ml 320 2000 P0743 torque converter clutch solenoid
Thread Starter
Junior Member
Joined: Jan 2016
Posts: 33
Likes: 2
From: San Jose Villanueva, El Salvador, Central America
MB GL 320 CDI 2007 & MB ML 320 2000
ml 320 2000 P0743 torque converter clutch solenoid
Hi. I will really appreciate some help.
My ML 320 2000 transmission is on limp mode due to DTC P0743 Torque Converter Clutch Solenoid Circuit Electrical.
This is what I have done:
1- Connected OBD scanner, cleared codes and P0743 came back instantly and limp mode kept on.
2- Changed transmission oil, filter and TCC solenoid. Cleared the codes and code came back. Limp mode is still on.
3- Read somewhere that my scanner is to basic, and I need a professional one to clear de code.
4- Took it to the shop (not dealer) and their scanner cannot clear the code. It comes back. They checked continuity of the line from transmission computer to transmission conector, even the solenoid plate and it has a resistance reading, but the computer does not send a signal.
Is it the transmission computer shot or the limp mode does not transmit to this solenoid valve? Only the Star Diagnostic System can fix this limp?
Best regards.
My ML 320 2000 transmission is on limp mode due to DTC P0743 Torque Converter Clutch Solenoid Circuit Electrical.
This is what I have done:
1- Connected OBD scanner, cleared codes and P0743 came back instantly and limp mode kept on.
2- Changed transmission oil, filter and TCC solenoid. Cleared the codes and code came back. Limp mode is still on.
3- Read somewhere that my scanner is to basic, and I need a professional one to clear de code.
4- Took it to the shop (not dealer) and their scanner cannot clear the code. It comes back. They checked continuity of the line from transmission computer to transmission conector, even the solenoid plate and it has a resistance reading, but the computer does not send a signal.
Is it the transmission computer shot or the limp mode does not transmit to this solenoid valve? Only the Star Diagnostic System can fix this limp?
Best regards.
Thread Starter
Junior Member
Joined: Jan 2016
Posts: 33
Likes: 2
From: San Jose Villanueva, El Salvador, Central America
MB GL 320 CDI 2007 & MB ML 320 2000
Plutoe, right now I have a AUTEL OBDII Scanner Diagnostic Live Data Code Reader Autolink AL519, which has been very handy for my MB maintenance, but this is the first time I have transmission problems and this model does not erase codes on the TCM just the ECU. What do you think of upgrading to this Autel model:
Best regards.
Best regards.
Thread Starter
Junior Member
Joined: Jan 2016
Posts: 33
Likes: 2
From: San Jose Villanueva, El Salvador, Central America
MB GL 320 CDI 2007 & MB ML 320 2000
Hi Plutoe,
The mechanic connected a LAUNCH X431 SCANNER, and he erased the solenoid code but it inmediately comes back. He says there is a CAN BUS problem between the engine and transmission computers. The harness cables have continuity, is it the transmission computer busted or you think it can be something else. Or the scanner is innadecuate.
Some tip will be greatly appreciated.
Best regards.
The mechanic connected a LAUNCH X431 SCANNER, and he erased the solenoid code but it inmediately comes back. He says there is a CAN BUS problem between the engine and transmission computers. The harness cables have continuity, is it the transmission computer busted or you think it can be something else. Or the scanner is innadecuate.
Some tip will be greatly appreciated.
Best regards.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Plutoe, right now I have a AUTEL OBDII Scanner Diagnostic Live Data Code Reader Autolink AL519, which has been very handy for my MB maintenance, but this is the first time I have transmission problems and this model does not erase codes on the TCM just the ECU. What do you think of upgrading to this Autel model:
Amazon.com: Autel MD802 MaxiDiag Elite Scan Tool: Automotive
Best regards.
Amazon.com: Autel MD802 MaxiDiag Elite Scan Tool: Automotive
Best regards.
Thread Starter
Junior Member
Joined: Jan 2016
Posts: 33
Likes: 2
From: San Jose Villanueva, El Salvador, Central America
MB GL 320 CDI 2007 & MB ML 320 2000
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Junior Member
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From: San Jose Villanueva, El Salvador, Central America
MB GL 320 CDI 2007 & MB ML 320 2000
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Thread Starter
Junior Member
Joined: Jan 2016
Posts: 33
Likes: 2
From: San Jose Villanueva, El Salvador, Central America
MB GL 320 CDI 2007 & MB ML 320 2000
All codes were erased. The transmission worked fine for a couple of days and now is in limp mode again. Codes are P0753 SHIFT SOLENOID A ELECTRICAL and P0715 INPUT / TURBINE SPEED SENSOR A CIRCUIT.
Are the shift solenoid 1-2 and the speed sensor faulty or the solenoid conductor plate faulty?
Are the shift solenoid 1-2 and the speed sensor faulty or the solenoid conductor plate faulty?
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
How did you change the TCC solenoid?
On the right side of the transmission you will find a 13 pin connector. Separate it and in all probability you will find trans. fluid between the two halves. If so, the connector must be replaced with an original equipment part purchased at a dealer.
Code P0743 is a transmission code which is reported by the ECM, and as a result a 3 digit code is stored in the ETC (Trans. Control Module). That code will be either 005 or 101.
After replacing the 13 pin connector and the little fluid that you lost doing so, you must clear the P0743 from the ECM and then you must clear any and all codes from the ETC.
If you do not clear the codes from each module separately you will continue to be in Limp Mode.
Do you understand everything?
On the right side of the transmission you will find a 13 pin connector. Separate it and in all probability you will find trans. fluid between the two halves. If so, the connector must be replaced with an original equipment part purchased at a dealer.
Code P0743 is a transmission code which is reported by the ECM, and as a result a 3 digit code is stored in the ETC (Trans. Control Module). That code will be either 005 or 101.
After replacing the 13 pin connector and the little fluid that you lost doing so, you must clear the P0743 from the ECM and then you must clear any and all codes from the ETC.
If you do not clear the codes from each module separately you will continue to be in Limp Mode.
Do you understand everything?
Thread Starter
Junior Member
Joined: Jan 2016
Posts: 33
Likes: 2
From: San Jose Villanueva, El Salvador, Central America
MB GL 320 CDI 2007 & MB ML 320 2000
Thanks for the info, everyone. I changed the conductor plate, erased the ETC codes and everything went back to normal.
