Impermissible Ratio with a 722.6
 

My wife has a 2000 C280 with 216,000 miles on it. We had the codes read for other issues and it showed impermissible ratio, although it doesn't seem like it has mechanical issues (no slipping). Is this just showing it's age and still has a bunch of life left or is it the beginning of the end? The car needs money for the other things and I was wondering if I should spend the money fixing them or sell it. Replacing the transmission would not be worth it. Generally speaking, what's the life expectancy of them? I'm used to standard transmissions, not much experience with slush boxes.

Thanks

Most often that code shows up when the trans is low on fluid. I'd initially want to know the fluid level and fluid condition. Assuming both ok, I'd see what the adaptations look like to make sure that one of the clutch packs hasn't maxed out. Lastly a check for fluid contamination of the TCM, potentially screwing with a speed sensor reading.

It's got a transmission oil leak so I checked the level and it's ok. It's due for a transmission oil change. The other problem it had is the conductor plate is occasionally telling the transmission controller not to go into gear. And then the throttle body actuator is occasionally not actuating, hence the debate whether to fix it or sell it.

The conductor plate and connector are a known issue so I would replace that. I don't think it is super hard to do, although I never did one myself. There are several videos on YouTube showing the process. Mine is still going strong at 360,000+ miles with the new owner.