The electrical connector at the automatic transmission may leak fluid. Over time leaking fluid could migrate through the wiring harness and damage the transmission control module. If that happens a new harness and control module may be necessary to correct the problem.
Transmission May Leak Fluid and Damage Control Module on Mercedes-Benz C230
Average mileage: 90,703 (36,300–183,000)
55 people reported this problem
27 people shared problem details
2000 Mercedes-Benz C230172,000Visitor
CAR HAS BEEN IN LIMP MODE FOR MONTHS....DID SOME READING AND FOUND THIS WIRING HYDRO-ELECTRIC PLUG FITTING TO BE THE CULPRIT. iTS A CHEAP AND EASY FIX. I GOT A GERMAN REPLACEMENT PART FROM CARQUEST AUTO PARTS. ALSO, BOUGHT ELECTRIC CONTACT CLEANER FROM RADIO SHACK. YOU WILL NEED A 7MM SOCKET WRENCH TO REMOVE THIS PART. THE CONNECTOR US ON THE FRONT PASSENGER SIDE OF THE TRANSMISSION. THE WIRES ARE REMOVED BY PULLING A SMALL LEVER- WHITE-YELLOW PASTIC LEVER DOWN FROM LIKE 11:00 TO ABOUT 6:30 (COUNTERCLOCKWISE PULL) YOU NNED A SMALL 7MM SOCKET TO REMOVE THE FAILED FITTING. WHEN YOU PULL THE WIRES OUT OF THE HOLDER- BEWARE OIL WILL COME OUT FAST - SO HAVE YOUR NEW PART READY TO PUT IN. DO MAKE SURE 2 ORANGE O-RINGS COME OUT WITH THE OLD PART ALSO. GOOD LUCK- ITS A VERY EASY FIX. YOU CSN DO IT. IT SEEMS LIKE BULLSHIT THAT TRANS OIL COULD TRAVEL THRU THE WIRES INTO THE TRANSMISSION CONTROL UNIT, BUT ITS BEEN REPORTED. THE TRANSMISSION CONTROL UNIT IS LOCATED BEHIND THE PANEL ON THE PASSENGER'S FEET AREA.
2003 Mercedes-Benz C23066,000Visitor
i have a 03 c230 sports and only 66000 miles on it and the trans is slipping and makes a humming nose when u turn on the car or try to drive it dont no if trans need to be rebuilt.
2006 Mercedes-Benz C23044,000Visitor
not fixed yet car stuck in garage in second gear
2000 Mercedes-Benz C23059,500Visitor
Car would get stuck in park from time to time. Limp home mode activated a few time. Faulty gear selector lever module and transmission plug. Both replaced.
2004 Mercedes-Benz C23038,000Visitor
I had this problem on my 2004 C320 2dr sport coupe. Instead of replacing everything and charging me $1750. They dried out and cleaned the harness and module. Everything seems o.k.
2005 Mercedes-Benz C23058,000Visitor
The wire connector started leaking transmission fluid and by the time it only got worse. I purchased a new connector from Rockauto.com for $15 and replaced the ailing one myself in an hour. Problem solved!
Went to dealer in Smithtown yesterday to have trunk latch fixed. Told me that transmnission fluid is leaking from conductor and I need a new pilot bushing and the harness cleaned at a cost of around $900. Am debating whether to see a transmission place
2003 Mercedes-Benz C230183,000Visitor
transmission missed oil,no computer report,no way to check oil;cooling liquid went into the transmission resulting in a 3000$ transmission rebuilt; all valves were burned;
2007 Mercedes-Benz C23080,000Visitor
Occasionally would go into limp mode but reset if I turned the car off and back on, until this last time it would not reset. Had diagnostics done (but knew from reading pretty much what it was) and they say it's the transmission speed sensor. The sensor only can't be replaced so it's the entire valve body costing $2k. This is a foreign auto repair shop not a Mercedes. I've read the culprit is often leakage from WIRING HYDRO-ELECTRIC PLUG FITTING and people have even repaired this themselves for little cost.
1999 Mercedes-Benz C230142,000Visitor
Will not change past first gear
2002 Mercedes-Benz C230160,000Visitor
was told I needed an m.e modual that's 1500.00
2006 Mercedes-Benz C23090,000Visitor
The Transmission problem cost me $440.00 for parts @ me and a friend did the work but!@I mean but! the dealer(only had to reboot the transmission computer) that cost another$400.00 what a joke! and now this" I'm thinking hard about going back to Honda for real.! P.S. S DON'T EVER BUY ICAR IN STOCKTON,CA AT TOYOTA ,BAD BAD BAD THEY WILL LIE TO YOU, AND STEAL YOUR MONEY WARRANTY COMPANY IS A JOKE THEY WILL NOT HONOR THE WARRANTY THIS IS THE TRUTH THATS WHY IM HERE WARNING YOU.
2003 Mercedes-Benz C230120,000Visitor
I was driving when vehicle just stopped on freeway. I turned vehicle off and restarted and it drove for a little while at 25 mph and I got off the next exit and it stopped again. I made it to my mechanic and I was charged $1100 and when I picked up my vehicle and drove it 3 blocks the problem came back "Really"
2007 Mercedes-Benz C23068,000Visitor
Mercedes has a service campaign recall for this for certain model year C230. Mine was under the service campaign and the dealer had a cover placed on the solenoid. Take your cars in to see if your car is applicable. If not, it is recommended to have the work done either way.
2006 Mercedes-Benz C230Visitor
Same happen and damaged the temp control in the transmission.
tranny control module ruined by fluid wicking up the wire harness from leaking tranny plug adapter
Engine light comes on quite often, problem with smog passing. Dealer says it is a common problem with MB C-230 Kompressor, the oil seal leak damage the wiring harness as well the control module. It should be a recall problem from the manufacturer because it is very common problem with majority of the vehicles.
2005 Mercedes-Benz C23070,000Visitor
Transmission oil started leaking from the harness plug. I got a new plug from rockauto.com for $15 and fixed it myself in an hour. It required me to crawl under the car but it was relatively easy.
2004 Mercedes-Benz C23069,580Visitor
Wire connector leaks and need to clean the control module
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