shanelsl88

I'm getting a code P0740 torque converter solenoid circuit does any one know where this circuit is, how much and how hard to change? PLEASE HELP!!!

shanelsl88

[QUOTE="shanelsl88;2601704"]I'm getting a code P0740 torque converter solenoid circuit does any one know where this circuit is, how much and how hard to change? PLEASE HELP!!! 2001 Jeep Grand Cherokee Limited 4.7

5-90

1) "Bumping" your own post is generally frowned upon. You may be in a hurry, but it clutters up the boards. (If you're in a hurry, I can feel your pain. But, it can result in getting in your own way.)

2) "Torque Converter Solenoid Circuit," I believe, will refer to the TCC solenoid, which is fastened to the valve body, which is inside the transmission (you just need to remove the sump pan.) However, know that it's not necessarily the solenoid itself - it could be the wiring leading to it from the TCU (Transmission Control Unit.) Have you wiring diagrams?

Fortunately, the failure of the TCC isn't necessarily a "driveability" issue. You'll lose some fuel mileage (not much - 1-2mpg, probably) because the lockup of the torque converter can't happen, but that's about it.

(A torque converter is a fluid coupling between the engine & transmission - it's what lets you sit at a light in Drive with your foot on the brake, for instance. Being a fluid coupling, there is always some "slip" involved - maximum coupling efficiency is usually 90-95%. The "clutch" in the later torque converters - like yours - allows the torque converter to "lock up" and become a solid mechanical coupling.

(The TCC is available at a steady-state cruise in third or fourth gear ranges, and is generally not noticeable, except when your tach drops slightly when you cruise - the engine speed drops about 200rpm or so.

If you haven't a service manual, get one. A Chilton's manual is acceptable and useful (especially for the neophyte,) but you'll eventually want to find an FSM (Factory Service Manual.) These can usually be found secondhand for a decent price, check eBay and the "For Sale" sections of Jeep boards.

Good luck!