Just like your vehicle's engine, in most modern vehicles transmissions are controlled by on board computers. When a malfunction occurs your vehicle's computer will store a code, relative to the problem, and will warn you with a light on your console.Sometimes the Overdrive light is flashing, this points directly at a transmission malfunction. Needless to say these warnings should not be ignored. Early diagnosis, by a qualified transmission technician with the proper equipment at our Benchmark Transmission shop, can save you money and prevent you from getting stranded on the road. Benchmark Transmission has the equipment and trained technicians to help you when this occurs. And the check engine light service is Free. Thats right, free check engine light scan.