Auto transmission problem

mechanic945

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I have a C203 CDI but change cars all the time.
Hi guys. Maybe you can share your views with me. Customer brought a C250 Turbo Auto R reg at 119 000 miles. 202 128 chassis. Engine is fine without any fault codes and runs perfect. But automatic Transmission doesn't change gears. I have done Diagnostic check on Drive modules and retrived two fault codes on Automatic transmission (using X431) The codes were, Code 001; 017 no fault text specified at present; Resistance too high, CODE 002; 113; No fault text specified at present. Resistance too low.

After clearing the codes car drove fine changing gears perfectly for about hal an hour then stuck to first gear again. And customer call me back asking what can be done at next step.

I suggested the next step would be changing the gear oil also filter. He asked me to do the job. Bought new filter and oil from mercedes, remove the oil pan and oil filter, checked it, Oil had a burning smell in it also was dark, didn't see any metal particles or grinding bits in the oil pan. I thought the colour and smell is acceptable because the oil was never changed before. ( remembering the mileage of 119.000 miles.)

I didn't have the Dipstick tool so I measured the oil removed from the box, and added about 250ml more which come to 3.5 litres total. Auto data indicated that empty Auto box with new converter takes about 5 litres. So it was about right amount. Done diagnostics and same codes come back again. Clear them and took the car for a test drive on M25 and clocked about 50 miles running excellent, gear changes, and kick down functioing perfectly. Come back to garage and had coffe and a little chat with the client. ( about 2 hours car rest) and customer took the car and gone. Had a call almost immediately saying that it doesn't change gears again. So back to square one again.

Tomorrow I am planning to spent some time and check the battery, terminals, charging, and also check the terminals (connection Plug) of the Auto Box module.

I don't think it is mechanical condition of the box. Because when you put in D or any gears to move it is very responsive without any clank or knock or noise. Also gear changes are so smooth almost un noticable.

Has any one experinced similar problem? Thank you
 
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kebo57

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Hi sound like it could be the speed sensors in the auto box when you’re turning the ignition of you inadvertently clearing the limp mode but I could be wrong
First thing is that you need to do is determine what type of box you are dealing with & check the oil level (its fairly critical) if it's a 722.6 box then there is a link to the dimensions of the dip stick http://forums.mercedesclub.org.uk/showthread.php?t=33465&highlight=auto+box+dip+stick
So if you can knock one up then you save £20.00 approx

Kevin
 

television

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This car could have either box fitted,,could be the 722.6 or the 722.4 we do need to know what one it has, and welcome to the forum
 
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mechanic945

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I have a C203 CDI but change cars all the time.
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it has taken me some time but I fixed the box. Thanks for the comments and suggestions.
 

Alex Crow

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c`mon, give us a clue. you changed the `electrics kit` as mb call it??
 

James s

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Is there any more answers for this thread? Did anyone get a reply?
Please I'm desperate! Not had a car for two months due to this exact problem. Many thanks! :-o
 

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James if the engine power is down,,like the maf being faulty if you have one, this will give the same problems as the box will not know what gear to go into and it will lock up and not change at all
 

James s

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Thanks for that! I'll write here again if it works out to be maf.
 

kole301

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Defective engine mounts might also provoque the limp mode...
 

James s

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Vehicle speed sensor in the box apparently. A specialist quoted £400+VAT for the job and the part with new oil/filter and time. Got a mechanic friend on it though so hoping not much more than half that £.
 

James s

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OK then, the error codes are: 009, and 013. Both are VSS-Vehicle Speed Sensor.

New electroplate for sure.

Any idea where I can get a new one for the smallest moneys possible?!?
 

James s

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Sorry to keep adding to this thread but I thought this important:
Got B6G ELECTRICS KIT for gearbox, was £165.68 including VAT from MB dealer parts counter, part number is MA140 270 11 61

To reiterate that's For my 97' C180 5 speed auto.
 

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Sorry to keep adding to this thread but I thought this important:
Got B6G ELECTRICS KIT for gearbox, was £165.68 including VAT from MB dealer parts counter, part number is MA140 270 11 61

To reiterate that's For my 97' C180 5 speed auto.

You just need to fit it now, and that should be straight forward
 

James s

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Part all in working great. Only problem is it revs itself a bit sometimes when changing up?
 

dieselman

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Fluid level a bit low, so allowing the torque converter to flare.
 

James s

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Sounds good to me. I've got a metre of 3mm welding wire to test the level. How deep should the fluid be?
 

television

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5.6cm up the wire when box at 80c and in P running
 


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