ABS/ESP pre-safe inoperative intermittent fault W204 C63

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OK - wierdly i removed the earth as mentioned, cleaned and re-fitted. when i started the car there were no abs faults on dash but power steering was not working?? co-incidence? i now seem to always have no power steering but the abs fault will flag up later on as usual.

does this mean anything?? o_O
 
I had this error on a C63 I previously owned, and it needed the ABS pump replaced, the Mercedes specialist I used said this to me straight away after plugging the car into STAR
 
I had my C class w204 showing similar faults last year, I didn't lose my power steering but the steering just didn't feel right. Turned out to be the steering angle sensor. ABS faults on dash. Cruise control didn't work, think there were a couple of other things too, can't remember now. Good luck with it.
 
UPDATE:

had the car diagnosed by an auto electrician yesterday and concluded that the ABS module is faulty. will get it sent for repair and report back.
 
so, ive had even worse news than a big bill on this. apparently the ECU repair company cannot find a fault with the unit..

the said to "refit it and hope for the best" lol

will let you know how that goes...o_O
 
update: the module is back, fitted, and briefly allowed us to read the codes below. decision was to go ahead and re-bleed the system, then a bleed nipple sheared on the front caliper...

awaiting a new one and will report back. we started the car and for 10 minutes no warnings, just sat there and then the usual warning popped back up again :wallbash:

the 5001 fault is still there and all i have read points to the module being at fault. confused.com

IMG-20230802-WA0004.jpg
 
another interesting point on this:

i was talking with a friend and he noticed my brake lights flashing on and off when i overtook him the other day - ive just read about the brake switch causing issues and 5001 codes but seems to good to be true??

:confused:
 
another interesting point on this:

i was talking with a friend and he noticed my brake lights flashing on and off when i overtook him the other day - ive just read about the brake switch causing issues and 5001 codes but seems to good to be true??

:confused:
It's worth a try for £12 . With mine the lights were just staying on , I bought and changed the switch , no change.
 
A friend of mine is having the exact same issue as you, changed the battery, wheel speed sensors and also cleaned up some of the canbus connectors. Might try a new ABS/ESP module now.

Have you managed to sort your issue yet?
 
A friend of mine is having the exact same issue as you, changed the battery, wheel speed sensors and also cleaned up some of the canbus connectors. Might try a new ABS/ESP module now.

Have you managed to sort your issue yet?

update:

NOPE. - cars back with me now after 5 weeks. module apparently OK but don't believe it tbf.. tried new brake light switch and that also did nothing. at a loss now.. fault was all clear for a couple of minutes, they test drove it, got back to the garage and then everything lit up again. now its back on constantly again.

anyone recommend a specialist close to the oxfordshire area??
 
also:

i now also have this message, i have not seen "EBV and diagnostic/rig test before" - any ideas? interestingly this morning i had no power steering or abs but throttle and gear shift (downshift blips etc) were not impacted until after 10 mins or so the full "ABS/ESP pre-safe inoperative" came back..

20230902_141557.jpg#
 
also:

i now also have this message, i have not seen "EBV and diagnostic/rig test before" - any ideas? interestingly this morning i had no power steering or abs but throttle and gear shift (downshift blips etc) were not impacted until after 10 mins or so the full "ABS/ESP pre-safe inoperative" came back..

View attachment 146194#

Suggest you purchase a used abs module and have it coded. Your soldering could of altered the current flow , very sensitive items ,seeing as it's a safety critical device.
 
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The recurring fault codes on your front sensors could indicate an intermittent issue. It's advisable to have the sensors and their connections inspected for possible wiring or sensor problems. The symptoms you described suggest it might be sensitive to temperature changes or vibrations.

Hi everyone,

new to the forum and wondering if anyone can help with a strange intermittent fault i have.

during every journey i get a warning on the dash " ABS/ESP and pre-safe inoperative" sometimes it will disable the power steering and sometimes not. i scanned the car and found a rear left abs sensor fault - this was changed but the fault is still occurring without this error code coming back.

i now get a few different codes and from what i have been told i now have an issue on one or both of the front sensors? sometimes the fault appears when 1st turning the car on, other times after driving for a few miles. it also ALWAYS faults when turning the car back on after a short drive, i.e at a petrol station. even though it got there without fault..

View attachment 142526

my plan was to replace a front abs sensor at a time. initially i thought it was the module and have since opened that up and soldered all the connections but this didnt change anything.

help appreciated!

thanks

Adam
The recurring fault codes on your front sensors could indicate an intermittent issue. It's advisable to have the sensors and their connections inspected for possible wiring or sensor problems. The symptoms you described suggest it might be sensitive to temperature changes or vibrations.
 
Suggest you purchase a used abs module and have it coded. Your soldering could of altered the current flow , very sensitive items ,seeing as it's a safety critical device.
yeah i think im coming up to this action now. the hardest thing is finding one and also the fact ive sent mine away and they have said its fine. slightly reluctant to throw hundreds of £ at it due to that..
 
The recurring fault codes on your front sensors could indicate an intermittent issue. It's advisable to have the sensors and their connections inspected for possible wiring or sensor problems. The symptoms you described suggest it might be sensitive to temperature changes or vibrations.


The recurring fault codes on your front sensors could indicate an intermittent issue. It's advisable to have the sensors and their connections inspected for possible wiring or sensor problems. The symptoms you described suggest it might be sensitive to temperature changes or vibrations.
good point - the only argumanet against this is why would it be present from the start - i.e, if it was a wheel speed sensor surely, A, it would require movement to realise its faulty and B, surely a scan would indicate a faulty wheel speed sensor??
 
good point - the only argumanet against this is why would it be present from the start - i.e, if it was a wheel speed sensor surely, A, it would require movement to realise its faulty and B, surely a scan would indicate a faulty wheel speed sensor??

Basically the first thing in the canbus daisy chain that throws a wobbler passes the parcel to each and every component in that chain. So you need to find the source. A scanner like icarsoft will simply point to anything and everything.

The timing from point of origin to the next canbus point is something like 4 milliseconds, if there's a stutter and a wait time develops like 4 seconds , that's when you get those messages.
One thing to try as a last resort is going into the steering wheel options and turn off all the pre safe devices , this may just eliminate them from the equation for now ??
 
Basically the first thing in the canbus daisy chain that throws a wobbler passes the parcel to each and every component in that chain. So you need to find the source. A scanner like icarsoft will simply point to anything and everything.

The timing from point of origin to the next canbus point is something like 4 milliseconds, if there's a stutter and a wait time develops like 4 seconds , that's when you get those messages.
One thing to try as a last resort is going into the steering wheel options and turn off all the pre safe devices , this may just eliminate them from the equation for now ??
didnt know you could do that - you mean from the steering wheel or a scanner?
 

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