check sum
Thread Starter
TECH Apprentice
Joined: Apr 2013
Posts: 367
Likes: 4
From: eastern nc
check sum i posted this in hp tuner ,no luck yet . i can write or switch tunes 0411 pcm .but will not allow to read starts reading then goes to failed checksum .i am on 4.0 version
TECH Enthusiast
Joined: Oct 2017
Posts: 567
Likes: 159
If I was to take a guess I'd say it's been flash with an OS from a 99/00 896 pcm. The 896 pcm for all purposes it's identical to a 0411 but there are a few things in the offset of the file structure that can cause issues when swapping OS's between pcm's. Upgrading an 896 pcm to a 411 OS usually works fine and even if it does cause issues they are in a section of the PCM that isn't a big deal. But when you flash a 411 pcm with an OS from the 896 it can get ugly and missing or incorrect check sums are one of the things that can happen. In a lot of cases the only way to correct the issue is to do a complete rewrite back to an OS that belong on the pcm or recalculate the checksums and preform a full flash to rewrite the values correctly.
