Jeep Garage  - Jeep Forum

Jeep Garage - Jeep Forum (
-   Troubleshooting/Problems (
-   -   codes P0731,P0732,P0734 (

dbear 07-15-2011 10:29 PM

codes P0731,P0732,P0734

I have a 1999 Grand Cherokee Limited with the error codes listed. I'm told that the transmission needs overhauled or the controller is bad.

2005JGC 07-16-2011 01:42 AM

Re: codes P0731,P0732,P0734
I need to go to bed, got to be up early for work all day tomorrow... but when I get home tomorrow night Ill look up what I can and offer whatever suggestion I can.

Frango100 07-16-2011 11:04 AM

Re: codes P0731,P0732,P0734
P0731= incorrect 1st gear ratio, P0732= incorrect 2nd gear ratio, P0734= incorrect 4th gear ratio.
I had only the P0733 and had a worn OD clutch in the tranny.
Seeing this codes, your tranny is probably slipping in all gears and not driveable, right? If the jeep is still driveable, the problem could be an input or output speed sensor or wiring.
Was any maintenance done lately? Did you check the fluid level and smell for burnt fluid? Looks like you have lost the hydraulic pressure in the tranny.
It could be that the tranny pan filter is loose, causing air to enter the pump, or even a pump breakdown or heavy internal leak. I would start opening the pan and check the filter first. If its disconnected, the problem is probably that the filter was installed with the seal, instead of installing the seal first and then the filter.

dbear 07-16-2011 12:30 PM

Re: codes P0731,P0732,P0734
The Jeep is still drivable, it jerks like the u-joints are bad. This condition started all at once. I did change the u-joints when this started. I also checked the fluid level. It did not look or smell burnt.

We were thinking of doing a flush and filter change, but have not done it yet.

We did clear the codes to see if they would come back. It did drive good until the codes came back.

Frango100 07-16-2011 01:35 PM

Re: codes P0731,P0732,P0734
So is the acceleration normal, or do you see that there is an abnormal slip? When it slips, you see a higher then normal engine rev compared to the acceleration.
The codes that where set mean that the TCM (transmission control module) is seeing an out of range output speed compared to the input speed for the respective gear. It could be a problem with one of the speed sensors or the wiring. Due to the intermittent complaint, i would firstly check very well the wiring from both speed sensors for chaving and remove/clean the connectors of both sensors. You will find them both on the LH side of the tranny, one in the front and one in the back. The front sensor wiring on my car is passing quite close to the gear select cable, so could be a place where shaving occurs.
Who told you that the tranny needs a rebuild? Where any tests done?

dbear 07-16-2011 05:31 PM

Re: codes P0731,P0732,P0734
I got on a ask the mechanic web site for Jeeps and asked the question.

2005JGC 07-18-2011 03:27 PM

Re: codes P0731,P0732,P0734
check the level of your transmission fluid. this could be an issue with a speed sensor, possibly. we would need to know how it drives as frango has already suggested.

Frango100 07-28-2011 06:42 PM

Re: codes P0731,P0732,P0734

Lurbin 07-18-2013 11:31 AM

Re: codes P0731,P0732,P0734
Frango, Maybe you can help, I have a 2005 Jeep Liberty Renegade 4WD which was having issues with 2nd, 3rd & 4th gear. It started sliping a while back, so I changed the tranny fluid and filter and it stopped sliping for about two days. then 4th gear only started sliping again. One thing I noticed you mentioned that the filter seal has to be put in first, the jeep has an oring seal, which i did not put it in first, but installed it with the filter and pushed it in. I turned the over drive off and the Jeep drives fine, the only thing is that I can hit more than 55 mph since 4th gear does not work when the OD is off. Any advice? Also I am getting codes P0700 & P0734 incorrect 4th gear ratio.

Frango100 07-18-2013 09:34 PM

Re: codes P0731,P0732,P0734
Welcome to the garage.
Do you know which transmission your jeep has?
If the seal, which i was talking about, came loose, the transmission oil pump would loose its prime and none of the gears would work anymore.
Did you really feel/see that the transmission was slipping?
A slipping transmission in several gears can have to do with a (too) low line pressure. Continue driving like this will cause premature wear to the respective clutch packs and will need a complete overhaul when not repaired soon.
But first need to know which transmission your jeep has before i can try to help further.
P0700 code means that the Transmission Control Module (TCM) has set a fault code. You will need a scanner to read the TCM faults, which will help in the trouble shooting and fault rectification.

All times are GMT -5. The time now is 07:49 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community