For some unknown reason my speedo is not engaging, but when ever I start the car to the first turn on the key ignition the [SES] flashes for a split second then the fan in the engine bay turns on like it's doing Check Code, but there is nothing making it do that,then as soon as I turn the car on, it runs fine, but the fan is constantly running and the speedometer is still non-responsive when driving, not quite sure what to do now?...has anyone ever had this happen to them?