On a recent trip, the speedometer went crazy then totally stopped working. the odometer stopped working which makes sense as
the computer thinks the vehicle isn't moving.
the engine light also came on. Auto Zone testing indicated it was the speedometer sensor.
I had similar problem with my 2002 Jeep Liberty when it was new. Speedometer went crazy when I turned on the heater. As i turned up the level of air, the speedometer was directly affected. Turned out it was a loose grounding wire in the dash, and the air pressure from the heater caused it to move and lose grounding. I would guess you have a loose wire somewhere. But on the plus side, you aren't putting as many miles on your odometer...
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The odometer is an electronic digital display. Digits displayed are illuminated by the odometer backlight bulb. The odometer backlight bulb brightness is controlled by class 2 messages from the BCM to adjust the display for daylight and instrument panel dimming operation. The trip odometer and total odometer will show in this display area. The push button in the lower right side of the speedometer is used to toggle between the trip and total odometer readings. To reset the trip odometer, push and hold the button down for at least two seconds. The total odometer display has six digits with no decimal display. The trip odometer has four digits including a decimal point and indicates tenths of a mile or kilometer.
The body control module (BCM) stores the vehicle mileage. If the BCM fails, the cluster will display the last valid mileage that was sent before the BCM failed. For replacement of the BCM refer to the BCM section of this service manual. Replacement instrument clusters do not require odometer pre-setting before installation. If the instrument cluster is replaced, the mileage stored in the BCM will be sent to the new cluster via serial data, and shown in the odometer display.
Your best bet , take it to a qualified repair shop.
These are common for the instument clusters to go bad. There are places that can rebuild it or you may have to replace it all together. There is a self test you can run by: key off, push and hold odometer/trip button and then turn the key on while holding the button *don't start it though*, then release the button and it will automatically start the self test. It will show a series of digits and then the software version #. After 5 beep tones it will automatically exit the self test mode. During the test, you can observe the speedo and fuel gauges to see if they are working.
Jeep Liberty 2002 woahs ! by porth21 - 2/1/09 7:35 AM In reply to: Jeep Liberty 2002 speedometer not working by Dannywon I have a 2002 Jeep Liberty Limited with the same problem. The main problem I have found to be the routing of the speed sensor wires located on the rear difrential. They are 2 blue wires on my jeep and probably the same on yours. The problem is that they rub on the E-brake cable and once the wire is exposed they short and the speedometer and any other options running off they speed sensor quit working and that includes the tranny shift points and can cause the torque converter to not unlock and cause stalls. I am having the same problem for the third time and chrysler and jeep are both aware of the problem and unwilling to repair the problem or post a recall.