What is up with my tranny?
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What is up with my tranny?
My tranny is currently not smooth. It hesitates or jerks when coming into certain mph. It does it around 25 mph, 40mph and 55mph. Taking the car in tmw and hope they fix it. It's bothering the crap out of me.
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From: Southern California
Some MBs & Bimmers
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From: South CA (LA, 818) & North CA (SJ, 408)
2003 E500
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2015 S550
Mine too
Mine did this too. I took it to the dealer and it needed a new transmission control module. That seemed to fix it, though it still acts a little strange sometimes (holds gears a little to long). That could be caused by the programming which i'm going to have checked on the next service visit.
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Some MBs & Bimmers
The exact service bulletin related to this repair is P-B-27.55/50f
This bulletin covers the
Test for contamination within the radiator
Replace radiator if necessary
tranny flush
Replace tranny if necessary.
My car was in the shop for 8 days while this was performed. Oops, almost forgot, took my car to SouthBay Mercedes
Hope this helps
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From: Toronto
2006 E320 CDi, 2008 3/4 Ton Suburban, 2007 "rice rickshaw" Accord 5 speed
Fortunately for me, my car was still under warranty.
The exact service bulletin related to this repair is P-B-27.55/50f
This bulletin covers the
Test for contamination within the radiator
Replace radiator if necessary
tranny flush
Replace tranny if necessary.
My car was in the shop for 8 days while this was performed. Oops, almost forgot, took my car to SouthBay Mercedes
Hope this helps
The exact service bulletin related to this repair is P-B-27.55/50f
This bulletin covers the
Test for contamination within the radiator
Replace radiator if necessary
tranny flush
Replace tranny if necessary.
My car was in the shop for 8 days while this was performed. Oops, almost forgot, took my car to SouthBay Mercedes
Hope this helps
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Some MBs & Bimmers
I had wondered why a faulty/leaky radiator can cause contamination within the tranny.
Within the service bulletin listed, there is a description on looking for a certain amount of contamination within the tranny fluid and that will corelate the condition of the tranny, and the need for replacement.
So, I am still baffled on how tranny fluid can be so easily contaminted.
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From: Ft. Lauderdale Area, USA
2015 ML 350
The Very Simplest Explanation
There is a line (pipe) that carries Transmission Fluid to and thru the radiator, so that the heat in the trans fluid can be dissipated out the fins of the radiator. This line passes thru the coolant chamber of the radiator but remains separate and closed off so that the fluids can't comingle. When a seam/joint in this tranny pipe develops a hole in a part that is inside the radiator, antifreeze and trans fluid and water mix together and are carried thruout both of these 2 formerly separate systems.
Water and antifreeze are mixed with the Trans Fluid and sent back to the transmission. This spells death to a transmission.
Water and antifreeze are mixed with the Trans Fluid and sent back to the transmission. This spells death to a transmission.
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Thanks for all the help guys. I just got my car back from the dealer and they fixed it. What they did was replace the valve body in the transmission, changed the filter, oil and everything was back to normal.
I've heard about the bad radiator but he said my radiator was still good. I'm just hoping that things don't go bad later on with the radiator and such.
I've heard about the bad radiator but he said my radiator was still good. I'm just hoping that things don't go bad later on with the radiator and such.
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Joined: Mar 2006
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From: Louisiana
03 E500 and Corvette
There is a line (pipe) that carries Transmission Fluid to and thru the radiator, so that the heat in the trans fluid can be dissipated out the fins of the radiator. This line passes thru the coolant chamber of the radiator but remains separate and closed off so that the fluids can't comingle. When a seam/joint in this tranny pipe develops a hole in a part that is inside the radiator, antifreeze and trans fluid and water mix together and are carried thruout both of these 2 formerly separate systems.
Water and antifreeze are mixed with the Trans Fluid and sent back to the transmission. This spells death to a transmission.
Water and antifreeze are mixed with the Trans Fluid and sent back to the transmission. This spells death to a transmission.
And since cooling system pressure is greater than the pressure in the transmission recyle line the antifreeze enters the transmission fluid.
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Joined: Apr 2003
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From: Irvine, CA
2003 E320
Mine did this too. I took it to the dealer and it needed a new transmission control module. That seemed to fix it, though it still acts a little strange sometimes (holds gears a little to long). That could be caused by the programming which i'm going to have checked on the next service visit.
I just had my car taken care of as well at my local dealership about 2 weeks ago. They replaced the TCM, flushed the tranny, replaced some seals, motor and trans mounts, coil pack, spark plug wire, and spark plug for cylinder #4.
My car was also holding the revs for a while until the trans fully adapted to my driving. Maybe your SA forgot to tell you that they reprogrammed the TCM to fully adapt to your driving habits over the next 750-1000 miles.
Now its back to being silky smooth like the day I picked her up. Extended warranties are a must for these earlier mercs.
