Code P057, Shorted Transaxle Temperature Sensor Circuit: Notes
WARNING: This page is about a different car, the 1993 Cadillac Seville and 1993 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).