Code 73 - Force Motor Current: Notes

Fig 1: Code 73 Circuit Diagram

Courtesy of GENERAL MOTORS CORP.

PCM/TCM monitors signal return amperage. If return amperage varies more than .16 amp from amperage sent by PCM/TCM, Code 73 will be set. If this occurs, force motor is disabled, and maximum line pressure occurs.

NOTE: Test numbers refer to numbers on diagnostic chart.

This step checks control of force motor by PCM/TCM.
Voltage should be present.
This step checks if problem is inside transmission.
This step checks for short to ground.
This step checks for high resistance inside transmission.