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Could be a loose cable (connection on the back of the speedometer). In today's electronics on cars it's best to take it to a mechanic who knows what they are doing for the repair. You might want to save the money, but if you mess something else up trying to fix the one thing it might cost you even more.

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7y ago
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7y ago

Faulty Vehicle Speed Sensor, faulty wiring, faulty input or output to the CECU (on certain vehicle types), faulty speedometer... you start by diagnosing to determine the cause of the problem, then you move on to how to repair it.

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7y ago

There are several common causes for a speedometer to stop working. Typically, these malfunctions are caused by an issue with a car's wiring, a broken gear in the speedometer system, a speed sensor issue or a faulty engine control unit.

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7y ago

Changing the tire size or changing the differential gear ratio changes the accuracy of the speedometer. The year, make and model vehicle will affect the answer especially if the speedometer is cable driven or electronic.

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Q: What makes a speedometer not read right and how do I repair?
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