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View Full Version : BMW E70 cyclic authentication error after tune



nickolasd
9th March, 2018, 10:30 PM
I'm trying to solve this problem with E70 with edc17cp09 ecu

after tune getting checksum errors:
41FD and 41ED - DDE control module internal(cyclic authentication)
checksum corrected by Ktag original during write, same problem
than manually corrected checksum with Winols with help of member here, same problem.

ori, mod and mod with checksum files attached.

dominik.m
9th March, 2018, 10:39 PM
Hi.
Subject bmw with these DTC was many time on this forum.

nickolasd
11th March, 2018, 05:49 PM
well may be i dont know how to search but when use key word "cyclic authentication" i get only 2 of my own posts from entire forum. when i search by dtc code 41fd or 41ed i get same results. and when i use "control module internal" i get million hits for any other make on model but not for bmw. so even if it was already discussed many times on forum it makes it quite difficult to find.

Ignasvw
11th March, 2018, 05:52 PM
Maybe just delete dtc and problem solved?

nickolasd
11th March, 2018, 06:13 PM
yes may be, but problem somewhere in a checksum and I'm looking for solution how to fix that checksum or maybe dump is bad

aem
11th March, 2018, 07:00 PM
you will not solve this problem without update ecu
so better delete error and goodbye......it will work forever