![]() ![]() replaced the oil and filter along with the pilot bushing. The wiring was also soaked, took elelctrical cleaner and cleaned it all. Took it out and cleaned the TCU even took it apart and clean it out. The pilot bushing was leakimg and was replaced along with the solenoid plates inside the valve body. If there are, then this may be the problem.Īll your info was found to be true. Once you remove those nuts, you'll be able to fold the aluminum panel back and see the TCU and wiring harness show in C230's photo. Behind that is an aluminum panel that has a few nuts holding it in place (the ones on the bottom edge are hard to see because of the angle, but you can feel them or use a mirror). Under the carpet, you will find a Styrofoam insulation panel, which can be removed. You only need to pull it down from the sloped part to the crease - you don't need to pull it back to expose the flat floor pan. You can normally just pull on it and it will peel back and come out from under the kick panel and center console. You might find it easier to do this with the plastic kick-panel on the right side removed, though that is not necessary. To get to this part, go to the front passenger side floorboard and pull down the carpet from the top edge, under the dash. Look at C230 Sport Coup's photo three posts above. I would NOT recommend throwing expensive transmission parts at the car without a good diagnostic report. Once you have the diagnostic report you can have your friend fix the transmission for you if need be. If these are NOT the issues, then I would suggest you get your car to a Mercedes-Benz indy with Mercedes-Benz STAR Diagnostic System which will not just read the fault codes but can also run a bunch of tests and checks on your transmission systems to see what is not working properly and would need to be fixed. The above two inspections are visual inspections for transmission oil leakage. that little black box houses the TCU) and look for any sign of oil. Just pull the front passenger kickplate carpet back (then foam and metal cage. If there is an transmission oil leak at the transmission pilot bushing / adaptor, the transmission oil could possibily wick upward and into the cabin to attack the TCU (under passenger kickplate) - unlikely but it could happen. Search, there's lots of DIY on this easy fix. ![]() Look for oil leak stains near the transmission oil pan originating from just above front passenger corner of transmission oil pan. *** Inspect this first: *** The transmission pilot bushing - adaptor (MB# A203-540-02-53 / about $12 part) is a common weak point where transmission oil leaks through weakened O-rings. Mercedes transmissions are usually quite durable, when looking for a problem its a good idea to start at the lowest cost fixes first and work your way up. If there is oil then clean with CRC QD Electronic Cleaner and pray! Might also be a good idea to try to reset TCU by unplugging it overnight (obviously engine off - key out!) or at least hope so since its a relatively easy and cheap fix.Ĭheck your Transmission Control Unit for oil - under the passenger kickplate carpet - not likely to have oil there, even if there's oil at TCU tranmission oil is technically NOT a conductor of electricity. Search for DIY and its a good idea to change the transmission oil (partial) and filter while you're working on this. ![]() Its under the car just above the transmission oil pan at the front passenger corner - protected by heat shield. *** Check for transmission oil leak at the pilot bushing - adaptor (MB# A203-540-02-53 / about $12 part) - two O-rings stretches too much over time and oil leaks into electrical plug at transmission. Transmission oil level should be checked at 80 degree Celsius with proper dipstick (search if you need to make one) Should have transmission oil changed every 39K miles (60K km), regardless of what MB-USA says. can anyone that has come across this type of problem with solutions give me guidance. The car is sitting at a friends trans shop but he as well is not a Mercedes transmission specialist. I have pulled the trans pan and its clean, no residue of clutches or metal or burnt smell with the oil. Some claim the transmission is shot others talk about the TCM being soaked with trans fluid and causing a short. there are many differences on a possible solution. I have read mulitple threads about this issue and also about the codes. I just dont have the background for transmissions or Mercedes for that matter. I'm been a tech since early 80's and now I'm an instructor for a local high school. I used a Snap-on Solus to retrieve transmission codes. The car will drive 100% for approximately a mile then goes into limp mode. A couple of days ago the transmission started acting funny and would get stuck in 2nd gear. ![]() I have a 2002 c230 Kompressor that i have owned for a year and half. Hello, thank you for looking at my thread and assisting with my problem. ![]()
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