Checksum Error Question

**780ripper** · 03-11-2021

hi Rick, yes its an 8.1 / 4L80E that i installed, in a half ton, its awesome. i had a professional tuner set up the pcm with hp tuners so that i could run, from what i can see he mostly just removed the vats and my cash. I also bought a professionally assembled wiring harness that turned out to be missing connections which i also had to sort out bu myself. Im in the process of installing fuel pressure and air fuel ratio gauges so that i can watch what its doing. It runs hot so i want to change the fan settings for starters. I do not have the checksum plugin for that file, and i don't know how to use it yet, steep learning curve, i was hoping to make a clone of my pcm just in case i screw it up. i have a second pcm with OS 12216125 also set up to run this truck but it doesn't work properly

**B52Bombardier1** · 03-12-2021

What hardware are you using to do the reading of your PCM? I recommend the use of a Bluetooth "OBDLink MX+" device and either "PCM Hammer" as a Windows program of "LS Droid" as an Android program. Either of these with the MX hardware can make you a clone copy and I recommend the use of a bench harness.

Where did you get a copy of the BIN file you are working on?

Is it possible that your tuner person "tuner locked" the tune inside your PCM?

Rick

**780ripper** · 03-12-2021

hi Rick, i am using tuner pro v5 and pcm hammer 14 along with OBD link LX. I have read every pcm that i have available to me on the bench with this set up and it all worked. When i open the tune with hp tuners ( the program that was used to first tune my pcm) to view it it says that its not locked. The bin file is directly from what is on the pcm that is running my truck.

**B52Bombardier1** · 03-12-2021

This makes no sense to me. You say you are using a BIN file in the first post above but you open the tune with HP Tuners. But . . . HP Tuners does not presently have a capability to open a BIN file . . . only a *.HPT file. So I'm lost here.

Rick

**rickky bobby** · 03-13-2021

Originally Posted by B52Bombardier1

This makes no sense to me. You say you are using a BIN file in the first post above but you open the tune with HP Tuners. But . . . HP Tuners does not presently have a capability to open a BIN file . . . only a *.HPT file. So I'm lost here.

Rick

if you use HP Tuners 2.24.1172 you can look at bin files.

**LRT** · 03-12-2021

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**780ripper** · 03-12-2021

Hi LRT, thank you for the great info here,
you hit the nail on the head, im very new and still learning and overwhelmed with all the information available. I have spent countless hours to get this far and will probably spend countless hours more to learn and i dont expect to get it right over nite.

I am grateful that someone took the time to write this tuning software because its free but more because its interesting and requires educating and challenging yourself. I am also grateful that this forum exists and that there arre ppl like yourself and B52 to guide someone like me.

I started this project about 2 years ago and have gone from not knowing a thing about the efi system on my truck to doing a complete engine trans swap, redesigning the frame cooling system and wiring and now reading the pcms that i have.

To answer your questions:
yes i read the instructions in post 1 doesnt mention checksum use? only that is should be in the plugin folder.
I first built the test cable and read all of my pcms to determine which pcm has which os and data on it
i did download the checksum but did not use it correctly?
the xdf file is from the tunerpro website not from the post on here, i now downloaded the suggested files
i matched the xdf file to the pcm to the os
the bin file is directly from my vehicle as left by someone who tuned it previously with hp tuners, i opened both programs and compared the data in the tables between the hpt and tunerpro files
i have everything downloaded into one folder but i did not actually see instructions on how and where to install or use the checksum portion, maybe some guidance here please,

Hi rick, to explain better, i have a trial copy of hp tuners that i used to open the hpt file for my pcm. I did this to compare the data in the tables between hptuners and tuner pro, for my own self interest, and to verify things are not locked before doing tunerpro work. Sorry i didnt explain this very well,

**780ripper** · 03-13-2021

so i went back and did everything from the beginning as instructed in post 10. i adjusted the fan cut in and cut out temps and delays just like i wanted and saved the new file with a different name again but this time no checksum error message.does this mean that the bin file that i just saved is safe to write to the pcm?

**LRT** · 03-13-2021

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**780ripper** · 03-13-2021

thank you for checking, please see attached

**LRT** · 03-13-2021

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**Can** · 06-11-2021

Originally Posted by LRT

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Why is message 10 missing? A lot of people are having checksum errors and message 10 seems to have been what everyone is looking for. Can you please re-post message 10.

**B52Bombardier1** · 06-14-2021

If message 10 is unavailable and you need checksum errors repaired, try the "Universal Patcher" program. Great little tool that recently fixed a self-inflicted checksum error here.

Rick