different PCM that was original installed?

I have run several different tunes & I also have two pcm's and I never did a re-learn. I don't know what dictates whether you need a relearn or not but I never had any problems.

I also did not do a "re-learn" after I installed my Black Bear PCM. I had no issues.

i think it will kinda relearn itself eventually?