A flashing check engine light does not necessarily indicate transmission trouble on its own. However, it is possible for transmission issues to trigger a flashing check engine light if they are severe enough or if they affect the engine's performance. Here are a few scenarios where a flashing check engine light may be related to transmission problems: - Severe Engine Misfire: A misfire in the engine can sometimes be caused by transmission-related issues, such as a faulty torque converter or a transmission control module malfunction. If the misfire is severe enough, the check engine light may flash. - Transmission Overheating: If the transmission is overheating due to a malfunctioning cooling system, low fluid levels, or a faulty transmission fluid pump, it can lead to engine performance issues. These issues can trigger a flashing check engine light. - Transmission Sensor Issues: Faulty transmission sensors, such as the speed sensor or shift solenoids, can cause irregularities in transmission operation. In turn, this can affect engine performance and potentially lead to a flashing check engine light.