Digital Speedometer Problems

Written by andrea stein
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Digital Speedometer Problems
Digital speedometers indicate a vehicle's speed, but can develop problems. (luxury car - model toy car image by alma_sacra from

Digital speedometers refer to speedometers, or gauges designed to read the speed of a land vehicle via a digital readout as opposed to an analogue gauge. Digital speedometers can develop problems for numerous reasons, most of which can be resolved by following some basic troubleshooting techniques.

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Loose Connection

A reading that fluctuates, decreasing or increasing in number even when the engine's rpm remains stable, often results from a loose cable connection. Check to ensure the cable that runs from the engine interior to the speedometer is secure and fasten it as needed.

Speed Sensors

A faulty speed sensor, which detects the speed of the wheel's rotation, may fail to send correct signals to the digital speedometer, resulting in faulty gauge readings, or no readings at all. Replacing the faulty speed sensor typically restores proper digital speedometer function.

Faulty Speedometer

The speedometer itself may be faulty, resulting in incorrect gauge readings. Drivers can verify the speedometer's reading by using a portable speedometer while driving the vehicle. A significant difference between the readings of the two speedometers typically indicates the installed speedometer is faulty and requires replacement.

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