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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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.
Your speed sensor has failed. The vehicles speedometer is not cable controled, it's controled by a sensor in your transmission. It's a easy fix, but the new sensor is about $80 to $100 depending on where you get it.
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.