What symptom indicates potential transmission fluid overheating?

The symptom of a burned smell and dark discoloration in transmission fluid is a clear indicator of potential overheating of the transmission fluid. When the fluid overheats, it can break down chemically and lose its protective and lubricating properties. This degradation leads to a burned odor and a noticeable darkening in color, typically turning from a bright red to a darker shade. Overheating can be caused by excessive load, inadequate cooling, or low fluid levels, and recognizing these symptoms is crucial in preventing further damage to the transmission system. Addressing overheating promptly can help maintain the health and performance of the vehicle's transmission.