How do you repair a 2007 Jeep Cherokee that is in limp mode with active DTC code P2747 and the input speed sensor 2 is bad?

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

..

have vehicle scanned for trouble code

Here's the link and I'm sure you will get the solution of your problem
Jeep Grand Cherokee Service Repair Manual 2005 2006 2007 2008

no engine stated (answer "IN box, not ON" shooting from hip...
and no matching transmission stated, there are 2,
one is Mercedes. called Nag1,
my guess asking for Hubby or BF?
and he looks for it and cant find it, i bet or wants me to look so he dont have to?

the vin code on your car will tell you which transmission is there
and the tag on its side, tells the same thing.
no symptoms stated
no scanned DTC errors posted.
just easter egg hunts.
the free book WK is there. read it? USA only are you> ??????
http://jeepdied.com/books.html

ever heard of jeep online
here it is. posted 100s of times. in fact your exact question vast times here.
see that, page see it ask you what you have.
nobody here can guess. MB is NAG1, same box.
5-45rfe is different.


http://www.factorychryslerparts.com/productSearch.aspx?&ukey_make=1064&ukey_model=15529&modelYear=2006&ukey_category=0&ukey_driveline=0&ukey_trimlevel=0&ukey_modelRange=0&isOnSale=0&searchTerm=







the NAG1 2 speed sensors are here id 1 and 12
guess where this is?, , deep in side the box.


why post DTC errors.?


the 5-45rfe box is 2 outside sensors. see here clearly.

http://www.factorychryslerparts.com/products/Jeep/2006/Grand-Cherokee4x4--57L-Hemi-Multi-Displacement--5-Spd-Automatic-5-45RFE/SENSOR-Transmission-Input-Speed--Transmission-Output-Speed/4280857/04799061AB.html

the code means.
to do the tests listed in the fsm. book, not guess.
we do the tests, and find out if the cause in in the transmission
the TCM or the TCM sensors or the solenoid drivers or solenoids
or the actual transmission internals.
why guess? why ask folks to guess. who are blind.?
ever seen the book, and read , the chapter on A/t trans on car tests?
alldata.com or
free
wk jeep
here
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

official.
https://www.techauthority.com/en-US/Pages/FacetSearchResults.aspx?make=Jeep&year=2006&model=GRAND+CHEROKEE+BASE&engine=3.7L+MAGNUM+V6&producttype=Service+Manuals&ptCatId=3083

i guessed drive line... so....

the book hints at....
- Faulty Input Speed Sensor 2 ,.is dead.
- Input Speed Sensor harness is open or shorted
- Input Speed Sensor circuit poor electrical connection

The Input Speed Sensor 2 is one of the two hall effect speed sensors that are used by the Transmission Control Module (TCM) to calculate the transmissions turbine speed. Since the turbine speed could not be measured directly, two of the drive elements are measured. Two input speed sensors are required because both elements are not active in all gears.

It says ? what says? the SCAN TOOL>?

non GRAND, (no engine stated, so fail there 1st)

my guess is you have a DTC and forgot to post that. why do that?

the DTC is covered in the FSM manual, and shows what is failing.

why not read the FSM and do what it says to do?



ill no attempt to read the FSM for you,. and that vague error.

why not log in to alldata.com and stop guessing. at parts.

there is no reason to gue$$



my guess at he DTC,

P0500"

or was it the P07xx series, all A/T errors.



P1xxx codes are factory code, got them? need all codes, not just 1 of many. and using a real scan tool not some POS autozoned junk (free)



p0500 is ASE jargon (best ) is VSS sensors.

vehicle speed sensor.



the transmission TCM monitors many inputs, and if they are bad

it can NOT shift, one such sensor is SPEED. MPH or VSS

the tail shaft all all 42RE transmission has a tail rpm sensor

when dead the cars speedometer goes dead, and the TCM

is at a lost to shift to 2nd gear, if speed is 0 all day.

a hopeless deal there.



if the battery voltage is not over 15v, its not overcharging, running.

99 is a nice jeep, id fix mine, ive had many.



the tranny has 2 speed sensors.

the front sensor does not do MPH, its just engine tranny input RPM

there are 3 RPM sensor

Engine, RPM called, CKP

tranny input sensor that tells the TCM true clutch slip at all time

and if the TCC works or not.

the tail shaft is the true speed sensor, vehicle speed, it\'s on tail shaft.



my guess, is the tail sensor is bad and you replaced the front sensor

P-0715 is a bad input sensor

P0720 and up are output sensor errors.

the 500 , is the 3rd sensor, the tail shaft sensor that runs the speedo

1st google hit.

http://www.jeepsunlimited.com/forums/showthread.php?548105-P0500-Vehicle-Speed-Sensor-Malfunction



next time post real DTCs

so we can jump on the exact part and the simple tests





the beauty of 3 sensors, is the transmission runs better

shifts better

and the OBD2 diagnostics are dead nuts, accurate.

it can see illegal gear slips (bad clutch packs) in any gear

and tell you. one of the best there.are

if you had new car, with 9speed, good luck keeping that card house going.. really.

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

Bad battery, or bad ground. If thats not it put a code reader on it while its running in limp mode and see what she says.

which one?
if the rear transmission, it just is a conn, and 1 screw.
a 96 -2006 sure.
42RE transmission or what? there are 2.
why not post the DTC error so we can be on the same page,?
page 191 covers it here , under tranny

some cars have up to 4 speed sensors, 2 on engine and 2 in tranny.
so... guessing page p191 tail
there is also a backup sensor for that. so.....
post DTC error and WIN, speed sensors means zero.
my guys is net rumor told you trans shifts bad and is VSS bad?
or did you scan it and see a live error, DTC,
that be best, not rumors, (and do clean it and retest )

P0733=Gear 3 Incorrect Ratio
P0734=Gear 4 Incorrect Ratio,
your transmission is in "limp" mode,
Have the following sensors checked on the transmission,input sensor,output sensor,and speed sensor.
The transmission is not getting a signal from one of them,So it doesn't know how fast your going so it doesn't up shift.