Why did my Cruse Control and Speedometer stop working?

Hello, the cause of failure could be as simple as low reference voltage in the electrical system, coming from the battery itself. Ensure a known good battery that passes testing and is fully charged is in the vehicle. Other than that, testing will be required to find out what's going on specifically with your concern. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops