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Hi
Unfortunately 2 weeks ago my B200 Turbo popped up the message "Transmission Fault". The car was still turning over but there was no power going to the weeks (drive or reverse). Pulled over waited a few minutes and restarted but still nothing but a "crunching" noise when I put it into drive or reverse. Recovered to my house.
I have a number of questions which I hope someone can help with?
- Difficult one but any ideas what it may be?
- Anyone else ever experienced this?
- Any ideas of cost to sort out?
I have spoken to several indis and they tell me that MB are the only people to sort it out as it is a CVT. Is this correct?
Spoke to MB and they told me it would cost £180 to diagnose! :-(
The car was bought for my wife to take the kids to school so not abused at all. It has FMBSH with 37000 miles and 06 plate. Is type of fault common at this age? Mileage? Do I have any leverage against MB for this?
Sorry for all the questions as I am a bit distraught. I lost my job so don't have much money at present and it is the only car we have so having to rely on friends and family for lifts :-(
Any advice will be really really appreciated!
Thanks
hi Wong
i have a A180cdi cvt, at 25k it played up, ratio got stuck joining the motorway I slowed down and increased speed again and it cleared. MB had it or a week and I think they just drove ir hard. I got them to change the transmission oil at the time, they did not want to do it. No problems since. Now at 53k i noticed at crawling speed in slow traffic that pick up from stationary is becoming a tiny bit jerky. I am going to get MB to change the oil again and comment on the behaviour as a precaution. A bit anxious about it and would chjange the car but wife and i both love it.
Hi everybody
Sorry but I was not getting notifications of post on this thread. Basically Mercedes were actually quite good. Cut a long story short. They gave me a hire car while they repaired the drive shaft.
They told me the cost was £750 for the drive shaft and £750 for the labour! But as a goodwill gesture they would only charge half price for the drive shaft and free labour. So all in it was a lot better than I thought but still ridiculous that the drive shaft failed after 37k.
Cheers
I have a 60 plated B180 CDI CVT and am going through the same thing, it has 36500 on the clock and has been well looked after. I bought it 2 yrs ago from a MB specialist NOT a dealer and last week I got the "transmission" fault come up on the dash. I took it back to Simon Light Mercedes in Ware and they said it could cost from £1400 for gear box electronics to £5000 for a gear box re build but they would not know until they dropped the box out. I have asked for a contribution towards the cost as I said that a major vehicle component should not give up after just 36500 miles. They said no and I should take it up with MB. Any advice? I now I will have to take it to MB first and get them to check but any advice will be most welcome. Thanks in advance
Question: There are 10 bolts holding the valve body on B200. In order to remove the valve body to access ECU, does the connector have to be disconnected from the housing?There is a common (but easily fixable) problem with the Transmission ECU (sometimes referred to as a TCU) from the autoboxes of W168, W169 and some B-Classes. Sadly MB dealerships are unaware/does not endorse repairs to these types of faults in the TCU, instead offering to replace with a brand new TCU that has to be factory ordered and coded to the car. The cost of the new unit plus the prohibitive MB labour rates typically make this an unaffordable repair - often costing what the car is worth. This creates a poor reputation for second hand W168/W169/W245 etc, but it creates a great opportunity for someone to pick one up as a real bargain to fix up.
Essentially the fault manifests in one or more of the connecting wires breaking loose/off from their connectors on the inside of the sealed TCU. This results in an intermittent bad connection(s). A typical symptom is a random transmission fault that can be cleared by switching off the engine.
When the car exhibit these symptoms, it is essential to get a STAR diagnosis to help determine the likelihood of a bad connection in the TCU or something else. Intermittent connection problems typically result in at least one fault code associated with more than one faulty solenoid valve together with an improbable signal fault of some sort. Here are the fault codes that were repeatedly recorded on my faulty TCU -
1634-Component Y3/9n1 is faulty...,
0793- RPM signal Y3/9n1 is not available...,
0722- RPM signal Y3/9b5 is not available...,
0896-Impermissible adjustment of the step down ratio...
According to ECU Testing, this fault is most likely to occur to a gearbox when it has covered or exceeded 80,000 miles!
As one can imagine, the probability of several components failing all at once is extremely small, although not impossible. This, coupled with the fact that the transmission appears to be capable of performing normally following a restart would further support the case of a bad connection.
Some members of another forum have reported that they have successfully completed DIY repairs on the bad connections on faulty TCU by cutting access "windows" through the TCU case and then re soldering the broken connections. I would not recommend anyone attempting this unless they are extremely skilled with cutting and soldering as damaging the TCU could result in an expensive replacement from MB. Furthermore there is a debate regarding the "best" solder to use for such repairs - the solder needing to be flexible due to the vibrations in the gearbox, yet tough enough to withstand the high temperature inside the gearbox.
Personally, I think sending the TCU off to be tested by ECU Testing is a safer approach since the unit will be tested before they will undertake any repairs. If the unit is faulty and repairable, the £230 is well spent plus you will get a lifetime warranty from ECU Testing. If the unit is not faulty you will get peace of mind for circa £50.
The good news with the MB auo gearboxes is that the electronics often shut down the box before any catastrophic mechanical fault develops. Sadly the clever electronics cannot save the gearbox from faults caused by wear and tear or lack of maintenance.
OK. The connector has been removed.Question: There are 10 bolts holding the valve body on B200. In order to remove the valve body to access ECU, does the connector have to be disconnected from the housing?
If yes, any good suggestions to remove the connector?
Mike
OK. The connector has been removed.
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