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Turn car off for a bit, start her up again see if the message is still there. If not, drive it normally.
1. If the message comes up again, get the drivetrain software updated.
2. If that fails, it's the actuator (not expensive & you can change it yourself without jacking up the car).
3. If you get the message again after the actuator is replaced it's time for a new diff/rebuild but this is rare. As my AMG tech Allen said "90% of the time it's the actuator.
Hi all, having the diff error issue atm, can anyone confirm if this is the actuator shown in Jimmy's pic above? cheers
I recently had to get a new diff, software updates didn't fix it, actuator was tested and appeared to be working normally, so consensus between Merc dealer and a Merc specialist private workshop was diff's f*cked. Apparently work clutches/packs is fairly common in these, common enough that Merc Aus has racks of rebuilt diff on shelves ready to go. $10,000 aud later and i have a new/recon'd diff an no further error codes. Thankfully i had 3rd party extended warranty that covered it.
I recently had to get a new diff, software updates didn't fix it, actuator was tested and appeared to be working normally, so consensus between Merc dealer and a Merc specialist private workshop was diff's f*cked. Apparently work clutches/packs is fairly common in these, common enough that Merc Aus has racks of rebuilt diff on shelves ready to go. $10,000 aud later and i have a new/recon'd diff an no further error codes. Thankfully i had 3rd party extended warranty that covered it.
Revisiting this because I have spent $3000 US replacing wiring, Actuator, and Updating software, code came right back after 10 minute drive. I am at a loss. I do not want to put anymore into the car but I can't sell it in good conscious knowing it is there. Seems like replacing entire Diff is only option?
Hey mate. If a software update, and the actuator has been tested or replaced and you still get the error, yeah most probably its your diff on the way out. As i said its a common enough issue that Mercedes stocks rebuilt diffs for c63s's.
If you dont have warranty i'd consider going a wavetrac or similar aftermarket diff than another oem. will probably work out cheaper and will be way better/stronger.
Crazy things i have to read here
Lots of money burning ?
Update/new Actuator/ new diff ???
Sounds like nobody knows anything for sure, but we'll do something eventually.
Exists a techical description of this diff ?
I took a fast technical advice to the e-diff (C63s Coupe)
-> The differential works with multi-plate clutches and 2 pressure rings.
First ( its allways the same) use Xentry for diagnostic ( read errors & testing) .
If control devices ok, actuator ok the only what remains is the mechanical/ clutch issue in my mind.
This things can usually be repaired - no new 5.000$ diff needed.
Notice: All 50.000 km 31.000 mi / 3 Years new diff oil with MB spec 235.61 ( Castrol Transmax Limited Slip LL 75W- 140). ~ 1.2 Litre.
Last edited by C63s_Jack; Feb 12, 2026 at 03:14 PM.
SW Update for modul ?
If hardware is worn no update helps.
Thats not a computer or cellphone thats a pice of oily iron.
If you dont know the specific MB torque NM - i think possibly you can use the tightening torque table for screws (standard thread metric „M“ )
Thanks for the tip on the torque settings.
Agreed that if it's a mechanical failure of the diff itself then no software will help - however the error message for me appears in very specific circumstances. I have no reason to believe that the diff is faulty from a mechanical perspective as it's quite specific manouvers that trigger the error.
I am hoping to find out the exact software module version with the update if possible
Agreed that if it's a mechanical failure of the diff itself then no software will help - however the error message for me appears in very specific circumstances. I have no reason to believe that the diff is faulty from a mechanical perspective as it's quite specific manouvers that trigger the error.
I am hoping to find out the exact software module version with the update if possible
ediff it's the name of the module...but this will not help you at all if you do not start from the begining.
1 - Make a diagnose - diagnose is the process from where you have to check step by step as the program instruct ( Xentry is the name of the program ) starting from the error code, where the error code is not relevant for any parts exchange but is mandatory for step by step diag.
2 - ...depends of the last step of the diag.
Well you don't want to go to far while the rear diff is locked you may damage the transmission permanently I would have to see it in person to know more
My diff isn’t locked or broken - but I do suspect a software issue which multiple people report.
I have Xentry and can read all modules - so I want to check the version before going to MB
Xentry is more than a fault code reader or Variant reader.
You can click on the Fault Code and then from right bottom corner you can press "Test" or "Continue"...as you may have only a broken wire or some water ingress into the connector
Xentry is more than a fault code reader or Variant reader.
You can click on the Fault Code and then from right bottom corner you can press "Test" or "Continue"...as you may have only a broken wire or some water ingress into the connector
Thanks, do you know if Xentry can apply updates?
I assume the updates are pulled from MB’s server rather than bundled into Xentry
Do the step by step diagnosis, there is no sense to update something defective.
thanks, I will report back at the weekend with my findings.
And just after I posted I found that you do need legit Xentry to perform an update. Understandable really, and I’m not averse to the dealer updating it.
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