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There is far too much involved in the troubleshooting job than what can be explained here in a reasonable amount of time. You will need to use the search function and read, read, read. It would help to get your year and make and anything else that is not working such as speedo, odometer, cruise control etc. Could be any one of two different speed sensors, the module, or a few other sensors. You will need to supply a lot more info than you have here.