Torque converter locked at idle??

[HookMeUp]

I had the strangest thing happen today. After starting up and leaving the neighborhood and coming to a stop at the traffic light, it seemed that the converter was locked up because I couldn't get the truck to stop! I had to shift it into neutral in order to stop. After that everything worked fine. Is this unusual or has this happened to anyone else?

 

[AllianceDiesel]

I have one customer that had it happen on his 09 a couple times but would only do it right away in the morning when first put into gear. Ive heard it is in the valve body but I couldnt find any problems.

 

[transe]

Actually the issue is likely caused by a defective filter. Usually it's the spin-on filter (having a weak anti-drainback diaphragm that allows oil in the converter to drain back into the trans sump when the truck is shut down overnight). But could also be the main sump filter: either the snout is dislodged from the seal in the pump (snout should be pushed up through the seal), or filter could be split open along its side seam. So I would drop the pan, check the main sump filter (the flat one), and if it's OK then replace the spin-on filter (use a Mopar filter) and that should take care of it.

 

[HookMeUp]

Thanks. I will try changing the filters changed out. It's cold out and I don't have an indoor place to change them out, so I will need to take it to the dealer.

 

[HookMeUp]

I took the truck the into the local dealer about this problem and got a call back from just a few minutes ago. They said the problem is the fuel pressure actuator and a clogged crank case filter. They explained the actuator controls line pressure in the transmission. Doesn't sound right, but both are covered under warranty.

 

[DonFitzwater]

I bet that's not the problem!!!!

 

[AllianceDiesel]

Uhhhhhhh no

 

[Ozymandias]

Yeah, but he gots new stuff for free. Sweet.
Next time he walks in he has to pay for the Trans Filters.

 

[transe]

Well, part of their theory may be correct. The trans line pressure IS controlled based on engine torque level, and that may well be tied to (or at least correlate with) this fuel pressure actuator (I don't know, but it sounds plausible).

Having said that, the Torque Converter Clutch (TCC) should NOT be locking up at all in 1st gear, so I don't care what the commanded line pressure is doing, it would not cause the TCC issue. TCC drag at a stop is usually caused by an interruption in line pressure (momentary loss of line pressure), not by a commanded reduction in line pressure. So I would be surprised if changing the fuel pressure actuator and/or crank case filter (what is that, anyway?) fixes it.

 

[HookMeUp]

crank case filter (what is that, anyway?)

I think they are referring to this:
http://www.genosgarage.com/CUMMINS-CV52001-CRANKCASE-VENT-FILTER-075-15-67L/productinfo/CV520010/#.VPOX9Xl0zmE

But I don't see how that is related at all.