Code 73, Pressure Control Solenoid (Current Error): Notes

The pressure control solenoid is a PCM-controlled device used to regulate transmission line pressure. The PCM looks at TPS voltage, engine RPM and other inputs to determine the appropriate line pressure for a given load, then regulates the pressure by applying a variable amperage to the pressure control solenoid. Applied amperage varies from .1 to 1.1 amps.

The PCM then monitors the amperage at the return line. If the return amperage varies greater than .16 amp from the commanded amperage for at least one second, Code 73 will set. When Code 73 sets, the full line pressure will be applied, causing harsh shifts until the next ignition cycle. The code will remain stored in memory, and the pressure control solenoid will resume normal operation until conditions for the code reoccur.

NOTE: Test numbers refer to numbers on diagnostic chart.

This test checks ability of PCM to command pressure control solenoid.
This test checks for voltage at PCM.
This test checks internal transmission harness and pressure control solenoid for low resistance.
This test checks internal transmission harness and pressure control solenoid for high resistance.