Does anyone know what this is ????

 

all set turns out its a tranny code that needs to be reprogramed/flashed.
I disconnect the battey and the lite is gone no need for flash for now

 

Before paying for a flash for this, I'd want the dealer to show me the TSB that prescribes the flash for this problem. Actually, if you'd like to tell me your model year I can check for any TSB's for you. Personally, I suspect that there is no TSB andit is the dealer padding their bill with an unnecessary flash reprogramming. (The flash takes about 10 minutes and they usually bill an hour for it.)

P0740 sets when the vehicle is travelling over 50MPH with the throttle at less than 10% for a sufficient period of time. Those are the driving conditions necessary for torque converter clutch lock-up. The converter clutch is a clutch that locks your engine output to your transmission input for addedfuelefficiency when the vehicle is cruising. If the computer commands lock-up and detects a difference between engine output RPM and transmission input RPM that is greater than 60 RPM's the code sets. In other words, it sets because the converter clutch is not locking up. That usually means the torque converter needs to be replaced. Unfortunately, that means removing the transmission and is pretty expensive-- just the same, you don't want to pay for an unnecessary flash reprogramming on top of that.

When this happened to my wife's van, it was about 2 months before I could get around to changing the converter clutch, so I just turned off the light with my scan tool when it came on so it wouldn't be too annoying. The light stayed off most of that time because my wife mostly just uses the van to run the kids around town at 40mph max. Whenever she took a 20 minute trip on the highway though, the light would come back on because the conditions described above were met.


Oh-- one more thing. Don't let anyone talk you into replacing the solenoid valve pack for this. If your transmission is running smoothly, that is definately not the problem.

 

OK, I checked and there are no TSB's for 2001-2007 minivans prescribing a flash to correct a P0740. Don't waste your money on that.

 

Check engine light came on over two years ago. Codes po700 & po740. All tranny shops told me a new tranny was a must. Van shifts like it did the day I bought it. Not buying the need for a new tranny. I pulled the pan, found a pinch of clutch shavings, nothing rare for 96k, Did fluid, filter, and a dose of lucas stop slip and conditioner. Deleted code, took it out on the town and drove it hard. Light came on several times over a two week period, kept deleting it. I had the dealer reflash the shift control module for 99.00, No light and the tranny shifts like new. Worth a try.