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-   -   P0740 (http://www.wranglerforum.com/f282/p0740-72950.html)

wranglernut 12-21-2010 05:49 PM

P0740
 
Hey friends, I've had the torque converter code for a while now, finally took it into the shop to see if it was the wiring, solenoid, or actual torque converter that's not working. The guy hooked up the scanner, took it for a spin, came back and said: "the electrical components are telling the converter to work, but nothing's happening". I said "so the torque converter is not working?" He said: "well we can't tell... We'll need to take the whole thing apart... $1200." I think this sounds slightly suspect. Any thoughts? The transmission works fine other than not locking up the converter on the highway...
This forum is awesome! Some day I hope I'll be able to contribute not just ask for help!! :redface:

JD Adams 12-21-2010 07:50 PM

Very suspect. Take it somewhere else and get another opinion. It should cost nothing to completely diagnose and estimate repairs. Something tells me you went to Midas, or some other hold-em-n-****-em outfit. Head to a dealership instead and see what they say before you open your wallet.

jeepjones 12-23-2010 05:11 AM

Definately get another opinion but not nescessarily from the stealership. I'd go to an actual highly reputable transmission shop. The stealership will make $1200 look cheap.

rrich 12-23-2010 08:26 AM

They guy only looked at his scanner? That makes as much sense as saying you need a heart operation bypass because you won't eat at McDonalds.


First go under it and find the connector on the trans, make sure it's on tight.

And - You can do this with the help of a FACTORY SERVICE MANUAL:

You or a trans shop can unhook the connector and measure the lock-up solenoids resistance from the outside, and power the solenoid by jumpering 12 volts to it. I think you can even pull out the solenoid without removing the trans, but not sure.

The FSM will have a step by step diagnosis AND if needed, the repair procedure. If nothing else, what you'll learn from it you'll be able to tell if a shop is being honest.

wranglernut 12-23-2010 11:18 AM

Thanks for the advice, guys! My FSM is supposed to arrive in the mail any day now, so I'll wait and follow that.

paulj66 02-02-2013 03:59 PM

What was the final resolution to this transmission issue?

wranglernut 02-06-2013 03:18 PM

Quote:

Originally Posted by paulj66
What was the final resolution to this transmission issue?

Well, it's still ongoing- so first observation is that it is nothing vital! (Gas mileage takes a hit though).

I bought a new TCC solenoid but broke it during install- so gonna try it all over again soon. Getting to know the 32 RH though.

Sorry if you we're hoping for more help. Let me know if you have questions- I have taken the valve body off twice now already!

lazermule 10-27-2015 08:10 PM

I know this is an old thread, but was there any resolution here?

I just started getting the code, but I think my TC is still locking up based on the tach reactions on the highway.

firehawkcpo 10-28-2015 11:25 AM

I have the same issue and the trans shop said the same except the price in socal is $800 to replace the tc. I am considering two other options:
1. swap for a manual with another who wants the auto = saves $ on parts
2. replace with this trans and hope for the best
42RLE Transmission For Sale
The price is great but the shipping might over run the budget.
My research indicates that the 42rle is hit or miss regarding reliability and longevity.

lazermule 10-29-2015 08:53 AM

Quote:

Originally Posted by firehawkcpo (Post 22192961)
I have the same issue and the trans shop said the same except the price in socal is $800 to replace the tc. I am considering two other options:
1. swap for a manual with another who wants the auto = saves $ on parts
2. replace with this trans and hope for the best
42RLE Transmission For Sale
The price is great but the shipping might over run the budget.
My research indicates that the 42rle is hit or miss regarding reliability and longevity.


I think I figured mine out, I recently bought the Jeep, it has 170K on it and the trans fluid was a little dirty so I changed it. I read that the trans fluid level could affect this condition and set this code so I double checked my fluid level and it was just a little low. I added less than 1/4 of a quart and no more light. I'll keep you posted if it comes back, but for now it's all good and seems to be functioning well.

firehawkcpo 10-30-2015 09:10 AM

LM,
Thanks for the update. You might consider adding an aux cooler too.

jjabo3 10-30-2015 10:32 AM

I'm having the same issue right now. My transmission was acting a little weird but I changed the fluid and cleared the code but it came back on and everything seems fine. The shop also said it was fine so I'm not realy sure what's wrong.


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