You are correct sir!
Oil in ECU / TCU Box?
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Joined: Aug 2009
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2005 CL 65 AMG - TUNED
Oil in ECU / TCU Box?
Hi All,
So last night I took the cover off my ECU/TCU box on my '05 CL65 to check fuses, connectors etc and I noticed that there was quite a bit of oil in the bottom of the box that the ECU / TCU sit in.
It's light weight so I'm thinking it might be from the ABC system - does anyone know what oil carrying components run close / next to the electronics box that would have sprayed / collected in there?
I'm hoping it's not oil leaking someplace and traveling along the wires back to the box!!
I't due into the dealer Monday to swap out my IC pump (preventative vs dead) but wanted to see if you gentlemen had any thoughts?
Cheers everyone.
So last night I took the cover off my ECU/TCU box on my '05 CL65 to check fuses, connectors etc and I noticed that there was quite a bit of oil in the bottom of the box that the ECU / TCU sit in.
It's light weight so I'm thinking it might be from the ABC system - does anyone know what oil carrying components run close / next to the electronics box that would have sprayed / collected in there?
I'm hoping it's not oil leaking someplace and traveling along the wires back to the box!!
I't due into the dealer Monday to swap out my IC pump (preventative vs dead) but wanted to see if you gentlemen had any thoughts?
Cheers everyone.
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From: Long Island, NY
W220 S65 AMG
Luckily the oil is not electrically conductive.
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From: Fairfield county, CT.
2004 Ran SRT-10,2007 S550,2016 E400c
Just a side note.. On the v12 engines you also have the possiability of it being engine oil in the me-sfi ( engine ecu) It is common for the oil presure sensor on the engine and it wicks up the engine harrness.. Ive seen it mistaken for tranny fluid which is more common
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From: Wilton, Connecticut
2003 CLK320, 2000 BMW MCoupe, 1999 BMW 323iS, 1992 Audi 100CS quattro wagon, 1991 Dodge Colt
Check it again in a few weeks
I had the same story on my wife's 320 CLK. The leaky transmssion connector was replaced by a revised part under warranty. Problem was that the new part was also defective, the transmission kept losing oil and it almost fried. I installed a new connector (apparently MB's second attempt to get the part right), and it has been good since. By now MB probably has built the part for your car correctly, but check it for your own peace of mind. Another example of legendary early 21st century MB quality!
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Senior Member
Joined: Feb 2010
Posts: 390
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From: SoCal
CL65, FJ80, Sportsmobile 4x4, Model X Plaid
I have the TCU transmission leak in the tcu box, not that bad actually, just a bit, compared to other folks I've heard with the same leak. On the CL it insulates the tcu without any issues, but I'd like to stop the small leak.
I've tracked down 2 CL W215 part# for the connector near the transmission: O-Rings.
0269974148
0269974048
Is that all I need to swap out or do I need a new connector that connects near the transmission?
Also do I need to change out the harness connector that is at the end where the tcu box is?
I've tracked down 2 CL W215 part# for the connector near the transmission: O-Rings.
0269974148
0269974048
Is that all I need to swap out or do I need a new connector that connects near the transmission?
Also do I need to change out the harness connector that is at the end where the tcu box is?
Last edited by NRL; Feb 7, 2012 at 07:10 PM. Reason: Fix
Senior Member
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From: SoCal
CL65, FJ80, Sportsmobile 4x4, Model X Plaid
I dont think it's ABC. It's transmission oil leaking past the oil ring on the connector, pushing some ATF oil all the way up the wire harness and comes out in the tcu box in the engine bay.. Mine had a small amount but for some people it fills up. It doesn't rally effect the electronic bathed in oil but I think it over fills and leaks out if you don't keep an eye on it.
I think the best route is to get a new inner connector with the 2 red o-rings, replacing it with a new designed one with 2 black o-rings.
I think the best route is to get a new inner connector with the 2 red o-rings, replacing it with a new designed one with 2 black o-rings.
Last edited by NRL; Feb 7, 2012 at 07:09 PM. Reason: Fix
Member
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CL65
i know this is an old thread but some help would be appreciated.
I just took the tcu out of my CL65 and noticed that some oil is leaking from it similar to other posts here. I got the gearbox oil changed about 2000 miles ago - would this have anything to do with this??
Thanks
I just took the tcu out of my CL65 and noticed that some oil is leaking from it similar to other posts here. I got the gearbox oil changed about 2000 miles ago - would this have anything to do with this??
Thanks
Senior Member
Joined: Feb 2010
Posts: 390
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From: SoCal
CL65, FJ80, Sportsmobile 4x4, Model X Plaid
The new part has the better O-rings..
With the old original part, Oil leaks past it and wicks up the wire harness wire(s) insulation..
Lots of models and even Chrysler models have had that issue occuring before they came up with the replacement part with better O-rings.
I think it's ok with alittle oil, but might be an issue if it over fills it.
I have yet to pull the TCU out myself..
How do I lift the fuse box to get to it?
I'm sure it'll be easy after the first time.
With the old original part, Oil leaks past it and wicks up the wire harness wire(s) insulation..
Lots of models and even Chrysler models have had that issue occuring before they came up with the replacement part with better O-rings.
I think it's ok with alittle oil, but might be an issue if it over fills it.
I have yet to pull the TCU out myself..
How do I lift the fuse box to get to it?
I'm sure it'll be easy after the first time.
Member
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CL65
Senior Member
Joined: Feb 2010
Posts: 390
Likes: 2
From: SoCal
CL65, FJ80, Sportsmobile 4x4, Model X Plaid
I recall it was a bit tight to get a hold of it and get it out..
I think the manual mentions lifting the fuse box alittle to get at it easiler.
Thx
Member
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CL65
I just had the hood open normal. To be honest it takes a bit of fiddling about to get the fuse box cover off and after that it is simple to remove the TCU which is located on the left hand side of the fusebox. Slide the TCU up a bit and remove the multiplugs and that's it.
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From: Houston
2003 W211 E55, 2003 W220 S600
small trick
after cleaning the TCU and putting it back flip it around and slide it in so the wire harness connector is on the bottom and not on the top of the TCU this will prevent fluid from going back into the TCU if it wicks up the wires again.
after cleaning the TCU and putting it back flip it around and slide it in so the wire harness connector is on the bottom and not on the top of the TCU this will prevent fluid from going back into the TCU if it wicks up the wires again.
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CL65
Thanks shardul I will do that. Do you know how to remove the housing of the TCU ? I was going to try and clean any oil from inside it but seems to be difficult to get off
Senior Member
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From: SoCal
CL65, FJ80, Sportsmobile 4x4, Model X Plaid
Former Vendor of MBWorld
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From: Houston
2003 W211 E55, 2003 W220 S600
you have to pry it open from the connector side. it is press it. Be careful because sometime when you try to pry it open the screw driver will slip and damage the PCB inside.
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CL65
