What make , model , an year ? Probably the instrument cluster is bad or the stepper motor that controls it ! The istrument cluster gets the speed info from the PCM - engine computer ! PCM sends a message over the serial data bus (communication network for modules ) > Does the vehicle shift gears good ? VSS - vehicle speed sensor is input to PCM for vehicle speed ! A professional grade scan tool would be used to check for VSS input to PCM an speed message to instrument cluster ! This is a short cut to diagnose problem . You best bet would be to take your vehicle to a qualified repair shop an have it diagnosed !
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What make , model , an year ? Probably the instrument cluster is bad or the stepper motor that controls it ! The istrument cluster gets the speed info from the PCM - engine computer ! PCM sends a message over the serial data bus (communication network for modules ) > Does the vehicle shift gears good ? VSS - vehicle speed sensor is input to PCM for vehicle speed ! A professional grade scan tool would be used to check for VSS input to PCM an speed message to instrument cluster ! This is a short cut to diagnose problem . You best bet would be to take your vehicle to a qualified repair shop an have it diagnosed !