Posted on 9/26/2025
When the check engine light comes on, it’s easy to assume the problem lies under the hood. While that’s sometimes true, transmission issues, especially faulty sensors, are also a common cause. In modern vehicles, your transmission relies on several sensors to monitor speed, fluid pressure, and gear position. If any of these sensors fail or send inaccurate signals, the engine control module (ECM) may detect a problem and trigger the check engine light. Understanding how these sensors work and what happens when they fail can save you time, money, and unnecessary stress. How Transmission Sensors Communicate With Your Vehicle Modern automatic transmissions are highly complex, and sensors are at the heart of how they function. These sensors send constant data to the ECM, which uses the information to control gear shifts, manage torque, and optimize performance. When a sensor fails or provides inconsistent readings, the ECM can no longer make accurate adjustm ... read more