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Po740 - Torque Converter Clutch Solenoid

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Old 06-11-2012, 02:50 PM   #1
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Question Po740 - Torque Converter Clutch Solenoid

2000 TL - 145K miles, transmission jet kit installed. Had CEL and TCS light come on multiple times last week. Code PO740 TCC clutch solenoid Circuit. No change in how car drives, shifts etc... Note: In multiple test drives, it only throws this code when I'm at highway speed (60+ MPH). If I'm in D4 instead of D5 when while driving at highway speed, I don't get a CEL.

Searching forums, etc... suggested problem could be (1) low fluid, (2) dirty fluid, (3) bad TCC solenoid or something worse that I hope doesn't end up being the problem.

Fluid level was up (overfull actually). I did 3x drain and refill. First drain got 4 quarts + what I spilled from not having the pan in right spot, maybe another pint. Added back 3 quarts each time, as this is how much is supposed to drain out. Fluid level is now correct. Still get PO740 in D5 at over 60 MPH.

I think next step is test and possibly replace TCC solenoid. Problem is (aside from the fact I know virtually nothing about transmissions) I don't know which of the half dozen tranny solenoids is the TCC solenoid.

There seems to be a pair each of "A" and "B" solenoids, two "linear" solenoids and a "shift" solenoid. If anyone can help steer me to the correct solenoid I would appreciate it. Or if you think I'm barking up the wrong tree and the problem may be something else, I would appreciate that feedback as well. Thank you in advance for any assistance.
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Old 06-11-2012, 03:55 PM   #2
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Ya I had this too a few months ago. Thank God the shit just disappeared on its own. hah (yes i realize that's the dumbest shit anyone could say).

post back if you ever resolve your issue though.
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Old 06-11-2012, 04:19 PM   #3
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Code says torque convertor solenoid signal malfunction

I got that same code the other day, but after i did a 3 quart drain fill, cleared the code and it came back the next day, i was already going to put in a cooler, so i let it be because everything was driving fine, i put in the cooler and did another drain fill, with the cooler i added 6 quarts, its been driving perfectly fine, whether it is aggressive or normal.


I didnt think too much about the code because i only got the code when my ivac acted up, and i had reset the car to relearn, but its been driving perfect
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Old 06-12-2012, 12:49 PM   #4
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My 2001 tl did the same thing and I ordered the control solenoid. Its was $250, killed my pocket but it had to be done and now my car shifts great again and the tcs light has gone off.
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Old 06-12-2012, 02:06 PM   #5
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Nike1993 - Can you tell me the location of the control solenoid you replaced, say in reference to the dipstick tube? Thanks for your reply
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Old 06-18-2012, 01:04 PM   #6
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The control solenoid is on top of the transmission, under the intake tube and you have to remove the battery and battery plate to actually see it.
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Old 06-18-2012, 01:49 PM   #7
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Typically when that code comes up its a short time before failure.
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Old 06-18-2012, 06:52 PM   #8
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Wiseman once say:

Welcome to Acurazine!

Your transmission is fucked!!!
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Old 06-18-2012, 09:18 PM   #9
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It's one of the two on top of the transmission. It has a black connector.

I had these out on my daughters 2002 TL and it was a real pain getting the small
bolt that holds that one back in.
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Old 01-23-2013, 04:40 AM   #10
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Quote:
Originally Posted by yungone501 View Post
Wiseman once say:

Welcome to Acurazine!

Your transmission is fucked!!!
Isn't replacement fairly easy?

How expensive is it to replace a TTC? Mine just failed recently, smells when I drive it on the highway.
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Old 01-23-2013, 06:52 AM   #11
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Isn't replacement fairly easy?

How expensive is it to replace a TTC? Mine just failed recently, smells when I drive it on the highway.
You have to remove the trans to replace the TQ converter. Typically when that code comes up the trans it self is failing.
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Old 01-23-2013, 09:41 AM   #12
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You have to remove the trans to replace the TQ converter. Typically when that code comes up the trans it self is failing.
Well you see, I just rebuilt my transmission at 180,000km, about 2 years ago. Now at 214,000km my Solenoid broke. If my transmission needs another rebuild I'll be pretty damn annoyed. It's at the shop today, I'll get a quote later on.

Is there a long term solution for this problem? Are there aftermarket torque converters which are more reliable? Are standard TL's susceptible to the same problems?
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Old 01-23-2013, 09:45 AM   #13
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Hey man, just go out and find an '06>'07 Accord tranny and you'll be better off !
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Old 01-23-2013, 10:00 AM   #14
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Quote:
Originally Posted by fsttyms1 View Post
Typically when that code comes up its a short time before failure.
Yep.. I can concur. I had this error come up twice on me, I simply cleared it and didn't think anything of it as my tranny was shifting fine up until the day it just simply decided to crap out on me.

So be very careful!!!!

Edit* BTW Kris, AOKP > CM
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Old 01-23-2013, 03:26 PM   #15
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i had that same code, and shortly after 2 weeks of driving transimission crap out wont change gear from 2nd to 3rd but fromt 1st to 2nd it will high rev...its best if you just replace the tranny or rebuild it...had mines rebuilt which cost me 2500 bucks felt like i got ripped off by the shop and they stole my system....smfh hope you get your problems fix asap.......
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Old 01-23-2013, 03:41 PM   #16
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Quote:
Originally Posted by fsttyms1 View Post
You have to remove the trans to replace the TQ converter. Typically when that code comes up the trans it self is failing.
I agree start saving up, when I first got the code I drove for a year or two before it finally failed. Most only last a few weeks.

Quote:
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Hey man, just go out and find an '06>'07 Accord tranny and you'll be better off !
Exactly find a low mileage 06-07 Honda accord v6 transmission.
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Old 03-16-2013, 05:59 PM   #17
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got a pro too

I had my engine mounts replace yesterday n as I'm pulling out of the shop I notice my shifting gear hard, a few blocks later the engine light came on. I drove home slow as possible and the next day got the code read. = po740. So I popped the hood to take a look and the solenoid is broken!
What do I do..?
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Old 03-16-2013, 06:24 PM   #18
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Question Broken solenoid....?

Hey TL99sincere, hey man ...... gotta say that seems rather strange !

So, this happens right after the shop replaced your mounts ? Hmmm.

Sorta makes ya wonder a bit, huh ? Do ya trust these guys ?
Personally, I don't understand how a solenoid could be obviously broken, unless it was tampered with. Just my opinion, mind ya.
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Old 03-17-2013, 07:23 PM   #19
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I know, i think he not have placed the breaker bar there by mistake, or he raised the motor to high n it pressed against the battery, (it was not removed durning
install) the place is a friend of a friend that just opened a shop. I figured I would try him out and this is what happened. I spoke with the mechanic today and he said we will order the part and swap it out. I figure I'll park it up till he replaces it. Hope and praying
that all it is...
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Old 03-17-2013, 09:31 PM   #20
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Quote:
Originally Posted by yungone501 View Post
Wiseman once say:

Welcome to Acurazine!

Your transmission is fucked!!!
Hehehe, I'm a wiseman now yaay
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Old 03-18-2013, 08:55 AM   #21
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Cool Wiseman

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Hehehe, I'm a wiseman now yaay

Hey Karanx7,
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Old 08-19-2013, 09:36 PM   #22
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Just had this code come up with my CEL....

So I guess i'm waiting for the inevitable failure of my transmission
Should I even replace the solenoid? I'd be pissed if i spent money to replace it and the whole thing just gives up on me anyway.

Any suggestions as to what I should do...
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Old 08-20-2013, 06:49 AM   #23
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Start researching the '06>'07 Honda Accord's V-6 AT for a donor replacement.
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Old 08-20-2013, 07:12 AM   #24
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Same code came up in mine bought 2 solenoids one a used one off ebay. They are both still sitting in my garage and also a case Honda dw-1. Hindsight being 20/20 wish I had put that money towards a new transmission.

Your Options;
~06/07 transmission
~remanufactured from honda with the new torque convertor.

Rebuilds=another failure down the road. In my opinion.
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Old 08-20-2013, 12:37 PM   #25
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yea my friend who is a honda mechanic said that the mechanics there that see this come up even if they changed solenoids, the tranny will still fail.

Would you think it would be worth it to drop in an 06/07 transmission? Or would it be better to spend money on a cheap used car for the time being?

How much does it generally cost to swap a transmission?
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Old 08-20-2013, 12:50 PM   #26
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Call around and get at least five estimates. Talk to a boneyard and see how much a low mile 06/07 honda accord tranny costs.

Note: Do not rebuild. Replace!
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Old 08-20-2013, 01:32 PM   #27
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My TL 2003 I was like, out of order two pressure transducers, changed and everything was fine.


http://www.hondapartsunlimited.com/p...ensor-solenoid
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Old 08-20-2013, 07:10 PM   #28
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P0740=Almost certain death to the transmission.
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Old 08-27-2013, 11:47 AM   #29
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Quote:
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Call around and get at least five estimates. Talk to a boneyard and see how much a low mile 06/07 honda accord tranny costs.

Note: Do not rebuild. Replace!
Will that tranny fit perfectly in our car??

Got the call this morning from my dad (since we traded cars for the time being) my tranny failed.
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Old 08-27-2013, 01:34 PM   #30
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I put in a Honda remanufactured with the new torque convertor.

06/07 Honda accord tranny seems to be the best bet=more reliable.
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Old 09-10-2013, 08:49 AM   #31
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Angry P0740 TCC Solenoid Circuit

I had the tranny rebuilt on my 2000 TL about 60 days ago. They (according to the bill) replaced the TCC and the linear solenoids. Car still shifts OK, but occassionally at low speed seems to hang in neutral before kicking into gear. Fluid is brand new and full.

I just spent $3k on this rebuild....ideas?
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Old 09-10-2013, 08:50 AM   #32
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And I have the P7040 TCC Solenoid Circuit code from the Check Engine Alert....
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Old 09-10-2013, 10:34 AM   #33
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They obviously didn't do a good job. Send it back and tell them the problem and they should fix it.

Not cool to have it repaired after it was repaired, but it is repair shops responsibilty to fix it the right way.
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Old 09-10-2013, 06:19 PM   #34
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Yeah, as Nicks2001tl said....60 days and paying $3000 for a rebuild means that the shop owes ya a followup and make things right. IMO.

Did ya get a warranty on the work ? Sure hope so, as ya need to use it right now and possibly again down the road.
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Old 09-11-2013, 10:33 AM   #35
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Quote:
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I had the tranny rebuilt on my 2000 TL about 60 days ago. They (according to the bill) replaced the TCC and the linear solenoids. Car still shifts OK, but occassionally at low speed seems to hang in neutral before kicking into gear. Fluid is brand new and full.

I just spent $3k on this rebuild....ideas?
My idea is this: The design on these transmissions is bad and almost always results in failure. When you get a rebuild, you aren't fixing the poor design, only replacing what was bad. That having been said, I'm not surprised at all that it failed.

Never get a rebuild because it will fail almost exactly the same way. When you go into the shop ask them if they drilled a hole from line to converter charge on the main pressure regulator valve body. My guess is they didn't. They probably also over torqued the bolts on the valve body by using an impact wrench.

Last edited by Yikes; 09-11-2013 at 10:44 AM.
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Old 09-17-2013, 02:17 PM   #36
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Hi everyone in the room,

My Acura also have this code PO740, can someone post the picture of the TCC SOLENOID? then where can i get it from?
Thanks
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Old 09-17-2013, 04:11 PM   #37
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^^ Seems you didn't read all the way down here bud..

P0740 doesn't actually says: "Your solenoid is toasted need to replace it" well at least not 99.99% of the time.

P0740 says: "Dude! my pal here (Trans) is about to crap itself, Be prepared! I'm just throwing a P0740 because I'm the only smart thing enough inside this transmission to actually notice something is going down."..

Last edited by Skirmich; 09-17-2013 at 04:14 PM.
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Old 09-17-2013, 05:36 PM   #38
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Yea i forgot to mention, my tranny failed... and my dad ended up getting it rebuilt....
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Old 09-23-2013, 11:22 AM   #39
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What do i need to do?
Thank you
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Old 09-23-2013, 02:37 PM   #40
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then then ? Well, at least the part anyway.
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