2014 Ram P0740

[Jlbaker114]

I have a 2014 6.7 with the 68RFE.. I’m getting the p0740 code, I can shut it off and it’ll come back on around 75-100 miles. Yes it’s deleted & tuned. Has a raceme ultra tuner, (I don’t know much about it, it has been on the truck since I purchased it.) Trans isn’t running hot, I checked/changed the fluid and filters, the fluid was clean, no metal in the pan . It has around 140k miles. I’m not sure where to start with it. Thank you for any help!

 

[p-Bar]

A lot of guys have always said to put back to stock and see if your having the problem. Your stuck with not being able to do that. I'm sure some other guys will chime in . Good luck

 

[p-Bar]

From transengineer

P0740 is Torque Converter Clutch (TCC) Out of Range, which means that when your TCM commanded the TCC to fully engage (lockup), it was unable to pull the engine speed down to turbine speed. If it fails three times in a row, it sets this fault.

This fault simply disables the TCC. You can continue to drive the truck without much problem, as long as you're aware of one critical point: Lack of TCC engagement will negatively impact trans cooling. You will be generating extra heat in the converter all the time (instead of only at slow speeds, as in normal operation). You can overheat the trans if you drive for an extended period, especially with a trailer. So I would NOT advise any trailer towing until you get it fixed. Short trips are OK, but no cross-country treks without some stops to cool off.

The problem (causing P0740) can be in a number of areas: internal converter failure, stuck TCC control valve (in the rear half of the pump), bad control solenoid, bad wire or wiring connection, etc. Typically, if the solenoid is bad (or the wiring) you will also set other faults, so if P0740 is all you've got, then my first bet would be internal converter, or sticky valve in pump. For the repair you typically pull the trans, pull the pump, and inspect the valves. If valves are stuck, clean 'em. If still bad, replace pump assy. If valves are all OK, replace converter.

You might want to first take a ride with a dealer tech (with a scan tool) after clearing the fault, to see what happens when the TCM first commands TCC engagement. Does it try to lockup but can't quite pull it down far enough? Or do you get no response at all? Sometimes that will help to diagnose the root cause.

 

[Topzide]

Dealer techs may not touch due to being deleted truck! That's the problem with a deleted truck is that a shop that works on it face fines and many other issues now. Not sure if you can UN-delete the truck or not. The EPA is really cracking down on this issue no matter where you reside. Good luck, hope you're good with tools.

 

[Jim W]

I haven't visited a dealer since 2009, on my truck. If the truck requires service that I can't do I have used a very competent service garage. Never had an issue with them working on my truck.

I can't see where the service garage would get in trouble for working on a deleted truck since they are not deleting anything.

 

[Topzide]

https://www.thedrive.com/www.thedri...ty-diesel-truck-on-facebook-and-yes-they-know
https://www.epa.gov/enforcement/xtreme-diesel-performance-llc-clean-air-act-settlement
https://www.northeastdiesel.org/tampering.html
These are just some of the issues. Once a truck has been deleted, it is an off road vehicle only. Any repairs made to keep on the road violate the EPA clean air act. The shop is at risk of being fined when a tagged vehicle comes in for service. This is JM2C.
This poor guy got sold a deleted truck and it's a can of worms for both the seller and buyer, https://www.turbodieselregister.com...ul-mode-and-engine-brake.273068/#post-2704416
That's why I say good luck. Any reputable shops are now being careful about this as not worth having the state or FED's come snooping around you business! Then fine or revoke you business license! Do what you want, but be aware of what is going on.

 

[Jlbaker114]

A lot of guys have always said to put back to stock and see if your having the problem. Your stuck with not being able to do that. I'm sure some other guys will chime in . Good luck

Thank you very much for your help! I have to get my tuner fixed, unfortunately the port on the back of it for it to get power is messed up and it won’t get any power. So I can’t set it back to stock until I get it working.

 

[Jlbaker114]

From transengineer

P0740 is Torque Converter Clutch (TCC) Out of Range, which means that when your TCM commanded the TCC to fully engage (lockup), it was unable to pull the engine speed down to turbine speed. If it fails three times in a row, it sets this fault.

This fault simply disables the TCC. You can continue to drive the truck without much problem, as long as you're aware of one critical point: Lack of TCC engagement will negatively impact trans cooling. You will be generating extra heat in the converter all the time (instead of only at slow speeds, as in normal operation). You can overheat the trans if you drive for an extended period, especially with a trailer. So I would NOT advise any trailer towing until you get it fixed. Short trips are OK, but no cross-country treks without some stops to cool off.

The problem (causing P0740) can be in a number of areas: internal converter failure, stuck TCC control valve (in the rear half of the pump), bad control solenoid, bad wire or wiring connection, etc. Typically, if the solenoid is bad (or the wiring) you will also set other faults, so if P0740 is all you've got, then my first bet would be internal converter, or sticky valve in pump. For the repair you typically pull the trans, pull the pump, and inspect the valves. If valves are stuck, clean 'em. If still bad, replace pump assy. If valves are all OK, replace converter.

You might want to first take a ride with a dealer tech (with a scan tool) after clearing the fault, to see what happens when the TCM first commands TCC engagement. Does it try to lockup but can't quite pull it down far enough? Or do you get no response at all? Sometimes that will help to diagnose the root cause.

I have driven it to work a good bit since the initial CEL for it and my trans temp doesn’t usually get to hot. Nothing over 100 degrees above ambient temp. (It’s about 45-60 degrees here right now.) I also only pull a side by side and small trailer if I pull anything right now