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They both work off of the same cable, so I would say that you have a problem in the speedometer head itself and will need replacing or sent in for repair.
Go to AutoZone, Advanced Auto Parts, or NAPA to use their Diagnostic Code Reader and get codes and they will tell you problem and parts needed to repaird.
The sensor is usually located at the passenger side axel near the wheel drum. It works by sending a signal to the PCM at the exact velocity. I think it is the sensor.
This model car should have a speed sensore on the trans. The wires go from their to the back of the speedodometer. 99% of the time its the speed sensore.
GM had gauge cluster problems from 2000-2005.Bad stepper motors.On those units you have to replace the cluster or rebuild it with new stepper motors.Dealership fixed mine for $150.00
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