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post #21 of 25 (permalink) Old 03-12-2018, 08:42 PM
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When you get these codes in SDS, you can click on them and get diagnostic procedures. C26BB says to check the line between the SBC controller and the reservoir for a blockage. C26DE says to check the reservoir for leaks. If all that checks out, both codes indicate replacement of the SBC control module.

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post #22 of 25 (permalink) Old 03-12-2018, 09:44 PM Thread Starter
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How many cycles?

@kbob999
Have you checked how many cycles unit has and how much time it went through as I did in earlier post?
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post #23 of 25 (permalink) Old 03-13-2018, 05:33 AM
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Quote:
Originally Posted by rudeney View Post
When you get these codes in SDS, you can click on them and get diagnostic procedures. C26BB says to check the line between the SBC controller and the reservoir for a blockage. C26DE says to check the reservoir for leaks. If all that checks out, both codes indicate replacement of the SBC control module.
Thanks for the input.
I went thru those procedures and saw the steps. No idea how the line can be blocked, and there are no leaks.
Does this mean the internals have issues, like a bad control board or mechanical valves?

Knowing that MB does not like to fix things, but replace them, I’m hunting for the root cause.
Can I rule out the accumulator or brushes on the motor?

Brain flash...if the accumulator diaphragm fails...would it be perceived as a 'leak' in the reservoir (accumulator)?
I'm tempted to change the reservoir to see if that fixes it. Probably due at 15 years and 94K miles. Won't hurt anything, and I'm due for a brake fluid flush.

I did not check the number of actuations, but I’ll need to next chance I have. Will test drive first.

'11 E350 Bluetec P2 Sport 55K Mi.
'03 SL55 AMG Pano 95K Mi.

Last edited by kbob999; 03-13-2018 at 08:20 AM. Reason: Added thoughts...
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post #24 of 25 (permalink) Old 03-13-2018, 07:04 PM
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It does make sense that a broken diaphragm in the accumulator could register as a leak.

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post #25 of 25 (permalink) Old 03-19-2018, 06:16 PM
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Update - took the car for a test drive and cannot get the brake warning to return. I'll go for another longer drive and see if anything pops up. That's the good news.

I found threads where the SBC wiring harness comes loose, and there was a recall that provided a plate bracket (on the W211) to secure it.
My wiring connector at the SBC also has a broken plastic latch, and the top can come loose, so that may be the culprit.
I'm going to see if I can build a bracket to hold it more securely soon.

One thing I really like is the fact that I moved from 6400' elevation to about 200' elevation, and the increased power is amazing.
I was able to spin the tires by stomping on it at about 40 mph. Really fun test rides with my brother.

Will update everyone if I ever find an SBC issue down the road, and the number of actuations I find. Can't wait for spring!

'11 E350 Bluetec P2 Sport 55K Mi.
'03 SL55 AMG Pano 95K Mi.
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