If you're having issues with the speedometer or odometer, the problem lies within the electronic components, not a physical cable. This could include:
* Vehicle Speed Sensor (VSS): This sensor is the most likely culprit. It's located on the transmission.
* Wiring harness: Damage or corrosion to the wiring connecting the VSS to the instrument cluster.
* Instrument Cluster (Gauge Cluster): A faulty instrument cluster itself can cause speedometer/odometer malfunctions.
* PCM (Powertrain Control Module): In rare cases, the PCM might contribute to the problem.
To diagnose the issue, you'll need to have a mechanic check the VSS and the wiring harness first, and possibly use a scan tool to read any diagnostic trouble codes (DTCs) stored in the PCM.