Code P057, Shorted Transaxle Temperature Sensor Circuit: Action

PCM turns on MIL. PCM substitutes engine coolant temperature value for transaxle temperature until engine coolant temperature reaches 221°F (105°C), then transaxle will be set to hot mode operation.

1. If transaxle temperature sensor is shorted, PCM data PD19 should read 298°F (148°C) or greater. If parameter does not show this, then sensor and circuit are okay. Fault is intermittent.
2. Checks circuit No. 585 for short. If parameter value stays at -18°F(-28°C) or greater with transaxle connector unplugged, check for short in circuit No. 585, PCM terminal 3F12 or transaxle connector terminal "F".
3. Checks circuits No. 585 for short to ground inside transaxle. If wiring is okay, replace shorted transaxle temperature sensor.

Fig 1: Code P057 Schematic (DeVille)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code P057 Flow Chart (DeVille)

Courtesy of GENERAL MOTORS CORP.