The release notes for RC8 say "Fixed CMB checksum issue caused by "box tuners" not returning controllers to stock (please refer to new pdf guide for more info)."
You need to install RC8 then follow the PDF guide to correcting this issue.
Checksum fix does not work on my truck with the new RC8.
I have followed everything that in the PDF on how to resulve checksum error p0602 no luck on the fix. Is there something that is missing in the PDF file
Last edited by 06redram; January 7th, 2012 at 07:30 PM.