If your speedometer is not working, it means you can’t see how fast you’re driving, which is both unsafe and illegal. The issue may be mechanical (in vehicles with a cable-driven speedometer) or electronic (in modern vehicles using a speed sensor). An assessment will identify the cause and restore accurate speed readings.

What does it mean if the speedometer is not working?

This usually means there is a fault with the speedometer cable, vehicle speed sensor, wiring, or the instrument cluster. Without accurate speed readings, you risk fines, reduced safety, and potential damage to connected systems such as cruise control or transmission controls.

Common causes of speedometer failure

• Broken or frayed speedometer cable (in older vehicles)
• Faulty vehicle speed sensor (VSS)
• Blown fuse or wiring fault
• Faulty instrument cluster or gauge
• ECU (engine control unit) communication fault

Why do you need to fix this problem quickly?

Driving without a working speedometer makes it impossible to monitor your speed, which increases the risk of accidents and speeding tickets. It can also affect transmission shifting and cruise control in some vehicles.

How do you know when to get it checked?

You should book an inspection if:

• The speedometer shows no reading
• The needle jumps or behaves erratically
• Other systems like cruise control or odometer also stop working
• A Check Engine Light or speed sensor fault warning appears

What happens during an assessment?

A mechanic will:

1. Check the speedometer cable (if fitted) for wear or damage
2. Test the vehicle speed sensor and wiring
3. Inspect fuses, relays, and ECU connections
4. Check the instrument cluster for faults
5. Scan the ECU for diagnostic trouble codes
6. Advise on whether the repair requires cable, sensor, or cluster replacement

How much does it cost to fix?

Costs depend on the fault. A cable replacement may cost $200–$400. A speed sensor replacement is usually $250–$500. If the instrument cluster is faulty, repair or replacement can cost $500–$1,200+.

Is it unsafe to drive with a faulty speedometer?

Yes. Without knowing your speed, you risk accidents, fines, and possible damage to vehicle systems that rely on speed data. The issue should be repaired immediately.