The most common reason behind a faulty OEM speedometer is electrical issues within the automobile. However, it could also be a wide range of other reasons:

Defective speed sensor
Malfunction in the engine control unit (ECU)
Electrical wiring or blown fuse
To properly diagnose a speedometer, your trusted technicians at Scruggs Automotive will use several methods. Our expert team will begin with checking the sensor and all potential related wiring and fuses. If these are not the problem, they will use a high-tech scanner to read the error code. The scanner is the same tool often utilized to read Check Engine Lights

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