WHAT DOES IT MEAN WHEN YOUR PERFORM SERVICE LIGHT COMES ON? I JUST BOUGHT MY JEEP USED AND DID NOT GET A BOOK WITH IT,

05 GC
i guess you lost the operators guide, as do most post here.
buy one?
its not an error, DTC are errors
the 05 that is a DO SERVICE light, all new cars have this.
the way it works is
you drive
lamp comes on
they do the service, and they turn it out
or you do it and then turn it out.

that simple.
so then you ask, how to turn it off.
answer, posted 1million times, (goggle it)

here ill type that for you, no problem.

https://www.google.com/webhp#q=turn+off+2005+jeep+service+light

easy huh?
or get the operators manual.
here it is for free.
down load it and keep it. (read it, it covers this 100%)
http://www.jeep.com/en/owners/manuals/

that signifies a code--u need a book that explains them--buy a haynes manual or go to library----codes r general--a data stream run will pinpoint issue- but use it as a 2nd aproach cause cost $$

The SERVICE PERFORMANCE light is to let you know you vehicle is due for maintenance service. The light is set to light by mileage not set because there is something wrong. Your owner's manual will have what maintenance service should be done. Or if you let me know how mileage is I can get the information. Here is the procedure for resetting the light.

If it is only "perform service", this is likely your mileage counter telling you to get an oil change. If it was a "check engine light" it would be amber in color and would require use of a scanner to acquire codes and check for faults. Here's how to reset:
On a 1997 Jeep Grand Cherokee Laredo if the "Perform Service" light is in the middle of the dash Simply press the "SET" button until the display shows the "0 miles to service", Then hold the other button below it down until it resets to "3000".

This service light comes on every 5000 miles and remind you of an oil change , after oil change has been done , the light suppose to be reset.
The scheduled services performed according to Maintanence Schedule , up on exeeded mileage.(usualy comes as separate booklet or as a part of owner manual book).

This is a oil change reminder. Nothing fancy about, when you get your oil change go into the menu and click reset counter and it will go off. If there was something wrong with your car the check engine light would come on.

On the jeep it is just an oil change reminder, you can go into the menu and reset the counter. If there was something wrong with the jeep the check engine light will come on.

hello. For starters you can take your jeep to any auto zone store, and they will put it on a scanner for free to let you know what your jeep's computer is indicating Many times the problem is that the sensor itself malfuntions, not that anything mechanical is wrong. good luck with it.

AND here is a free link for you to obtain the "book" about your jeep. take care.

http://www.wjjeeps.com/brochures2.htm

Yes, check to see if oil is dark or not. If dark change it, if not the light my mean you need tune up, plugs wires etc.

Press the step button until miles to service comes up, then press and hold the reset button.