[6ixSpd]

If you have the dreaded 2FA4 error code pop up on your MSV70 DME following a flash to the 330i software (ie. Bimmerlabs 330i conversion tune) on your 325/328i, I believe I have found a fix.

What is this error?

2FA4 results from a powerclass mismatch between the DME and CAS software. This throws the car into a very low-power limp mode, where it feels like it barely has 50hp.

What is the fix?

You need BMW Standard Tools and NCS Expert. Do a read (Codierdaten_Lessen) of your 6BMOT (this is the DME's module in NCS) and CAS modules.

Look for the following:

• CAS: CLASS_PWR = klasse_1 or klasse_2
• 6BMOT: OLULCODIERUNG = wert_01 or wert_02

Both MUST match in order to prevent this code; ie. klasse_2 & wert_02, or klasse_1 and wert_01.

Change the 6BMOT's power class level to match that of the one you found in the CAS. Flash this modified .MAN file via SG_Codieren to the 6BMOT module and you're done.

This successfully resolved the issue.

Hope this helps anyone out there having this problem as there is barely any info on this and it leads to many headaches

[Terraphantm]

I'm surprised you were able to change your 6BMOT, since that's locked out after 10 hours. I do have a modified program that allows it to be changed, but as far as I'm aware that wasn't being distributed on bimmerlabs.

Also there is a 3rd variable - what the powerclass byte is set to inside the tune. All 3 have to match.

[6ixSpd]

Originally Posted by Terraphantm

I'm surprised you were able to change your 6BMOT, since that's locked out after 10 hours. I do have a modified program that allows it to be changed, but as far as I'm aware that wasn't being distributed on bimmerlabs.

Also there is a 3rd variable - what the powerclass byte is set to inside the tune. All 3 have to match.

That'd what I thought too, but I was able to modify it on this '07 328 and even on my '12 135i. I guess I got lucky the 330i flash was on the same powerclass as the CAS and the modified 6BMOT.

Good point about the tune's internal power class. I'm assuming that would need binary editing. Would you happen to know/share what address that's located at for future individuals encountering this in the future?

[Terraphantm]

Originally Posted by 6ixSpd

That'd what I thought too, but I was able to modify it on this '07 328 and even on my '12 135i. I guess I got lucky the 3308 flash was on the same powerclass as the CAS and the modified 6BMOT.

Good point about the tune's internal power class. I'm assuming that would need binary editing. Would you happen to know/share what address that's located at for future individuals encountering this in the future?

Have you ever read it back after changing it?

Internal power class address varies from program to program. I don't know the addresses off hand

[6ixSpd]

Originally Posted by Terraphantm

Have you ever read it back after changing it?

Internal power class address varies from program to program. I don't know the addresses off hand

Yup, and the changes are found in the new trace file.

Fair enough. I wonder when/if the days will come for these ECU binaries to have address guides like you helped build for the MSS54 world. They've been amazingly helpful when I helped a friend tune out various DTCs and other parameters for his E46 M3 track car.

[yupetc]

Is this error also somewhat congruent to the error we get "2D59" or "2D58" whenever we get the AA Flash where the power output has increased and the car throws a code for torque output value exceeds target torque or something of that sort? Because it also puts the car in limp mode, though the flash actually yields a lot more power and a great fun to drive.

If it's not, then do any of you guru's know how to address it by coding through the options in CAS or DME to disable that function?

[BZ92EEE]

Originally Posted by Terraphantm

I'm surprised you were able to change your 6BMOT, since that's locked out after 10 hours. I do have a modified program that allows it to be changed, but as far as I'm aware that wasn't being distributed on bimmerlabs.

Also there is a 3rd variable - what the powerclass byte is set to inside the tune. All 3 have to match.

Can you tell me what is the 3rd variable to check ? i have the same issue

thx

[aphael]

Originally Posted by BZ92EEE

Can you tell me what is the 3rd variable to check ? i have the same issue

thx

I had the same issue, I just reset the 6bmot and reflashed the rsa delete + tune and it worked fine. Didn't mess with any powerclasses

[hillscanpatrick@yahoo.com]

Originally Posted by aphael

I had the same issue, I just reset the 6bmot and reflashed the rsa delete + tune and it worked fine. Didn't mess with any powerclasses

how did you reset the dme? what tool?

[restricted]

i really appreciate you making this post. i was so worried that i messed my car up with the tune. 3 hours later of research i found this post and literally fixed the problem in 2 minutes. thanks again!