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Thread: Torque converter clutch circuit open...

  1. #1
    Join Date
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    Torque converter clutch circuit open...

    My check engine light came on today on the way home, so I stopped by autozone to get it checked out.


    Torque converter clutch circuit open is the code I got. I did some searching online, and found suggestions to change the gearbox oil.

    I've got no problem at all with doing that...it's just that my car has 154,xxx miles on it..is there anything I should be worried about with that many miles, changing my transmission fluid?

  2. #2
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    I've heard this go both ways. If the fluid is original or rather old, there could be a chance (or is it a myth?) that the worn particles are providing enough friction against the clutches to prevent any slipping. Once new fluid gets poured in and the particles disappear, the transmission starts to slip. Of course others say it's purely a myth and new fluid is better for the moving parts...

    My personal experience? Changed the original fluid on a car at 80k miles, and blew the tranny a week later while racing. Possibly coincidence though, as the car was driven rather hard.

  3. #3
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    Heh, that kills me to hear.


    Can I drive with this code, or will it be decremental to my transmission?

    I was thinking about changing the fluids inside of the transmission...but doing it while cold...so I remove the bulk of the old gross stuff, while theoretically leaving some of those "worn particles" in there...

  4. #4
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    BMW 528iA
    I had similar problem.
    You have to change TCC solenoid valce ($40 at a diler), oil, filter and gaskets.

    No, it's not OK to drive it over 50 mph.

    BMW 528i Automatic - Premium and Winter Package - Avital Remote Starter - XM Satellite Radio - e60 wheels - LPG

  5. #5
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    It wasn't on when I started my car this morning, and it drove completely fine today.



    Phantom CEL...?

  6. #6
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    1999 528I
    Hi BMW 528, I've been doing a lot of research on the PO40 and TCC Solenoid. I have cleared the code, dropped the pan and replaced the fluid and filter. Fluid was clear and pan is clean. The transmission was and still is smooth with no noticeable issues.

    The car was okay for a few weeks, but the code is back. You simply stated to change the TCC Solenoid, a $40 part. Can you let me know is this something I can do myself? If so, can you list a few simple steps as I am already familiar with how to drop the pan and replacing the fluid.

    Any help is very much appreciated.

    Thank you! Philip
    Last edited by philipk2003; 08-24-2010 at 10:16 AM.

  7. #7
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    98 540i, 11 silverado
    This is a shot in the dark but you also may want to look at the ignition switch. Sounds weird right? Now this was on my 96 silverado but I got codes for the TCC Solenoid, and shift A & B solenoids. First instinct, call tranny shop and they said rebuild. Couldn't afford that so I thought changing tranny fluid might work. So I dropped the pan and changed the filter and fluid. problem went away for months and then came back. The truck would default to 3rd gear only. Did a whole lot of digging online and found the ignition switch may be the problem. Put new switch in and the truck drove great. No problems since and this was 2yrs ago.

    Not saying this is the culprit, but it was my issue with similar codes on another vehicle. good luck


    98 540i sport

    "LIVEN"-taking a finely tuned performance car to it's limits. One hell of a rush

  8. #8
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    1991 325ix Coupe/ 981
    I just got this same problem. Is it causing the car to shake?

  9. #9
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    Quote Originally Posted by DJKapeesh View Post
    I just got this same problem. Is it causing the car to shake?
    In just had my car start shaking around the 60mph mark. I had the codes read and 0740 is also what popped up. Is there a DIY for this part or its it a drop the tranny deal?
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  10. #10
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    P0740 is a general TCC slip code. It points to a problem with a complete subsystem of the transmission without singling out a particular component. Many many code charts misidentify this as an electrical circuit code.

    Bottom line, further diagnosis is needed.


    /.randy

  11. #11
    Join Date
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    02 E39 530i
    I have an 2002 530iA with 116k miles. I have the same code and Ive replcaed the atf and filter and the code always comes back. I have reset it couple times now.

    there was a guy on this form offering bmw code diagnostics and for P0740 it says to replace the torque converter.

    here is the statement:
    SI B 24 03 06
    Automatic Transmission December 2008
    Technical Service
    This Service Information bulletin supersedes SI 24 03 06 dated February 2008.
    designates changes to this revision
    SUBJECT
    ZF 5HP19 Transmission - Diagnosis of EGS FC 048 (30 hex)
    MODEL
    E46 : 323i, 325i, 330i with M52TU, M54 , M56 and ZF 5HP19
    E39 : 525i, 530i with M54 and ZF 5HP19
    E85 : Z4 roadster 2. 5, 3. 0 with M54 and ZF 5HP19
    SITUATION
    "Service Engine Soon" is illuminated and fault code 048 "Converter lock-up excessive slip" (30 hex or
    P0741 ) is stored in the EGS transmission control module.
    CAUSE
    Possible cause: deterioration of the torque converter turbine shaft seal
    PROCEDURE
    Remove the torque converter. For the removal procedure, refer to Repair Manual RA24 40 002.
    2. Drain the fluid out of the torque converter, and carefully inspect the turbine shaft seal (1) INSIDE
    THE BOTTOM OF THE TORQUE CONVERTER for signs of damage (cracks, splits, etc.) .Helpful Hints:
    3. Use a small flashlight to illuminate inside the bottom of the torque converter to examine the turbine
    shaft seal. The turbine seal is brownish orange in color and measures approximately 1" in diameter.
    If evidence of seal deterioration is found, replace the torque converter.
    Additionally, if the transmission fluid shows signs of deterioration ("dirty fluid"), the fluid should be
    replaced in conjunction with the fluid strainer. For the strainer replacement procedure, refer to Repair
    Manual RA24 31 151.
    Refill and/or top off the fluid level according to Repair Manual RA 00 11 500, using ESSO ATF LT 71141
    (P /N 83 22 9 407 807).
    If after careful inspection it appears that the turbine seal is intact, contact Automatic Transmission
    Enhanced Technical Support (TeileClearing) for further diagnostic instructions. Submit the "regular
    technical support" PuMA case, referencing SI B24 03 06 in its title.
    WARRANTY INFORMATION
    Covered under the terms of the BMW New Vehicle Limited Warranty.
    Please refer to the latest KSD for the appropriate model applicable labor allowances.
    Defect Code
    24 40 02 61 00
    Labor Operation
    24 40 002
    Main Work*
    Replace torque converter
    or
    Labor Operation
    +24 40 502
    Replace torque converter
    *Main Work:
    Use this labor operation number when this is the only repair being performed, or if this is the main
    repair when performed along with other repairs at the same time. If this is not the main repair, refer to
    KSD for the associated (+ ) labor operation code.

  12. #12
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    E36/7 E36/8x2 E46 F25
    P0741 /= P0740

    5HP19 /= 4L30E


    The 4L30 system does not have the detailed sensors or programming to determine if the torque converter is slipping, or something else. In 4th lockup, it compares engine speed to road speed. ANYTHING that causes the relationship of the two to be off, from a slipping T/C to a slipping 4th gear to the wrong size mismatched tires will set the P0740. The ZF units (and the 5L40) have multiple internal speed sensors to able to narrow down exactly where the slip is happening, and thereby can set more detailed codes.
    Last edited by rf900rkw; 10-16-2011 at 05:33 PM.


    /.randy

  13. #13
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  14. #14
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    1997 528i, 2007 328i
    Well, I also had a P0154, which states its the o2 sensor, Bank 2 Sensor 1. It has been a while since these were changed but would a bad o2 sensor cause the car to buck and jerk? I doubt it.
    Arctic Metallic 2007 328i Coupe
    Alpine White 1997 528i
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  15. #15
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    Nah, I don't see a O2 causing that. But then, I don't see a torque converter causing it, either. A bad slipping TCC clutch can sometimes cause a shudder like you drove over a washboard, but nothing I would call a buck and jerk.


    /.randy

  16. #16
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    Its just weird. Its almost like one foot is on the gas then randomly on the brake. Its that kind of sensation. The odd thing about that code is, I had it pop up some years ago. I cleared it and fixed whatever else at the time needed fixing. Never heard from it again until recently. Also, the jerking isnt constant. I can drive for a few miles between each occurance. It just doesnt make sense.
    Arctic Metallic 2007 328i Coupe
    Alpine White 1997 528i
    Orange 2011 Dodge Caliber
    Titanium Silver 1985 325e (RIP), Oxford Green 1992 325i (RIP)
    Sachs Sport Suspension, 18x8.5 18x9 staggered RPM 505
    OEM prefacelift M5 headlights and taillights
    Boston Acoustics Pro50SE speakers, Boston Acoustics Competitor 12" sub
    Boston Acoustics GTA-400M and GT-22 amps, Alpine CDE-HD148BT Headunit

  17. #17
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    So I just got this code today driving home. Looks like replacing the torque converter is going to be the fix since most are saying changing the fluid will only get you a short distance.


  18. #18
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    in your car with 5hp19 replacing the torque convertor under code P0741 /48 would be replace torque convertor
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  19. #19
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    Exactly which code did you get?


    /.randy

  20. #20
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    Apr 2010
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    2003 BMW 530i
    P0741

    Im not sure if the fluid is original. I got the car with 115k on in and it has 148k now. Hopefully its just a fluid change but im not betting on it.
    Last edited by Jgordon0505; 11-11-2011 at 10:42 PM. Reason: Automerged Doublepost


  21. #21
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    For the 5HP19, a P0741 sets when there is greater than 80 RPM slip at max TCC apply for more than 2.5 seconds, the control system passes electrical tests, and it happens in two successive driving cycles. It could be hydraulic, but usually is a bad converter.


    /.randy

  22. #22
    Join Date
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    96 bmw 328is, 98 mitsubishi montero

    code p0741 fix

    My car is an 02 530i. Engine light was on for a year, the car shifts smooth but I noticed that my rpm was a little bit high. @ 75 mph rpm runs about 2750, I know that my previous 01 e39 @ 75 mph it was about 2500 rpm.
    After much research, I decided to replace the torque converter and transmission oil ( pentosin ) , cleared the code and bwallah... rpm now is @ 2500 and no more CEL light. I hope this will help some people having this code.

  23. #23
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    RPM seems normal but thats good that it solved your problem as well. I ended up replacing mine a week later and no CEL in 2 months.


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