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E-Class (W211) 2003-2009

Code P07981

     
Old Oct 3, 2014 | 08:01 PM
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Code P07981
Hey guys dads e class tranny seems to be screwed up. When putting in reverse or drive, it jerks really hard. He drove it for about a mile and it was perfectly fine, but the gears engage really hard.

Pressure control solenoid C came up as the code. Code P0798**


Any ideas on a fix?

2009 e350
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Old Oct 4, 2014 | 11:49 AM
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konigstiger
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'71 Pinto
Check level/condition of ATF if fine, Electrohydraulic Control Module (ECM) may need to be replaced.
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Old Oct 4, 2014 | 01:50 PM
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Originally Posted by konigstiger
Check level/condition of ATF if fine, Electrohydraulic Control Module (ECM) may need to be replaced.

thank you for the response, do i need a computer or anything special to check level?
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Old Oct 4, 2014 | 03:08 PM
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2008 E350 4Matic, 2011 E350 4matic
I believe you will need the dipstick to check the fluid level. Some make their own, but you can buy it on eBay for around $10-$20. OEM is around $58.
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Old Oct 4, 2014 | 03:20 PM
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konigstiger
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Proper method to check ATF for 722.9 transmission is to use MB system (SDS) shown here http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
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Old Oct 5, 2014 | 08:24 PM
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thanks guys. hopefully it's a simple fix.. how much is an ECM anyway?
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Old Oct 6, 2014 | 04:37 PM
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Originally Posted by Plutoe
Based on your post the issue is with a specific solenoid--you do not need to purchase the complete conductor plate just the solenoid!!---get a proper scan!!



elaborate a bit more? is the conductor plate another name for the ecm?
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Old Oct 6, 2014 | 10:12 PM
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Originally Posted by Plutoe
There is an under hood Transmission Control Module=TCM that manages the shifting process by electrically energizing applicable hydraulic solenoids located on the in transmission conductor plate.

You need to understand the car you drive---do a google search and start learning yourself!!

PS: This is not a DIY project and do not let any weekender tell you otherwise!!

See a good MB transmission specialist!!


thanks, hopefully i don't end up buying parts that don't end up working
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