w203 722.6 transmission p2502 & p2500
Thread Starter
Junior Member
Joined: Oct 2009
Posts: 38
Likes: 0
From: east coast
benz
w203 722.6 transmission p2502 & p2500
Hello everyone, I am having an issue with my transmission. It seems to runs fine until the transmission warms up, all the gears work, then loses all the drive power like it is in neutral, and makes a whining sound.
I then turn off the car, wait some time for it to cool down, restart it, and it drives fine again, goes through all the gears without whining, then a few minutes later after the transmission gets warm, it has no drive again with the whining noise returning.
I checked the fluid with an official MB dipstick, and the fluid level was fine, but it seemed burnt and cooked. The car has 175,000 miles on it, and I last did the transmission flush/filter changed at 130,000 miles with oem filter and the correct fluid.
Does anyone think this is due to the burnt fluid, like it doesn't have the proper viscosity making it too thin when it's warm making it slip and not engage? Think just a flush/new filter would remedy this?
Any help would be appreciated.
I then turn off the car, wait some time for it to cool down, restart it, and it drives fine again, goes through all the gears without whining, then a few minutes later after the transmission gets warm, it has no drive again with the whining noise returning.
I checked the fluid with an official MB dipstick, and the fluid level was fine, but it seemed burnt and cooked. The car has 175,000 miles on it, and I last did the transmission flush/filter changed at 130,000 miles with oem filter and the correct fluid.
Does anyone think this is due to the burnt fluid, like it doesn't have the proper viscosity making it too thin when it's warm making it slip and not engage? Think just a flush/new filter would remedy this?
Any help would be appreciated.
Junior Member
Joined: Jun 2019
Posts: 46
Likes: 27
From: Florida
2005 SL65 AMG
I’m having the exact same problem in an SL65. I changed the TCM and that did not solve the problem. The conductor plate is only 18 months old, but I’m going to change that too. When it hasn’t warmed up, it shifts great and no whining. As long as it stays steady state, (driving constant speed, no stops) it continues to work fine. Once I get off the highway though. The whine starts and it’s done until it cools off again.
Junior Member
Joined: Jun 2019
Posts: 46
Likes: 27
From: Florida
2005 SL65 AMG
Yes, actually.
I consulted the person I consider to be “the” 722.6 expert. He had this to say.
”Your filter is clogged. Most likely the converter clutch has failed. Or the sprag in the converter has failed. Changing the filter will just be a bandaid for a short period of time like a week or less. But it will tell you if the rest of the transmission is working ok. But the issue will come back and you will need to remove the transmission and replace the torque converter.”
So based on this I am going to order a new OEM converter and swap it out. The trans seems fine as long as it’s not in this bad state (before it warms up)
I consulted the person I consider to be “the” 722.6 expert. He had this to say.
”Your filter is clogged. Most likely the converter clutch has failed. Or the sprag in the converter has failed. Changing the filter will just be a bandaid for a short period of time like a week or less. But it will tell you if the rest of the transmission is working ok. But the issue will come back and you will need to remove the transmission and replace the torque converter.”
So based on this I am going to order a new OEM converter and swap it out. The trans seems fine as long as it’s not in this bad state (before it warms up)
Thread Starter
Junior Member
Joined: Oct 2009
Posts: 38
Likes: 0
From: east coast
benz
Yes, actually.
I consulted the person I consider to be “the” 722.6 expert. He had this to say.
”Your filter is clogged. Most likely the converter clutch has failed. Or the sprag in the converter has failed. Changing the filter will just be a bandaid for a short period of time like a week or less. But it will tell you if the rest of the transmission is working ok. But the issue will come back and you will need to remove the transmission and replace the torque converter.”
So based on this I am going to order a new OEM converter and swap it out. The trans seems fine as long as it’s not in this bad state (before it warms up)
I consulted the person I consider to be “the” 722.6 expert. He had this to say.
”Your filter is clogged. Most likely the converter clutch has failed. Or the sprag in the converter has failed. Changing the filter will just be a bandaid for a short period of time like a week or less. But it will tell you if the rest of the transmission is working ok. But the issue will come back and you will need to remove the transmission and replace the torque converter.”
So based on this I am going to order a new OEM converter and swap it out. The trans seems fine as long as it’s not in this bad state (before it warms up)
