722.9 Transmission advice..
Thread Starter
Newbie
Joined: Nov 2019
Posts: 2
Likes: 0
2004 s500
722.9 Transmission advice..
I apologise if this issue has been brought up before yet, I've searched this forum and could not find a similar problem.
My car's gears would some times slip when I would accelerate but when I would drive at a steady speed it wouldnt. About three weeks ago while I was driving the gear slipped and that was that it wouldn't go forward or reverse. After that I got it towed to a place called S And S Mercedes , he said I needed to replace the transmission. I got it towed back to the house and a few days went by decided to turn it on and to my surprise the car actually went into gear and went forward a few feet at that point I put it in reverse and it went reverse so I made and appointment at AAMCO, when the tow truck arrive I was gonna push the car out to the street but decided to see if the gears would engage and sure enough they did so I drove it out the drive way and into the street without a problem. So at AAMCO I told them to just change the transmission fluid , but he insisted to run a diagnosis and I told him that I don't want none of that all I want is for the transmission fluid to be changed i was very clear and said just changed the oil. So a day went by I called and he said he ran a check anyways and his conclusion was the same to replace transmission. Is it possible that it just needs transmission fluid since it did drive into the street for the tow truck to take it, if my transmission was out and needed to be replaced wouldn't it not drive forward at all?
Any advice thoughts would be very appreciated...
My car's gears would some times slip when I would accelerate but when I would drive at a steady speed it wouldnt. About three weeks ago while I was driving the gear slipped and that was that it wouldn't go forward or reverse. After that I got it towed to a place called S And S Mercedes , he said I needed to replace the transmission. I got it towed back to the house and a few days went by decided to turn it on and to my surprise the car actually went into gear and went forward a few feet at that point I put it in reverse and it went reverse so I made and appointment at AAMCO, when the tow truck arrive I was gonna push the car out to the street but decided to see if the gears would engage and sure enough they did so I drove it out the drive way and into the street without a problem. So at AAMCO I told them to just change the transmission fluid , but he insisted to run a diagnosis and I told him that I don't want none of that all I want is for the transmission fluid to be changed i was very clear and said just changed the oil. So a day went by I called and he said he ran a check anyways and his conclusion was the same to replace transmission. Is it possible that it just needs transmission fluid since it did drive into the street for the tow truck to take it, if my transmission was out and needed to be replaced wouldn't it not drive forward at all?
Any advice thoughts would be very appreciated...
Senior Member
Joined: Jun 2013
Posts: 287
Likes: 5
From: New Hampshire
Magma Red W208 55 AMG, W203 C230 Kompressor Sedan 6speed M/T, W220 S500
Did either shop give you any details of their findings when they scanned your car? Trouble codes, descriptions of what is failing?
I only ask because I recently bought the same car and I'm working through some transmission problems as well. Good luck!
I only ask because I recently bought the same car and I'm working through some transmission problems as well. Good luck!
MBWorld Fanatic!
Joined: Jan 2008
Posts: 6,150
Likes: 533
Mercedes
Fluid will not fix your problem .
You either need a new valve body coded to your car or a complete used transmission coded to your car . These can be found and Installed cheap but Both require online scn coding and virginizing the conductor plate by a Mercedes specialty shop , a dealer won’t generally do it
yup u can’t just swap the part and expect it to work
You either need a new valve body coded to your car or a complete used transmission coded to your car . These can be found and Installed cheap but Both require online scn coding and virginizing the conductor plate by a Mercedes specialty shop , a dealer won’t generally do it
yup u can’t just swap the part and expect it to work
Thread Starter
Newbie
Joined: Nov 2019
Posts: 2
Likes: 0
2004 s500
O man did they it was page after page I'll post them when I get home 👍
Super Member
Joined: Feb 2007
Posts: 601
Likes: 285
From: Republic of Texas
W203 W212 W211 R53MCS
2004 was the first year MB introduced the 722.9 transmission in North America. And boy did they have issues..... from bad valve bodies to blown pistons on clutch packs. Like it was mentioned, doing a fluid change will not fix anything.
