Question about 1999 Jeep Grand Cherokee

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Jeep erradic in shifting

While driving the transmission shifts out of overdrive. Shifts out of third and the torque converter will engage and disengage. The RPM will fluctuate 100 RPM several times and will jump to 3,000 RPM on the open road. The transmission was rebuilt. The tests were done but the transmission is doing what the computer is telling it to do. This does not occur all the time. This jeep has a 318 engine and is full time 4X4. It has 177,000 miles on it. My 1999 Jeep Grand Cherokee Limited was just returned to me after some brake work and now when i accelerate it pauses for a second then goes then accelerates bumby from 1-2 then again a little slower from 2-3 and will not change over to 4th, why?

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Check the adjustment on the brake switch. If the brake switch is not seated properly it will engage when hitting bumps and tell the tranny to come out of overdrive.

Posted on Feb 16, 2009

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I just changed the fluid and filter on my 1993 Grand Am GT, now it only shifts to 2nd gear. I was all working before and the converter clutch was engaging. what could cause this problem?


It sounds like you do have a transmission problem, it is possible that the torque converter is at fault. I would suggest you take it to a dealer that does specialize in transmissions.

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1998 jeep grand cherokee 4x4. have the p0740 code. have to start from neutral, then shifts faily well. May start fluttering and making noise, have to put back to N, then to D and once again will shift. ...


P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

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2 Answers

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You have a short to ground in the internal wiring harness.The first thru third shifts are done hydralicly.The SMEC then applies a ground to the overdrive solenoid for fourth gear and the TCC solenoid for torque converter lockup.

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I have a 2001 base impala and 6 months ago I experienced the same problem. I was driving on the street and all of a sudden my car acted as if it was in neutral. I pulled over and neither of the shifts engaged. The dealership said that my torque converter went bad. Somehow the bad torque converter caused shavings to get into my transmission. They gave me a new torque converter and flushed my transmission. My transmission was almost 2 years old; therefore, it was under warranty.

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I have a 1994 Olsmoblie Cutless Supreme LS, 3.1L V6 , front wheel drive, with 3 speed Torque Converter Lock-out type overdrive transmission. The car drives cold or hot fine until It goes up a hill or can...


First thing,

lets start with a transmission flush and filter change. then have you checked any of your vacume lines. A bad vacume line is the number one thing that causes any form of transmission mis shifting. When it gets warmed up the lines alow cracks to open up and mess up the function of the vacume line. Also you need to have the torque converter checked. You also need to have a computer scan on the vehicle. a bad sensor or coputer could cause any of these problems.

let me know what happens when you check these out.

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Jeep erradic in shifting


I would look into replacing the VSS which is the vehicle speed sensor, it is the input that tells the transmission when to go into overdrive and the torque converter to lock up, also make sure the connector is clean and tight to the sensor, this part is located on the side of the trans where the speedo cable would go.

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