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Unread 05-14-2008, 05:40 PM   #1
LibertyOrDeath
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2005 KJ Liberty 
 
Join Date: Dec 2006
Location: san jose, CA
Posts: 90
P0740 diag code, any advice/ Torque Conv Clutch

Great resource for code access and their meaning by the way:
http://www.wjjeeps.com/faultcodes.htm
4 off/on cycles of your ignition then read the code in the digital ODO display.

Ours says this one:

P0740 (M)
Torque Con Clu No RPM Drop at Lockup
Relationship between engine and vehicle speeds indicated failure of torque convertor clutch lock-up system (TCC/PTU sol).

A solenoid failing or the actual torque converter or - ? Any one had experience with this? thanks in advance.

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Unread 05-14-2008, 05:47 PM   #2
LibertyOrDeath
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Join Date: Dec 2006
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P0740 Torque Converter Clutch problem defined, link

found answer (sort of) on
http://www.rvmechanic.com/current_ca...l?print_page=1

Re: P0740 Torque Converter Clutch Circuit Malfunction Joel 5-10-07

If you get the P0740 code it means there is a problem with either the torque converter or the control system for the torque converter in your car. It might be such a slight problem that you dont notice anything, or it may be totally undriveable. It depends on what part of the system failed and how badly it failed. To fix it, it can be anything from a simple fluid and filter change (to get debris out of the fluid that might be clogging the solenoid up), or it could be an electrical problem (such as the solenoid, or wiring) or it could be the torque converter itself has failed (which would mean the entire transmission is likely ruined from the debris). It IS definetly a difficult problem to diagnose, and impossible to diagnose without taking anything apart (or at least test driving it with some diagnostic equipment). Starting with the basic (inexpensive) stuff like a fluid flush and filter change and working your way up from there is usually the best way to go, as long as the car is still driveable. Hope that helps (since everyone else only seems to know how to ask the same question over and over and nobody ever posts answers on here).
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Unread 05-14-2008, 05:49 PM   #3
LibertyOrDeath
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So has anyone gone further, more info or results from experience?
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Unread 07-13-2009, 04:20 PM   #4
CallMeColt
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1999 XJ Cherokee 
 
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Quote:
Originally Posted by LibertyOrDeath View Post
found answer (sort of) on
http://www.rvmechanic.com/current_ca...l?print_page=1

Re: P0740 Torque Converter Clutch Circuit Malfunction Joel 5-10-07

If you get the P0740 code it means there is a problem with either the torque converter or the control system for the torque converter in your car. It might be such a slight problem that you dont notice anything, or it may be totally undriveable. It depends on what part of the system failed and how badly it failed. To fix it, it can be anything from a simple fluid and filter change (to get debris out of the fluid that might be clogging the solenoid up), or it could be an electrical problem (such as the solenoid, or wiring) or it could be the torque converter itself has failed (which would mean the entire transmission is likely ruined from the debris). It IS definetly a difficult problem to diagnose, and impossible to diagnose without taking anything apart (or at least test driving it with some diagnostic equipment). Starting with the basic (inexpensive) stuff like a fluid flush and filter change and working your way up from there is usually the best way to go, as long as the car is still driveable. Hope that helps (since everyone else only seems to know how to ask the same question over and over and nobody ever posts answers on here).
I have read a bunch of posts on this, and I like this reply the best. I had the code come up on mine, and I WILL follow up on it for everyone!
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Unread 07-21-2009, 07:17 AM   #5
CallMeColt
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1999 XJ Cherokee 
 
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Location: Waterbury, CT
Posts: 219
Ok, I have driven quite a bit in my Jeep after having it worked on. Some of the other posts said draining, flushing, and replacing the filter in my tranny would do the trick. That seems to be the case for me. My buddy who does all the work for me, showed me the filter and it was very dirty. We reset the computer and erased the codes. It has not come back on, and I have noticed my engine to idle much more even than before. Hope this helps some people! Give this a shot first and see if it helps you out.
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