Question about Dodge Ram 2500

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I have a 2000 Dodge Ram 2500 Pickup throwing a P0740 and a M080 fault code. I took it to a transmission shop. The transmission pan and fluid look good. They can't believe it would be a torque coverter. They told me that they changed the solenoid and re-set the computer. What else could it be????

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Mitchelldiy online is a site you can go to and for ten bucks you can get all the diagnostic procedures so you can see what the tech is dealing with. There are 7 possible causes and the diagnostic procedures are available if you would like to see them.

1. Misfire detected
2. Faulty TCC solenoid
3. TCC shaft seal leaking
4. Trans fluid contaminated
5. TCC wiring harness defective
6. TCC defective
7. TCC hydraulic circuit damaged

Posted on May 12, 2010

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That code P0740 indicates a problem with the CIRCUIT of the torque converter clutch i.e. malfunction of the circuit. So I would follow the wiring as far as you can.

Posted on May 12, 2010

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Code P0740 - Torque Converter Clutch Solenoid Circuit

This if refer to "relationship between engine speed and vehicle speed indicates no torque converter clutch engagement". The code is basically telling you that the converter is not locking up at high rpm and speed as tightly as it should, i.e. some slippage, which simply means a slight loss of fuel economy.

The trouble shoot for this code points to the following steps before concluding the need to replace the torque converter clutch (not necessarily the entire torque converter but just that part, which I believe none the less requires removal of the trans. fluid level OK? electrical connectors?

Do shift lever test verify flash level of trans controller for need to upgrade the software check for technical service bulletins that might apply drive the van and see if the torque converter clutch will engage (you should note the rpm drops about 5% when you pass through the speed of about 40-50 mph, and feels like a slight decrease in the overall gear ratio) if it does, then try wiggling the wires and check for shorted circuits. if the clutch doesn't come into play then do a hydraulic pressure test on the trans on the basis of that test decide what needs to be done.

I might mention that the lack of a torque converter lock up capability just means that you would lose about 5% in the mpg figure on the highway as compared to if it worked. There are many vehicles than don't have this feature. This malfunction will not meaning fully affect the function of the transmission just the marginal affect on fuel economy it is probably not going to be a repair that is worth it to you. It can be repaired later when the trans suffers an inability to shift properly or even to drive the van which commonly requires a total rebuild. The clutch for the torque converter is purely for gas economy."

Posted on May 12, 2010

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P0740 = Torque converter clutch CIRCUIT malfunction. Actual nomenclature: P0740 (M) Torq Con Clu, No RPM Drop At Lockup Relationship between engine and vehicle speeds indicated failure of torque converter clutch lock-up system. (TCC/PTU sol)

If you get the P0740 code it means there is a problem with either the torque converter or the control system for the torque converter in your truck.
It might be such a slight problem that you don't notice anything, or it may be totally un-driveable. It depends on what part of the system failed and how badly it failed.
To fix it, it can be anything from a simple fluid and filter change (to get debris out of the fluid that might be clogging the solenoid up), or it could be an electrical problem (such as the solenoid, or wiring) or it could be the torque converter itself has failed (which would mean the entire transmission is likely ruined from the debris).
It IS definately a difficult problem to diagnose, and impossible to diagnose without taking anything apart (or at least test driving it with some diagnostic equipment).
Starting with the basic (inexpensive) stuff like a fluid flush and filter change and working your way up from there is usually the best way to go, as long as the truck is still driveable.
The lockout solenoid is a likely culprit. Reset the code, and see if it comes back. If it stuck one time - the code is set.... even if it is working properly now.
As far as fixing the actual problem goes, I'd start by checking that you have power going to the sensors and solenoids in the valve body (I'd bet you do) and that the ECU is grounding the wires for the OD and lockup solenoids. If both things are happening, then I'd replace the solenoids and see what that does for you.

In most cases it a failing converter, no lockup. It sets this code because it doesn't have a code for "no lockup".

When converters fail in these trucks they also clog the cooler in the radiator, this can cause major gear train failure due to lack of lube.

To check to see if the cooler is restricted, remove the rear cooler line and crank vehicle, you should have at least one quart in 20 seconds coming out of the line.

Start with the fluid flush and change, and new filter... Reset the CEL and cross your fingers :)

Thanks - BTW... not familiar with any ??M080?? codes.

Posted on May 12, 2010

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2 Answers

I have been getting the code p0740 it says something about the torque converter clutch circuit. it doesn't seem to be going into over drive. dose anyone have any suggestions I can try.


On some cars, there is a TCC solenoid in the transmission which can be replaced by removing the bottom pan. In some cars this solenoid can't be accessed without major disassembly.

Jun 04, 2015 | Cars & Trucks

2 Answers

2001 Chrysler 300 M code P0740


Possible causes of this code are: - Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness is open or shorted
- Torque converter clutch solenoid valve circuit poor electrical connection


Read more: http://engine-codes.com/p0740_chrysler.html#ixzz32x3c6mOw

May 27, 2014 | Cars & Trucks

1 Answer

How hard is it to service a transmission


It is not too hard, drop the pan and replace the filter. The job is messy and you can only get SOME of the fluid changed.
I really like the T-tech flush, from lube shops. This changes fluid by installing new until clean comes out, it gets the radiator, torque converter and lines...

Nov 02, 2010 | 2004 Dodge Ram 2500

3 Answers

Dodge trouble code P1740 is frightening after reading some of the forums. what is the cheapest way to come to a conclusion before changing the transmission? as far as your expertise go.


I have had vehicles with that code before, and I always find that the governor solenoid, and the governor pressure sensor, both have tiny mesh filtering screens around their fluid intake ports to protect them, and I usually find that they are plugged up completely with fine metal shavings. The transmission governor solenoid and pressure sensor are located next to each other under the transmission oil pan, and are located just rear of the transmission valve body.

That repair will depend on how much other damage the transmission really has (if there is a lot of friction material, or metal fragments in the bottom of the transmission oil pan, or the transmission fluid is dark and smells like a burned up clutch or brakes then the transmission will require more extensive repairs) and the repair could last for just a few days or years depending on the condition of the transmission, and it would be a good idea to change the transmission oil filter if you remove the transmission oil pan. Let me know if you require any further assistance.

Jun 16, 2010 | 2000 Dodge Ram 1500 Truck

1 Answer

When changing transmission pan gasket and filter, how many quarts of fluid will i replace


Which engine does your truck have?? Most passenger type trucks/cars today are in the 5-7 quart range when you do a drain/refill filter change.

I recommend using the OEM fluid as well or at least one approved by them. Transmissions can be really fickle about what fluid goes in them.... to the point of operating so poorly that some shops would replace/rebuild them when all they need is correct fluid.

Apr 18, 2010 | 2001 Dodge Ram 2500 Truck

1 Answer

Dodge Ram P0740 and PO304 codes just bought it.


the dealer needs to find out the codes and from the codes they should know what the problem is, and then should manage to sort the problems from there,

Jun 06, 2009 | 1998 Dodge Ram 2500 2WD

1 Answer

Trouble code P1740 on 1999 Dodge Ram 2500


I had the same code on my 2001 dodge 2500. The truck wouldn't shift from 3-4. I pulled the trans pan off and replaced a broken spring ($2.00). It is behind a thin plate with 3-4 small torq screws. You don't have to remove the valvebody. Only took me 45 minutes to fix.

I would like to give thanks to Jeff Russel from Teal automotive. He said this is a very common problem. He sells any part for any automatic Transmision and his prices are very affordable.
Here is a link to the website.
http://www.tealautomotiveinc.com/

Hope this helps.

Mar 15, 2009 | 2004 Dodge Ram

1 Answer

1999 Dodge Ram 2500 4WD, Transmassion will not up shift.


Sounds like a problem i had on my 96. but, check the muffler.If the KAT converter is pluged , it wont shift into 3rd, at 45mph. Witch the OBD and 3 techs couldnt find.This unit only cost me $100.00.Better than 2 grand. Let me know.

Oct 29, 2008 | 1999 Dodge Ram 2500 4WD

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