It can be faulty vehicle speed sensor .The sensor connects to the differential.The sensor in the transmission that tells the instrument panel how fast the transmission is turning. Sometimes that sensor breaks.
There is a speed sensor on the transmission that sends a signal to the
speedometer control on the back of the instrument cluster, and diagnosis is
pretty straightforward. The On-board Diagnostics Generation II (OBD II)
scan tools used by professional technicians should have the ability to read
the signal generated by the transmission speed sensor and therefore check
the function of the speed sensor. Even if the technician's scan tool does
not have this capability, the sensor can be checked with a volt meter at the
sensor itself.
If the sensor is putting out the proper signal, then the next step would be
to check the wiring between the speed sensor and the speedometer control by
checking the signal at the wire harness at the speedometer control. If the
signal is good, then the speedometer control is bad, and if the signal is
bad, then the wiring between the sensor and speedometer control is bad. The
most time confusing part of doing all these checks would be removing the
instrument cluster to get at the speedometer control, about a half-hour
total for all the checks.----------
If the needle moves you have a broken pinion or counter gear.If not,
then I would replace both speedometer cables.---------------Thank you.
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