Toyota Avalon hesitation at 40 mph despite transmission replacement on Toyota Avalon

Some Toyota Avalon owners report experiencing hesitation at 40 mph even after a transmission replacement, indicating potential ongoing transmission issues despite previous maintenance efforts. These issues may include hard shifting, jerky movements, and delayed responses. Additionally, some owners find that dirty or contaminated transmission fluid can lead to poor lubrication, causing the transmission to struggle with smooth gear shifts, which may result in hesitation. Malfunctions in the Transmission Control Module (TCM) are also reported, as a damaged TCM can contribute to shifting problems and hesitation at certain speeds. Furthermore, some owners note that reprogramming the TCM can help alleviate shuddering sensations and hesitations during light throttle driving. Other factors, such as ECM calibration, throttle response, and torque converter problems, may also play a role in this hesitation issue. Therefore, it may be necessary for owners to further diagnose the specific causes and address various components to resolve the problem effectively.