P0715 code and Oil Wicking on TCU wiring (replace the Trans 13 pin connector??)
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,227
Likes: 185
From: Chicago
E63 SL55 996TT C5Z06
P0715 code and Oil Wicking on TCU wiring (replace the Trans 13 pin connector??)
hey guys.
so my 2004 c240 4matic wagon hit 125k on the clock and just started some funny trans issues. had 2 times now where it goes to limp mode into 4th gear and wont shift up/down but will go into R or Park.
1 of those times it threw a CEL and i saw the P0715 code "Input/Turbine Speed Sensor A Circuit" which I cleared with my ODB reader and car has been driving normally.
i checked on the forums here and see it could be related to a leaking trans 13 pin connector (p/n 2035400253) which can cause leaking oil to WICK up to the TCU which I read in this very helpful thread that Glyn gave very helpful advice on. https://mbworld.org/forums/c-class-w...wards-tcu.html I went and checked for oil on my TCU today by pulling the passenger front carpet up and getting access to the TCU module and wiring and sure enough the wiring had some yellow brown oil on it. It was NOT puddled up but definitely noticeable on the wiring but not on the TCU, so after numerous wipings with paper towels it looks cleared up.
I ordered a MB OEM new trans 13 pin connector (which MB calls a PILOT BUSHING for some reason - https://www.mercedespartshub.com/oem...ing-2035400253) and will get that replaced.....
Anyone else who's had this issue - did replacing the 13 pin trans connector fix your issue??? Or did you have to deal with repair/replace of the TCU module and/or the Valve Body? Am hoping the 13 pin connector replacement fixes it.
thx for any feedback fellas. still love my 2004 4matic wagon after 125k miles!!!! thx!
so my 2004 c240 4matic wagon hit 125k on the clock and just started some funny trans issues. had 2 times now where it goes to limp mode into 4th gear and wont shift up/down but will go into R or Park.
1 of those times it threw a CEL and i saw the P0715 code "Input/Turbine Speed Sensor A Circuit" which I cleared with my ODB reader and car has been driving normally.
i checked on the forums here and see it could be related to a leaking trans 13 pin connector (p/n 2035400253) which can cause leaking oil to WICK up to the TCU which I read in this very helpful thread that Glyn gave very helpful advice on. https://mbworld.org/forums/c-class-w...wards-tcu.html I went and checked for oil on my TCU today by pulling the passenger front carpet up and getting access to the TCU module and wiring and sure enough the wiring had some yellow brown oil on it. It was NOT puddled up but definitely noticeable on the wiring but not on the TCU, so after numerous wipings with paper towels it looks cleared up.
I ordered a MB OEM new trans 13 pin connector (which MB calls a PILOT BUSHING for some reason - https://www.mercedespartshub.com/oem...ing-2035400253) and will get that replaced.....
Anyone else who's had this issue - did replacing the 13 pin trans connector fix your issue??? Or did you have to deal with repair/replace of the TCU module and/or the Valve Body? Am hoping the 13 pin connector replacement fixes it.
thx for any feedback fellas. still love my 2004 4matic wagon after 125k miles!!!! thx!
MBWorld Fanatic!
Joined: May 2017
Posts: 2,290
Likes: 434
C320
If ATF got into the TCM it can be disassembled and clened with isopropyl alcohol. This is a good time to reflowed the large solder joints on the PCB which tend to crack. Keep in mind that P0715 is just a generic OBD2 code telling you there's a problem with the trabsmission. You need a scan tool that can talk to the TCM directly and read/clear transmission codes. Generic OBD2 OBD2 code reader won't cut it.
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,227
Likes: 185
From: Chicago
E63 SL55 996TT C5Z06
If ATF got into the TCM it can be disassembled and clened with isopropyl alcohol. This is a good time to reflowed the large solder joints on the PCB which tend to crack. Keep in mind that P0715 is just a generic OBD2 code telling you there's a problem with the trabsmission. You need a scan tool that can talk to the TCM directly and read/clear transmission codes. Generic OBD2 OBD2 code reader won't cut it.
I ordered the transmission 13 pin connector from FCP euro for 15 bucks and will get that installed and hopefully that solves my problem from ever coming back again. My trans fluid is mostly red and was changed a year ago so I think I’m OK there. I just hope I don’t have to deal with the trans conductor plate and having to get a new one of those.
I’ll post an update once I get that 13 pin connector thing replaced which it’s leaking Obviously if I’m getting trans fluid on the wiring harness
MBWorld Fanatic!
Joined: May 2017
Posts: 2,290
Likes: 434
C320
tjts1 hey Buddy thanks for the feedback. I have some CRC electronics cleaner spray that I used to clean up the wiring harness and carefully cleaned the TCU connector and took it for a drive and all was fine.
I ordered the transmission 13 pin connector from FCP euro for 15 bucks and will get that installed and hopefully that solves my problem from ever coming back again. My trans fluid is mostly red and was changed a year ago so I think I’m OK there. I just hope I don’t have to deal with the trans conductor plate and having to get a new one of those.
I’ll post an update once I get that 13 pin connector thing replaced which it’s leaking Obviously if I’m getting trans fluid on the wiring harness
I ordered the transmission 13 pin connector from FCP euro for 15 bucks and will get that installed and hopefully that solves my problem from ever coming back again. My trans fluid is mostly red and was changed a year ago so I think I’m OK there. I just hope I don’t have to deal with the trans conductor plate and having to get a new one of those.
I’ll post an update once I get that 13 pin connector thing replaced which it’s leaking Obviously if I’m getting trans fluid on the wiring harness
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,227
Likes: 185
From: Chicago
E63 SL55 996TT C5Z06
FCP Euro - 13 pin trans connector for w203 /MB OEM https://www.fcpeuro.com/products/mer...tor-2035400053
W203 / TCU location and how to access to clean trans fluid wicking:
722.6 / trans connector replacement - 13 pin connector
Junior Member
Joined: May 2020
Posts: 54
Likes: 5
2004 W211 e55 amg / 2003 w163 ml500
icarsoft I980
If ATF got into the TCM it can be disassembled and clened with isopropyl alcohol. This is a good time to reflowed the large solder joints on the PCB which tend to crack. Keep in mind that P0715 is just a generic OBD2 code telling you there's a problem with the trabsmission. You need a scan tool that can talk to the TCM directly and read/clear transmission codes. Generic OBD2 OBD2 code reader won't cut it.
you can see the m113 rebuild on my YouTube channel @TheLongRanger55
My current code reader.
Last edited by bigkermw211e55; Jan 25, 2024 at 02:32 PM.
