Code P057, Shorted Transaxle Temperature Sensor Circuit: Notes
WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
Transaxle temperature sensor resistance decreases as sensor temperature increases. A high transaxle temperature will result in low signal voltage on circuit No. 585 (Tan/White wire). Code P057 sets when PCM sees a transaxle temperature reading of 298°F (148°C) or greater (.08 volt or less).