P0730 and whining, transmission related
Thread Starter
MBWorld Fanatic!
Joined: Apr 2017
Posts: 1,120
Likes: 80
From: Tampa Bay, FL
05 E55, 98 CLK320
P0730 and whining, transmission related
Hi fellas
I got a P0730, incorrect gear ratio
Symptoms:
Leading up to it it would stutter around 60-70mph when I press on the pedal more than halfway. I thought it was my supercharger not engaging (it's on its way out) but... I was driving over a bridge and it completely just disengaged, revved up all the way and the problems started. I crawled my car home after letting it cool down.
So far I've tried checking and adjusting the fluid- no change. I reset adaptations and CEL, took it for a drive- 10 minutes later same issue. Whines and won't engage fully.
Next on my list is to drain the fluid and replace the filter and check for shavings, I just put this transmission in 3 weeks ago (it was used) but maybe there is some crap in it as it's been sitting idle for over a year.
I have DAS, what can I try to test it?
I have a spare conductor plate I can try swapping but I doubt that's what it is. Some people pointed out the pump might be on it's way out... I want to see if there is anything I can do to diagnose it ahead of time before I buy parts and drop it again.
Side note: Can someone drop some knowledge on how I can find a new torque converter for it? What numbers can I look at? Junkyard said it's from an SL55, mechanic said torque converter is special-- I really wanted to replace it but we went ahead an installed it as is. Now problems... same symptoms as the previous transmission too.
I got a P0730, incorrect gear ratio
Symptoms:
Leading up to it it would stutter around 60-70mph when I press on the pedal more than halfway. I thought it was my supercharger not engaging (it's on its way out) but... I was driving over a bridge and it completely just disengaged, revved up all the way and the problems started. I crawled my car home after letting it cool down.
So far I've tried checking and adjusting the fluid- no change. I reset adaptations and CEL, took it for a drive- 10 minutes later same issue. Whines and won't engage fully.
Next on my list is to drain the fluid and replace the filter and check for shavings, I just put this transmission in 3 weeks ago (it was used) but maybe there is some crap in it as it's been sitting idle for over a year.
I have DAS, what can I try to test it?
I have a spare conductor plate I can try swapping but I doubt that's what it is. Some people pointed out the pump might be on it's way out... I want to see if there is anything I can do to diagnose it ahead of time before I buy parts and drop it again.
Side note: Can someone drop some knowledge on how I can find a new torque converter for it? What numbers can I look at? Junkyard said it's from an SL55, mechanic said torque converter is special-- I really wanted to replace it but we went ahead an installed it as is. Now problems... same symptoms as the previous transmission too.
Last edited by MACEDON; Nov 16, 2020 at 06:43 AM.
Junior Member
Joined: Feb 2016
Posts: 58
Likes: 9
From: Canada
'06 E55 / '10 GLK 350
Had same problem 2 years ago, changed conductor plate and problem was solved. Early this summer I went for a lapping session and the same problem occured again.
Had to rebuild the transmission, pump and converter were trashed.
Had to rebuild the transmission, pump and converter were trashed.
