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

WARNING: This page is about a different car, the 1995 GMC Sonoma and 1995 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This flow chart requires the use of a bidirectional (Tech 1) scan tester.

Pressure control solenoid is controlled by control module to regulate transmission line pressure. Control module looks at TPS voltage, engine RPM and other inputs to determine appropriate line pressure for a given load, then regulates pressure by applying a varying amperage. Applied amperage can vary from 1 to 1.1 amps. Control module then monitors amperage at return line.

NOTE: Test numbers refer to numbers on diagnostic chart.

Checks ability of control module to command solenoid.
Checks internal transmission harness and solenoid for incorrect resistance.