P0740 - Torque Converter Clutch - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WK Grand Cherokee & XK Commander Forum > P0740 - Torque Converter Clutch

FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFlowmaster's Force II Axle-back exhaust system for the 201FS: Wranger BRIGHT License Plate LED! Just $3! Great value

Reply
Unread 05-21-2013, 09:26 AM   #1
ashmead
Registered User
2005 WK 
 
Join Date: May 2013
Location: atlanta, ga
Posts: 3
P0740 - Torque Converter Clutch

I have a 2005 GC Limited with the Hemi, bought new, maintained on schedule, with only 72k miles on it. Recently it's begun to throw a P0740 code which says the Torque Converter Clutch solenoid is open. Dealer says transmission (R45RFE?) should be rebuilt.

It drives great, shifts smoothly, will shift into 5th at highway speed, but just won't go into lock-up mode. Fluid level is correct. I can clear the CEL and it will stay off until I go above 60 mpt or so, when normally it would go into lockup.

Will continuing to drive it damage the transmission? Could it be a sticking solenoid? Anyone had this issue and solved it without a rebuild?

ashmead is offline   Reply With Quote
Unread 05-21-2013, 11:09 AM   #2
WJ4x4LIFE
Registered User
 
Join Date: Sep 2012
Posts: 574
Do you know your "built date" of your WK?
WJ4x4LIFE is offline   Reply With Quote
Unread 05-21-2013, 12:14 PM   #3
90grandoneer
Registered User
2006 WK 
 
Join Date: Apr 2008
Location: City of Trees
Posts: 1,677
I would run, not walk away from that stealer, unless they've gone through the complete troubleshooting list. If everything BUT the TCC is woking normally, I think I check that electrical circuit and solenoid/switch valve first. My first impression would be (if they haven't).....another ripoff specialist. Notice how they zeroed in on the last item? Did they tell you they went through all the ts steps indicated in the shop manual? Did they eliminate all other potential causes? I seriously doubt it. For sure, I'd get a second, and maybe third opinion before I did anything. It won't hurt anything, except maybe fuel economy with it not working, unless there is something coming apart internally. May want to do a fluid/filters change first, to see if there is anything abnormal in the pan and/or on the pan magnet. Here's what the FSM says are the likely causes of P0740:

Possible Causes
RELATED DTC P0750 PRESENT
L/R SOLENOID
TCC SWITCH VALVE STUCK
TCC REGULATOR VALVE STUCK
INPUT SHAFT SEAL RING CUT

TORQUE CONVERTER AND/OR INTERNAL TRANSMISSION

Please keep us posted on what you find out.
__________________
06 GCO, Dk Khaki, QDII, Flshing Hi 3rd Bk Lt, MDS "ON" Lt, Airtab Vortex Gens, Debadged, Fumoto Drain Valve, BT Catch Can, Chopped EGR Tube, SRT8 CAI, K&N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tune App, DS Tuner, Cust tubular hdrs w/3 in Magnaflow/Xlerator AP Exh Sys, Bilsteins, SRT Springs/Sways, Cust Eng Cvr, SRT8 frt/rear bumpers, FRI Sidewinder Cam/6.1 valvetrain, SLP 25% UD Pulley, BBK true 90mm T-Body, SOS Ign Coils w/.060 spark plug gaps, SRT Reps with 265/45&295/40X20's.
90grandoneer is online now   Reply With Quote
Unread 05-25-2013, 08:40 AM   #4
ashmead
Registered User
2005 WK 
 
Join Date: May 2013
Location: atlanta, ga
Posts: 3
The build date was 11/04.
ashmead is offline   Reply With Quote
Unread 12-27-2013, 08:23 PM   #5
shmebbr6
Registered User
2005 WK 
 
Join Date: Jun 2010
Location: SAC, CA
Posts: 49
So what did you end up doing? I have a 4.7 limited with the p0740 code but it drives fine.
shmebbr6 is offline   Reply With Quote
Unread 12-27-2013, 08:37 PM   #6
Jeepforthewin
Lucky Charms!
 
Jeepforthewin's Avatar
2005 WK 
 
Join Date: Jan 2013
Location: Jacksonville, Fl
Posts: 2,061
The 545RFE tranny in our 05 Hemi's Is a pretty solid tranny. Sounds like they are trying to pull a fast one on you if you ask me. I agree with others to get a second opinion.
__________________
2010 JKU - Stock for now
2005 WK - 6" lift, 35" BFG's, a lot more (SOLD)
Jeepforthewin is online now   Reply With Quote
Unread 03-06-2014, 01:30 PM   #7
ashmead
Registered User
2005 WK 
 
Join Date: May 2013
Location: atlanta, ga
Posts: 3
I had a new solenoid pack put in, valve body cleaned, plus changed the ATF and the two AT filters. That didn't solve the problem. Still shifts smoothly but no TCC lock-up. No other codes besides 0740 and 0700. I'd like to troubleshoot the electrical connection. Anyone done that?

Am I right in thinking that the TCC solenoid is included in the solenoid pack that I replaced?
ashmead is offline   Reply With Quote
Unread 03-06-2014, 01:37 PM   #8
caulk04
Registered User
2008 WK 
 
Join Date: Jan 2013
Location: Greenville, Pennsylvania
Posts: 736
TCC lockup is controlled by the same solenoid that runs 1st and reverse. Once you're out of first gear, the L/R switch valve switches over and that solenoid then controls a different circuit.

Transgo's shift kit includes a 'self cleaning' L/R switch valve. It's a little plug about the size of two pencil erasers that slides into the valve body just like the stock one. I've installed them twice.

FWIW, I feel this valve, it's circuit or the T/C itself must be at fault. Not the trans itself.
__________________
Tint, Superchips, SRT intake tube, Gibson catback, catch can. One hardcore DD/kid hauler...yeah.
caulk04 is offline   Reply With Quote
Unread 03-07-2014, 02:22 PM   #9
shmebbr6
Registered User
2005 WK 
 
Join Date: Jun 2010
Location: SAC, CA
Posts: 49
Let me know if anyone tries this, I've had this code for 6 months now, just got tranny and 4wd service done and the same code is still posting. I figure I have until next year when smog is due. Really no dealer techs out there have come across this and solved it?
shmebbr6 is offline   Reply With Quote
Unread 03-07-2014, 04:59 PM   #10
unobtanium
Registered User
2010 WK 
 
Join Date: Feb 2014
Location: Shreveport, Louisiana
Posts: 341
Quote:
Originally Posted by Jeepforthewin View Post
The 545RFE tranny in our 05 Hemi's Is a pretty solid tranny. Sounds like they are trying to pull a fast one on you if you ask me. I agree with others to get a second opinion.
I had this happen on my Infiniti G20. The transmission WAS toast...


...however, that was NOT the only thing it was doing wrong. This sounds like you nailed it. I'd certainly get a 2nd opinion!
__________________
Just Empty Every Pocket
Worst vehicle I've owned. Period.
unobtanium is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.