ESP Control Unit wierdness

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nicholas128
C Class
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Joined: Wed 12 Jun, 2013 1:44 am
Model you own: w204

ESP Control Unit wierdness

Post by nicholas128 » Tue 11 Dec, 2018 10:10 pm

Driving to work the other day in my 2010 C300 W204 and as I moved off down the street error messages started appearing in the instrument cluster. The following three error messages were appearing in the instrument cluster, cycling one after the other in a loop: 1. "Power Steering Malfunction, See Owner's Manual"... 2. "EBD, ABS, ESP inoperative, See Owner's Manual"... 3. "RunFlat indicator inoperative". I soon noticed that the power steering was not working. OK at speed, but low speed maneuvering was dangerous!
My independent Mercedes mechanic put it on the Star diagnostic system and said the ESP control unit was showing an internal fault. They sent the unit out for repair but apparently the place that repairs them said they couldn't find any fault with it. My indy mechanics refitted it and tested the car and all was normal. It has since been working fine (last 3 days).
Does anyone have experience of an intermittent fault with the ESP unit? Is it likely the ESP unit will fail intermittently until it eventually has a permanent fault, or is this possibly a bad electrical connection? Someone else suggested to me that this symptom can be caused by a bad wheel sensor, but since the Star diagnostics system showed only the ESP internal fault code, that seems unlikely to me. Any ideas?
Any assistance gratefully received.
Cheers,
Nicholas.

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Ivanerrol
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Re: ESP Control Unit wierdness

Post by Ivanerrol » Wed 12 Dec, 2018 8:30 am

Power steering sensor is a known W204 issue.

There is a diagnostic for this on my scanner - involves a driving test.
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nicholas128
C Class
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Joined: Wed 12 Jun, 2013 1:44 am
Model you own: w204

Re: ESP Control Unit wierdness

Post by nicholas128 » Fri 15 Feb, 2019 10:55 pm

This turned out to be the battery. Its remarkable what weirdness can result from a battery that is past its prime. I'm putting this post here so that anyone else with the same problem can know not to jump to the conclusion that there's a problem with the computer controlling the power steering.
Nicholas.

CraigB
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Re: ESP Control Unit wierdness

Post by CraigB » Sat 16 Feb, 2019 8:32 am

I've heard of this sort of thing before with batteries. What confuses me is that the diagnostics can't tell that there has been low battery power and record that. Same with our Peugeot but my indie mechanic seems to know all the tricks eg. it says this so that could actually mean this other thing. And he always load tests the battery first and checks alternator - very quick tests.
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John Green
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Re: ESP Control Unit wierdness

Post by John Green » Sat 16 Feb, 2019 12:14 pm

CraigB wrote:
Sat 16 Feb, 2019 8:32 am
I've heard of this sort of thing before with batteries. What confuses me is that the diagnostics can't tell that there has been low battery power and record that.
There is something in that story that doesn't make sense. First of all if you have low voltage it will log a fault and usually it will log an under voltage fault across most of the models in the car. There is a chance that you still have the fault if it is a dry older joint in the control unit. It will just take the right combination of temperature or some other variable to trigger it.

Hopefully I am wrong?
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http://mbspares.com.au - Supporting Australia's Mercedes-Benz Enthusiasts.

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