fault codes p0753 p0743 p0763 p0758 - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 03-19-2011, 04:03 PM Thread Starter
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Vehicle: 1997 Mercedes C 280 Sport
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fault codes p0753 p0743 p0763 p0758

I have a 97 c280 sport and had a leak at the pilot bushing. I replaced the pilot bushing as well as the fluids from the pan and torque convertor. Also replaced the filter and gasket. I used the MB transmission fluid at $14 a pop. During the job I unplugged the 13 pin connector before emptying the torque convertor. I didn't have a 27mm socket so I was trying to get lucky and have the torque conv. drain plug come to the opening (which didnt work). The next day I got the socket and removed the plug and completed the job. When I went to start it I noticed the engine check light came on. Got my odbcII scanner and wrote down the faults then erased them. The car only works in second or reverse. When shifting it jolts quite hard. I di take a voltage meter down to the pilot bushing plug and some pins had 12 volt or greater. I am very confused and don't know what else to do. Please advise.
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post #2 of 4 (permalink) Old 03-19-2011, 07:27 PM
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If the leak was bad enough it may have forced fluid up the harness into the TCM, so check that. Usually it can just be cleaned up (electrical contact spray, unplug the harness below again and spray some cleaner down the harness) and will work fine.

Re: the codes, if you check again they will still be there; regular OBD-II can't clear them (they're stored in the TCM) and until they are cleared it won't work right. You have to have a snap on, sds or carsoft connection to the 38 pin diag conector.

Once you clear them if they come back you may have to replace the conductor plate (it's what the harness plugs into via the pilot bushing you replaced.) In fact if the codes weren't there before and you weren't careful witht the pilot bushing you may have damaged the pins on the conductor plate.

Lots of information in the 722.6xx FAQ thread in the W210 stickies, same transmission as you have.

Good luck.

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Last edited by Check Codes; 03-19-2011 at 07:31 PM.
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post #3 of 4 (permalink) Old 03-20-2011, 10:59 AM Thread Starter
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Transmission not shifting

I did clean the connector with elecronic contact cleaner. The fluid didn't seam to wick up to far up the harness. I did spray and clean the first few inches of the harness, they were not that bad. I reconnected it but still does not shift. I think I understand that after I reset the TCU at the 38 pin connector using MB appropriate device it should start shifting.

Did this possibly happen because I started the car with the connector unplugged??

Thanks for any help
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post #4 of 4 (permalink) Old 08-14-2012, 10:21 AM
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i am also having the same problem with another car with the exception that i dont have any leaks. The car is stuck in 2nd gear.
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