The most likely reason a speedometer stops working is a broken gear. Finding the problem involves removing the speedometer assembly from the vehicle and locating the problem piece. Replacements are available at dealerships, auto parts stores and online.Continue Reading
If the problem exists on a 2003 to 2007 GM vehicle, a faulty stepper motor is the likely cause of failure. GM's entire production line from these years uses the XC5.168 motor. There is a potential for the manufacturer to make repairs at no cost to the owner. While GM does not admit a problem with speedometers, a class action suit from 2007 requires the company to pay for repairs on certain models. The case alleges symptoms that include incorrect speedometer displays, nonworking speedometers and failure of the entire instrument panel.
Speedometer problems lead to dangerous driving issues. Drivers who are unaware of their driving speed often exceed the speed limits, a common cause of accidents. The lack of a proper functioning speedometer increases the likelihood of a speeding citation.
Issues with speedometers and their associated odometers affect new vehicle warranties. A 2007 lawsuit against Honda indicated the company's odometers read up to 3.75 percent fast. The settlement in the suit includes an extension of the manufacturer's drive-train warranty for owners of these vehicles.Learn more about Car Parts & Maintenance
Electronic speed limiters are engine control devices that interface with the engine control unit and speedometer of a vehicle and restrict engine functions once the vehicle reaches a certain predetermined speed. A speed limiter may restrict the airflow into the engine, the fuel supply of the engine or change the timing of the engine's ignition system to keep the vehicle from exceeding the predetermined speed limit imposed by the limiter.Full Answer >
According to Dictionary.com, a speedometer is an "instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled." Odometers date to as early as 15 B.C. in Rome. Automobiles manufactured before the 1990s use mechanical speedometers and odometers. The electronic speedometer and odometer give the manufacturer additional choices.Full Answer >
Bigger tires will cause your speedometer to register a speed that is slower than your actual speed. For example, if your speedometer says 35 miles per hour on 20-inch diameter tires, changing to 23-inch diameter tires will make your true speed 40.25 mph, even though your speedometer will still show 35 mph.Full Answer >
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 (ECU).Full Answer >