Transmission problems i was driving my 1999 jeep grand cherokee. it was driving fine and then the check engine light came on the transmission started shifting hard into different gears. i lost 1st gear and overdrive. these check engine codes came up: P0733 gear 3 ratio incorrect P0700: trans control malfunction P0734: gear 4 ratio incorrect P0731: gear 1 ratio incorrect.

the valve body may be the issue in transmission

i have you inspected the linkage?
Is this an automatic transmission?
Is this 4-wheel drive?
Have you checked the transmission fluid?
Best regards
Ck

its most likely a bad sensor. there are Many! have the dealer or autoparts store run a diagnostic.

Computer controlled transmissions can get confused at times, from my personal experience. If the problem doesn't happen again, I would ignore it. If it happens all the time, it's most likely the transmission computer. Other things could be the shift linkage, engine vacuum leak, speed sensor, etc... Hope this helps.

check and smell transmission fluid if it smell burned then you have a
problem developing in that area of your engine.

You need to have the vechicle scanned for codes.I believe you are going to limp in mode on the computer.Have them check all codes,transmmission and body along with engine.

P0700 means there is a transmission fault code in the transmission controller. Since the transmission controller doesn't have a light attached, it tells the engine controller to turn the light on using this code. You'll have to access the transmission controller to further diagnose the problem.

Your transmission apparently is not downshifting properly. From your description, it sounds as though it is in 2nd or 3rd gear, which is why it is slow to accelerate. When you shift into 1st, it is starting off in 1st gear as it should. You probably should have a transmission shop check it out. Check engine light on?

Starter...if the starter is old, it is getting heat soaked. Replace the solenoid.

This is called limp mode chrysler did this to protect the transmission without leaving the owner stranded by the road,a few things will cause this mainly putting the wrong fluid in the transmission,they use only atf+4,or the govenor pressure sensor is acting up which should cause a check engine light to come on,or the transmission just needs a fluid and filter change,should be done every 2yrs or 36k miles,due the fluid and filter change about 40.00 but if you have the wrong fluid then the whole system needs to be flushed and refilled-transmission-torque convertor,radiator and cooler if equipped and all lines.