Intermittent ESP light

[edward obrien]

so first of all hello, and i so hope someone has an answer

So the issue i have is all over google but no real answers , let me explain what the situation is ,

First thing in the morning when i go to start the car , the ESP light comes on along with the runflat inoperative message read owners handbook!! then i turn the key off and on a couple of times and the light disappears and the car will start,

not sure if this is related but the negative battery cable has a module on it its some sort of regulator and that has had some sort of corrosion all over it to the point it dissolved the plug that goers into the module ,

i purchased a launch crp 479 obd tool which has not picked up any faults at all and no engine management lights come on ,

these are the things i have changed or checked so far

• Brake light switch
• new rear disc and pads,
• new front pads
• negative cable and module that is attached to the cable
• new battery
• Alternator power is between 13-14.65 volts and does not drop with all the power being used in the car.

guys i have had the car in a MB franchise work shop to fix the aircon and no faults were picked up then, i also had the car recalled for a software update and no faults were picked up then,

eddy

 

[steve gooding]

Hi eddy

Have you tried the wheel speed sensor? (Abs wheel sensor)
These quite often fail and do give the exact warnings you describe. I had one go on mine. You will need to get the abs codes read to find out which one is faulty tho.. an easy diy job to change

Hope that helps..
Steve


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[onefortheroad]

as above, especially following any brake work . particles can stick to the abs sensor rings .

 

[edward obrien]

hi, so the tester ''CRP479 Launch'' i bought checks abs and a whole raft of other things, but its not showing up as a fault code, and the strange thing is as well, it only happens every so often i cant nail it down, this issue was happening before i got the brakes done as well , what i dont want to do is take it to a main dealer and they swap out lots of bits at a massive cost (pot luck ) i did get a code pop up on the reader == 102f00 with this wording The signal of the circuit (0) is implausible,,,, god only knows what that means , i can find anything on google , oh also this model does not have the sensors in the tyres its part of the abs system,

and thank you so much for coming back to me, this has driven me mad for months ,

 

[onefortheroad]

The sensors that are in the tyres are purely for measuring tyre pressures. A flat tyre turns slower than an inflated tyre. That's when the abs uses the speed sensors. There are sensors at each hub with the pick up ring also being the grease seal for the 2 front wheel bearings. I'd be suprised not to see any fault codes logged tbh. Have you checked the ride height sensors are working ok and not seized or detached??
If fitted !!

 

[steve gooding]

The sensors that are in the tyres are purely for measuring tyre pressures. A flat tyre turns slower than an inflated tyre. That's when the abs uses the speed sensors. There are sensors at each hub with the pick up ring also being the grease seal for the 2 front wheel bearings. I'd be suprised not to see any fault codes logged tbh. Have you checked the ride height sensors are working ok and not seized or detached??
If fitted !!

Learnt something there. I thought the run flat sensed an imbalance in pressure. Never knew it counts wheel revolutions and ‘assumes’ a tyre is soft. So if I drove in a circle for a period of time, would the check tyres warning come up on the dash?


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[onefortheroad]

Learnt something there. I thought the run flat sensed an imbalance in pressure. Never knew it counts wheel revolutions and ‘assumes’ a tyre is soft. So if I drove in a circle for a period of time, would the check tyres warning come up on the dash?


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Normal rubber valves use the abs wheel speed sensors. I'm not 100 % on the tpms system tbh. His car being a 2010 most likely wont have tpms.

 

[steve gooding]

Normal rubber valves use the abs wheel speed sensors. I'm not 100 % on the tpms system tbh. His car being a 2010 most likely wont have tpms.

Mine is 2012 and doesn’t have tpms, so probably right..
It does sound like a speed sensor at fault on Eddys car, but strange it hasn’t logged any codes.


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[onefortheroad]

First-generation iTPMS systems are based on the principle that under-inflated tires have a slightly smaller diameter (and hence higher angular velocity) than a correctly inflated one. These differences are measurable through the wheel speed sensors of ABS/ESC systems

 

[edward obrien]

Hi, so I do not have sensors in the tyres , this type of TPMS system came out in late 2012 so I hear, so my bets are on the ABS sensors, but it's strange it sees a fault without the car moving but does not register and faults on the tester, and still puzzled by the corrosion that has built up on the negative battery terminal, I am going to have to bite the bullet and take it to MB, it's such a stupid fault, the runs perfect it's only done 70k, should of stuck with the c220, that car did not mis a beat, that's why I went for another one so disappointed with the E class,

 

[onefortheroad]

https://forums.mercedesclub.org.uk/index.php?threads/run-flat-indicator-inoperative.170152/

 

[onefortheroad]

Also ...... https://forums.mercedesclub.org.uk/...ative-and-run-flat-fault.157430/#post-1462438

 

[edward obrien]

hi gave it a look, the steering is spot on and the tester i have has a reset button for sas, but when i tried to use it the tester said my vehicle does not use this tool/set up,

but once again thank you for taking the time to send me ideas

 

[edward obrien]

So looking at that link, it's best get it to a Merc dealer with star system, the sensors are not too bad price wise, so hopefully they can diagnose it without a fault code,

 

[onefortheroad]

So looking at that link, it's best get it to a Merc dealer with star system, the sensors are not too bad price wise, so hopefully they can diagnose it without a fault code,

Or an indie with star .

 

[edward obrien]

Yep , I'll give it a go, thank you,

 

[Doritu212]

Yep , I'll give it a go, thank you,

Hello Edward, my E350 cdi 2009 has the 100% exact Problem. Could you please please tell me the solution??? Thank you soooo much…

 

[ajlsl600]

The sensors that are in the tyres are purely for measuring tyre pressures. A flat tyre turns slower than an inflated tyre. That's when the abs uses the speed sensors. There are sensors at each hub with the pick up ring also being the grease seal for the 2 front wheel bearings. I'd be suprised not to see any fault codes logged tbh. Have you checked the ride height sensors are working ok and not seized or detached??
If fitted !!

I have had this. And then go away for weeks only to come back again I have even driven down the road looking good live data for all sensors.(same speed indications)

Yet one would come up faulty again later the last time the front sensor would cause the car to jerk like it did not know when to shift or it was applying the brake no idea which to be honest abs and sbc lights wud come on and jerking stopped until next time.
I now have more confidence in a 9k 1972 /2009 built kit classic than in a 50k 2013 mb.