C240 Transmission - Mercedes-Benz Forum
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post #1 of 15 Old 06-20-2007, 10:30 PM Thread Starter
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C240 Transmission

I was driving my 02 C240 today and while I was driving the car appeared to slip into neutral. I move the gear up to N and back to Drive and it took off fine. The transmission worked fine all day and after the incident. Any ideas?
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post #2 of 15 Old 06-20-2007, 10:56 PM
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Did you happen to see if the indicator in the instrument cluster said N? or did it remain in D?
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post #3 of 15 Old 06-20-2007, 11:03 PM Thread Starter
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No I didn't even think to look. I will see if I can get it to do it again and let you know. HAve any idea what it might be?
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post #4 of 15 Old 06-20-2007, 11:15 PM Thread Starter
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I couldn't get it to do it again but the last short trip to the store it did it twice. I did notice the button with the W S on it was set on W.
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post #5 of 15 Old 06-23-2007, 03:26 PM Thread Starter
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Ok, it happened again today while I was driving. The dash said it was still in drive when it happened. I put it in neutral and then it went into gear but stayed in the same gear. I stopped, turned the car off and started again and it worked fine. What do you think? Thanks for the help!
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post #6 of 15 Old 06-23-2007, 09:53 PM
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Sounds to me like it could either be low fluid, or maybe an RPM sensor going bad. You should have to get it diagnosed properly.
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post #7 of 15 Old 06-24-2007, 07:57 AM Thread Starter
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I will take it in. Is there anyway I can add fluid just in case? What kind should I use and where does it go?
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post #8 of 15 Old 06-24-2007, 04:47 PM
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No, not really
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post #9 of 15 Old 06-24-2007, 06:50 PM Thread Starter
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Well hopefully I didn't mess it up. I pulled off the cap for the transmission fluid which seemed to be locked. I poured in some synthetic treatment and about one bottle of fluid. I just drove it into downtown Atlanta and back with no issues. Is there anyway to know if the fluid level is too high or low? Thanks again for the help!
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post #10 of 15 Old 06-27-2007, 11:38 PM
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Mercedes-Benz tried really really hard to make it so only certified MB techs can work on their transmissions. That's why they designed their so called "sealed" transmission. The 722.6 (like yours) transmission is kinda a feat to simply check the fluid level. The 722.9 (new 7-speeds) transmissions are damn near impossible to simply check the fluid level, even for a certified MB shop. In your case, you really should have no need to check your transmission fluid level unless you find it leaking. So then, you simply repair the leak and correct the fluid level. A fluid and filter change never hurts. But it's not even an MB recommended maintainance on these newer transmission. But I don't think it's necessarily a bad thing to change it, say every 100k miles or so.

Did you ever check to see if maybe you did have a leak? It would only leak in two ways, really. Externally (with drops on the ground), or through the radiator/transmission cooler. You'd be able to tell if this is the case by popping open the coolant reservior and checking for traces of transmission fluid.
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