EChristopher

My 01 XJ Sport threw a P0740 code the other day - I had been noticing some "stayling too long in low gear" performance over the past month. Needless to say, ENGINE light is on and I don't want to disrespect it. Can it really be that the TC is shot after 70k? I bought her at 67k so she's new to me but none of the XJs I've had in the past encountered this (despite impressive mileages achieved). Honestly, I don't mind spending money on her but I thought I would throw this a "post" before taking it to a shop. Any thoughts from related experiences would be greatly appreciated!!

Eric

jarretthise

Yeah there's a chance the converter could be shot.. Any leakage? Any problems with od? Does it feel like your line pressures aren't right while downshifting?

EChristopher

There HAS been a little leaking and the tranny doesn't seem to downshift as I would expect when climbing hills. Honestly, this is the first auto-tranny I've ever owned (in any vehicle) and I've never had to contend with a TC. I'm familiar with replacing clutches but this is a different animal to me - curious as to what I'm getting in to. Thanks for taking the time to answer. Any further advice is appreciated...

warthog

I believe that was the same code i had when my tranny stayed in a lower gear and threw a light and code. I was convinced nothing was wrong so i i got under the jeep and saw the only connection i could find easily on the left side of the tranny. diso'd, cleaned and reco'd it and the light went away and i have not had a problem since. hopefully this will help in your situation

milmat1

The torque converter is a Fluid Coupling !.....
http://en.wikipedia.org/wiki/Torque_converter

EChristopher

Thanks for the replies - everyone! I took it to a very trusted repair shop (that is a fan of Jeeps i should add) he reset the light and could find no flaws anywhere after going through the checkpoints. Told me that the tranny fluid must have been recently changed because it looked clean and new - insisted on charging me nothing and said to bring it back if the light repeats. Maybe just a fluke? Who knows, but I will keep a close eye on things - sure love this little tank!!!

E

warthog

Good, mine did the same thing, not sure if it fixed itself or removing and reinstalling that plug helped

mh_jenkins

1999 Cherokee sport 4.0 here at 121K miles. I am getting P0740 and P0700 codes. Replaced the transmission filter and about 75% of the transmission fluid. The automatic transmission now shifts much smoother but still getting the codes. I will try what you did about cleaning the connection and report back.

Frugal

Mine did the exact same thing last week while I was traveling, not the perfect time to see the big bright check engine come on. Anyway I crawled up under the jeep and wiggled the connectors around on the tranny and it went away. Now if all the other little problems it has can be fixed as easy

EChristopher

The problem eventually returned. It was an easy fix - turned out to be the throttle position sensor. The part was fairly cheap and it has run perfectly ever since it was replaced. There is a lot to be said for starting with the simple things before assuming the worst....

cpefy3

I know this is an older topic, but I just want to ask a couple of quick questions. I also have a 98 Cherokee with a straight 6 and 31x10.5 and am receiving p0700 and p0740. The codes seem to come and go in an irregular nature. It sometimes seems as if it doesn't want to switch into overdrive.

1.) Could Larger tire size account for this code. I know it may seem silly just not sure if the vehicle reading the wrong speed and it not matching up with the rpms may cause this.

2.) Is there a test for the TPS before purchasing a new one. I know the previous poster said this fixed their problems, but I do not believe that I am having any other TPS issues such as dying or won't go into reverse.

Thanks