I had pulled the same code. Long story short it was the torque converter. From what I understand and please correct me if I'm wrong but those two solenoids don't have a signal wire. So when the computer says shift into O/D or lock up TC and it does not see a RPM drop its going to blame the solenoids every time even if the solenoids are working correctly.

Here is the thread

https://dodgeforum.com/forum/2nd-gen...overdrive.html

 

I understand your point John D. The funky thing about 1740 is that there's no single answer to it. It's one of those generic codes that really could be anything.

 

I hear that loud and clear, and in fact, I'm going to call "BS" on myself. I read a half-dozen threads and probably thought I learned more than I did. I read on one of them that the two solenoids (OD, TCC) "shared the same circuit", so the code could be for either one. Now, I wouldn't take that to the bank, having heard that the PCM might just fail to detect the expected change in RPM's and blindly blame both/either/one of them. That does make me wonder how it knows to detect a change in RPM, unless it does indeed "talk" to the solenoids; but maybe all it knows is that the O/D button got pushed.

I did just read that four-page thread on this code, and this really is incredibly complicated. So again, I find myself guilty of bulls***ing, and shall penalize myself by forcing myself to have another glass of Pinot Noir, as I check in on how the Yankees are doing. Thanks for being gentle, and I don't blame you a bit for questioning me.

And all this coming from a guy whose basic response when getting a "Check Engine" light is to pop the hood and say "yup, the engine's still there all right", and drive on.

(But I still say to check all the damn connections).

 

 

VW, I think it's a dark purple, almost blueish. Then again it could be black and I'm having color recognition issues.

John D, that avatar had the glitch when I got it. I was disappointed too.


Is the TCC or OD solenoid tied into the speedometer/tachometer in any way? The reason I ask is because when I turned it off I was going up hill and doing about 50mph and I hit the brakes to turn about 2 seconds after hitting the o/d off button so the rpms didn't change much if any.
If the pcm is supposed to register a much bigger increase in rpms at a given speed when the o/d is turned off manually but doesn't because the truck is going uphill (and has the resistance of the hill slowing the truck down already) then is it possible that I just happened to hit the button at just the right time to make the pcm get a reading outside of its parameters?

 

PCM controls the solenoids individually, it also knows what RPM the engine is turning at. When it engages either solenoid, it EXPECTS to see an rpm drop. If it DOESN'T see one, it will set a code. Now, it is truly unfortunate that since the PCM knows which one it is whining about, that it WON'T TELL US. We get a generic code for either/both. nice huh?