I have 2000 grand cherokee jeep 3.1 td, and it stuck in "limp mode", two local garages have tried there diagnostic cmputers on it, but can not find a fault with it

Yes, that is the whole idea of Limp Mode. It limits you to first and second gear so you can limp slowly to the nearest garage without causing catastrophic damage to the engine. What you need to do is connect a good quality DTC code reader scan tool and see the real reason that Limp Mode has been engaged.

https://www.google.com/search?q=1999+jeep+cherokee+limp+mode+causes

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Grand Cherokee, ? left off GRAND?

NO COUNTRY TOLD AT ALL, I had 1999 gas, in USA, so yah.
AND PARTS ARE SOLD BEST IN YOUR COUNTRY NOT 12,000 MILES AWAY ,RIGHT?
THE DEALER OF your car has the parts, ask them.
sounds like you have car sold in another country new
and the car is not there now, and no Jeep dealers in town?
bingo, off grid, a in jeep.

3.1L , 5 cylinders?
but did bingo on Grand (WG) model. I hAVE THE BOOK ON THIS.
Jeep Grand Cherokee (WG) (2001); WG (Europe) model w/ 3.1L Diesel (not in USA 2000) no 3.1 sold or part stores with it.
only outside USA has these parts, CKP sensor

I do have a real shop manual on the WG.
WG manual words
"The engine speed sensor is mounted to the trans-
Fig. 4 Engine Speed Sensor Location
mission bellhousing at the right/rear side of the
engine block (Fig. 4) it is a flywheel sensor.

(A FLY tone wheel /RELUCTOR DEVICE.)
seen from rear of bell at 1pm location
2 screws hold it down SEEN IN MANUAL OF CAR.
now the P/N
then who sells it we google earth for this part
YES RARE PARTS SELLER, I see youR problem on this.

engine is from Motori VM m maker. 531 OHV
V.M. VANCINI MOTORI Motor VM 531 OHV - 3.1
I see one in Italy on youtube.

Jeep Grand Cherokee (WJ) (1999-2000) w/ 3.1L Diesel engine.
Jeep Grand Cherokee Diesel 3.1L LTD (TD A) Turbo 1999 Mk II
I say ask UK, THIS SITE DOES LIST 3.1L

http://www.jeepchryslerparts.co.uk/shop/jeep/grand-cherokee/1999-2004-wj-wg/engine/3-1-td/1/jeep.html?symbol=&nazwa=ckp

One of the accelerator position sensors may be bad putting it into limp home mode . Have it scanned for codes and post them here .

when vehicle is shut off then restarted it will come out of limp mode. if problem is still there it will go back into limp mode. check for codes

Limp mode will reset by itself once the problem that caused the system to trigger the mode is repaired. You must have the Powertrain control module scanned there will be fault codes in memory. Once the codes are read then diagnostics are performed for each code and repairs made based on the findings.

According with the parts ans jobs there, sound like a electrical problem or harnesses connections problem; Jeep DTC P1652 is refer at J1850 Communication Bus short to ground.

The J1850 Connector is the connector that you plug the OBDII Scan tool into. It is located under the dash facing the driver's seat (generally). Sometimes this occurs under "unauthorized reset" condition.

HERE you have additional details. In order to solve it, you will need visit your local Jeep dealer.

I know that isnt good news, but hope this helps.

code p 0340 refers to cam shaft position sensor(CMP) sensor A bank 1--circuit malfunction====causes --wiring-- CMP sensor-- ECM
code p 0700 refers to transmission control system/ MIL--malfunction===causes --wiring---TCM
parts are available on line from e-bay , wreckers , junk yards manufacturer spares departments and would be delivered within 30 days so why are you waiting 7 months to get parts

Hi, Your like your jeep is in limp in mode, this is to keep you from burning up transmission and to get you some were off the road, the p1768 code means A/T Transmission Relay Output Always Off. This should be checked out by your local shop or dealer. but you should make sure that the fluid level is correct, if to low there is not enough fluid pressure for the solenoid's to engage the relays. Hope this can help you out. If i can help you anymore fell free to re post.
Thanks dodge tec

i have this same problem with my jeep. i am going to change the shift solenoid out.

What exactly is it doing? 1995 Grand cherokee doesn't have a limp mode for the transmission.