I got a P1740 on the way home earlier. It came on right after I hit the overdrive off button to slow the truck down a little right before I turned. I felt the shudder that it does when you turn off the overdrive while coasting at about 50mph then turned and the only indication of a problem was the CEL. So can this code pop up after turning off the overdrive when there isn't actually an issue or am I going to be working on my transmission soon?

 

P1740 TCC or O/D Solenoid Perf

Coincidence methinks. Clear the codes, see if it comes back. My guess is: No.

 

When I got this code, I never got a chance to figure out the problem. I had to rebuild my tranny, so no more 1740. I was, however, always under the assumption that is was the TCC. Sorry I don' have your answer.

 

Hopefully it was a coincidence. I cleared the code and took it for a 14 mile ride and it seemed to be as it should be.
I got the transmission rebuilt 17,000 miles ago and it got a new torque converter with the rebuild, forgot to mention that.

 

If it has a warranty take it to the transmission shop that rebuilt it.

 

It was just a one year warranty and it's been out for a while now.

 

What color is the truck? Yes, this makes a difference.

 

And do you know the capital of Sumer? This also makes a difference.

OK, so here's my 5 cents (inflation, you know):

I don't think it's a coincidence that you just happened to get a code right after using the solenoid that the code is for. Could be that it's binding a little, drew more power than the computer thinks it should, and that set off the code. Could be as simple as taking it out and seeing if it seems to be binding when you put 12 volts to it. Maybe a little grease is in order.

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From another forum:

"I had that code, replaced the solenoid and it turned out to be the connector on the solenoid....double check the connector first as it is way cheaper than buying a new solenoid!!"

http://www.dieseltruckresource.com/d...e-t235108.html

Maybe the computer is momentarily losing communication with the solenoid due to a sketchy connection; that plug is in a hostile environment, might just need a cleanup.

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Sherriff, your animated GIF is acting up, prematurely terminating about 1 second too soon.

 

Would you mind explaining that further? The issue I have with that statement is that the TCC is always in use (turned on and off) when it's going from 3rd gear to overdrive. So why would it F up when sheriff turned it off? I'm just trying to understand your POV.

 

Here's what led me to make that statement, with the disclaimer that I don't know a TCC from the FCC. When Hey You said the error code meant "TCC or O/D Solenoid Perf", I made the assumption that the overdrive solenoid is the solenoid that engages and disengages the overdrive. That's about the whole story.

And it still doesn't sound like just a coincidence that the code came up right after shifting.

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Interesting TSB, pertaining to, among other vehicles, 2000-2001 trucks:

TSB 21-11-00

"The customer may complain of a Malfunction Indicator Lamp (MIL) illumination. Upon
further analysis, it is determined that the MIL is caused by Diagnostic Trouble Code (DTC)
P1740 - Torque Converter Clutch (TCC) or Overdrive Solenoid Performance. Other than
the MIL, the customer may not notice any other condition with the transmission.
This condition may be caused by an intermittent and momentary TCC disengagement
condition. The transmission valve body pressure boost valve cover plate has been revised
with a larger size orifice hole to address this condition".

I do get your point though, that both solenoids can be involved in a disengagement of the O/D. I do stand by my opinion that the O/D solenoid will always be involved, while the TCC solenoid probably isn't always.