Torque converter not locking. - Ford Powerstroke Diesel Forum
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Old 12-26-2012, 09:15 AM
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Torque converter not locking.

Got a code of p0741 and p1744 torque converter won't lock in over drive anymore. Guessing I've gotta bad converter or solenoid. But which would it be? i passed someone this morning running about 60-70mph the tc unlocked and rpms raised a good bit. (it did not down shift). then i got a wrench light come up. checked the codes and got p0741 and p1744. trans temp never raised. now the next part i'm pretty much guessing at but someone correct me if i'm wrong. shouldn't the rpm and imput shaft rpm be the same? at least while the converter is locked?

Last edited by JD_MILLS; 12-26-2012 at 06:43 PM.
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Old 12-26-2012, 06:45 PM
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anyone? really need some help to figure this one out
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Old 12-26-2012, 06:49 PM
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I would try the solenoid first and see if it fixes it. It sounds like maybe the solenoid is bad and therefore you couldn't hold drive line pressure to keep the converter locked.
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Old 12-26-2012, 07:13 PM
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Any one ever heard of checking the tc this way? its got some pics to just cant get them to load but heres the link to it http://www.atraonline.com/gears/2007...2007_03_08.pdf

Here’s a quick method for testing the pump and converter
at the same time, using a tool you can build in 3 easy steps,
from an old TCC solenoid:
Step 1: Bend the 4 tabs back with a screwdriver (figure 4).
Step 2: Remove the solenoid parts (figure 5). It isn’t
Figure 4 necessary to remove the allen screw and spring from the tipof the solenoid.
Step 3: Secure the solenoid plunger
to the solenoid snout with a small hose
clamp (figure 6). Be sure to align the
hose clamp screw with the flat on the
solenoid snout (figure 7). If it isn’t
aligned properly, it won’t fit into the
solenoid body.Now you’re ready to put your new
tool to work on the transmission:
• Drop the pan down and replace
the TCC solenoid with the tool
(figure 8).
• Replace the pan and the
fluid.…and you’re ready to
go.
I’ve done this procedure and it
takes only 20 minutes, if that.
CAUTION: This will engage the
TCC all the time, and in all ranges. If
the torque converter and pump are operating
properly, the transmission will
kill the engine as soon as you put it in
gear. Engaging the transmission with
the TCC applied will be very hard on
the TCC lining, so keep your testing toa minimum.
If the engine stalls with the test
tool in place, the converter clutch and
lockup valve are working properly. We
already know the computer signals are
correct.

Last edited by JD_MILLS; 12-26-2012 at 09:47 PM.
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Old 12-27-2012, 06:24 PM
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tranny codes!!!

Can anyone tell me what these two codes mean i've searched for two days now and still have yet to find an answer p1744 p0741
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Old 12-27-2012, 07:57 PM
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Quote:
Originally Posted by JD_MILLS View Post
Can anyone tell me what these two codes mean i've searched for two days now and still have yet to find an answer p1744 p0741
P1744: torque converter clutch solenoid circuit performance.

P0741: torque converter clutch performance/stuck on.


Sent from my iPhone using AutoGuide.com App
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Old 01-23-2013, 10:20 AM
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Ever get it figured out...mines doing the same thing. Has been for a few months actually. I feel your pain in trying to research this, I looked a while back and couldn't find anything conclusive. Ever get it fixed?
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Old 01-23-2013, 11:14 AM
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My torque converter started acting up just like this too. After a couple months of snowballing problems with my trans, I scrounged up some money for a custom trans to handle the higher horsepower tunes.
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