If the odometer display is completely blank, that is usually caused by bad solder connections on the instrument cluster. If there's all dashes in the display, that is caused by a problem in the Body Computer.
The mileage is recorded in the Engine Computer but that is not involved with the dash display. It is only used to record how long ago a diagnostic fault code was set. It can be changed with a scanner if it is not correct.
If you replace the cluster with a used one I'm pretty sure it is going to show the mileage that was on the other car. On some the mileage is stored in the Body Computer but I can never remember which is which.
The reason I brought up the factory anti-theft system is that is involved with the Body Computer AND the Engine Computer. If your car has that system you can use any used computers. If a used Body Computer or a used Engine Computer without that programming is installed, it will learn that programming from the other one as soon as you turn on the ignition switch. At that point, however, that upgraded programming can not be undone. If you put either upgraded computer into a car that doesn't have the factory anti-theft system, it will teach that programming to the other computer, then the engine will not start because both of them are waiting for a "disarm" signal that will never come. At that point you will have to replace both computers at the same time before turning on the ignition switch.
Also, when replacing the Engine Computer you have to use the Chrysler scanner to enter the four-digit PIN number. If you don't know it you have to get it through the dealer with your vehicle ID number. The engine won't start until the right number is entered.
Wednesday, May 1st, 2013 AT 5:14 PM