xjbones

alright, so when i drive my gfs grand cherokee in town it shifts fine and the od light off light stays off. when i drive it to the mountains and start going up hills the tranny starts to shift kind of hard. mostly my 2nd to third shift. after doing this for a while the od off light comes on and it will not shift into od. sometimes the check engine light will come on and sometimes it wont, yet no codes stored in the ecm? i can turn the jeep off and then back on and the od off light goes off and normal shifting is back til i go hit some more uphills. wtf? im confused...btw its a 4.0l, auto, and 249.....please help

ol"blue

What does it do when you push the "OD OFF" button? On my '97 ZJ the button lights up when pressed to disable OD, otherwise there is no light. And unless pressed, the button light will not come on. I have the 5.2 V8 and don't use OD when towing or on steep grades.

xjbones

i can push the button as many times as i want and it wont go off or shift into od. when it isnt acting up, i can push it on and off just fine. i never use the od off button though. only time i really drive it is to get parts for my cherokee

ol"blue

On that trans OD is 4th gear. The 4th gear solenoid may be sticking a little. How does the trans fluid look, it's color? It's level, and does it have a burnt smell to it? How many miles on Jeep, and has fluid/filter ever been changed?

xjbones

120k on the jeep. previous owner said tranny was rebuilt. tranny fluid didnt smell burnt b4 i did a pan down service. now has new filter and fluid...prob still the same. no unusual debris in the old fluid or filter.

ol"blue

Sorry, I'm at a loss. Wait for "seed" to get online. He's the ZJ/WJ expert and should be able to help you more.

xjbones

yeah i only know cherokees and aw4 auto's....thanks a bunch for the help though. ive run thru all i know!!!

seed

By doing the "on-off" with the key and watching the "OD" light for flashes,are you getting any TCM codes? Could be the OD solenoid but i don't know why the CEL is coming on also.

Did this start after you did the fluid/filter change?

xjbones

didnt know how to check for tcm codes...will do the koeo test and watch the light.

problem was b4 the fluid change

xjbones

no tcm codes stored.....im lost someone please save me

seed

Sounds like the OD solenoid or speed sensor. I doubt it would be the OD clutches or the TC. Is the kick down adjusted properly?

low temps or a bad TPS can also cause OD not to work

Found this little write up about how your trans works http://www.asashop.org/autoinc/july98/techtips.htm

xjbones

thanks for the info seed...i will let you know what i find....i have heard from alot of peeps that its prob the od solenoid!!! going that direction

kmitch80

sounds like you're having similar problems like me. There are 3 things to really check. The Governor pressure sensor, Governor pressure solenoid, both in the tranny pan, and if you replace one, replace them both! get them online for much cheaper than dealer. And check your tranny temp sensor. If he transmission reaches a certain temp, such as when you cimb hills it heats up, it will kick into LIMP mode, not allowing 1st or 4th gear. Im having similar issues of being stuck in LIMP mode. still not resolved, but im on to the next step. MOST times it resolved by changing solenoid and switch

xjbones

cool, thanks. if you figure it out before me, let me know what you find. have to wait for the pay check to get parts

kmitch80

hahaha. you sound like me. well i've noticed a few weird things on mine. But since i've replaced both sensor and solenoid, i'm thinking temp sensor, TCM, (hope not) or one of the speed sensors.