Code 58, Transmission Temperature Sensor High Temperature: Notes

WARNING: This page is about a different car, the 1994 Cadillac Fleetwood. However, it is still accessible from the selected car via links, so may be relevant.

Temperature sensor is a 2 wire thermistor located in transaxle. This sensor operates in the same manner as engine coolant temperature sensor and intake air temperature sensor. PCM applies 5 volts to sensor on signal circuit. Voltage sensed at PCM signal circuit terminal will be high when trans fluid is cold and as fluid warms voltage signal will drop. A very low signal voltage indicates a high fluid temperature or a failure in sensor circuit. Normal fluid temperature range is between 167°F-212°F (75°C-100°C).

Code 58 will set when sensor indicates a temperature of 148°C or greater for 5 seconds. Malfunction Indicator Light (MIL) will illuminate and PCM will use a default sensor value of 90°C.

NOTE: Test numbers refer to numbers on diagnostic chart.

Checks for a short to ground or an out-of-calibration sensor.
Checks for an internal fault within the transmission by creating an open.