A check engine, transmission, or flashing overdrive light may indicate that the vehicle has detected a fault. The meaning depends on the vehicle and the specific indicator; some overdrive indicators simply show a selected setting.
A scan helps identify stored codes, but additional tests may be needed to establish the cause. Do not assume a warning means the transmission must be replaced.
Contact Certified Transmission in Bellevue with the exact message. If a warning flashes with rough running, overheating, or loss of drive, stop safely and seek assistance.