S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

P0894 and transmission up to 3th gear. Help

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Old Feb 12, 2019 | 01:42 PM
  #1  
dgodfather's Avatar
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W220, w164
P0894 and transmission up to 3th gear. Help

Hello to everyone !
I have w221 s320cdi 4 magic with 7g tonic (722.9) transmission.

I have replaced gearbox oil about 1 month ago and it was perfect.
Yesterday I drove the car all day, as usual , but in the evening when I have finished work and drive to home , my car has 1st, 2nd and 3th gear. There is no from 4 to 7 gears...
The reverse is working perfect.

I checked the transmission with diagnostic and there is only one mistake P0894 which means : Transmission component slipping.

I check oil - it is perfect.

Please, give me your opinions.
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Old Feb 14, 2019 | 03:02 PM
  #2  
boardboy330's Avatar
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Joined: May 2009
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From: Frederick
2000 ML320, 2005 E320 CDI
I had this same issue, I took the pan down, took the valve body out and removed the solenoids one at a time and cleaned them (carefully) via a youtube video I saw. No mechanic would touch my trans (including the shop that flushed it to cause the issue) after it was screwed up. Did that about 1500 miles ago and no hiccups since. I will tell you replace ALL the bolts you remove. Do not skimp...you will break them off.
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