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Home >> GMC >> 1994 >> Yukon 6.5 S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Electronic Transmission >> Trouble Code Charts >> Code 73, Pressure Control Solenoid (Current Error) >> Notes
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Code 73, Pressure Control Solenoid (Current Error): Notes

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

The pressure control solenoid, is a PCM/TCM-controlled device used to regulate transmission line pressure. The PCM/TCM looks at TPS voltage, engine RPM and other inputs to determine appropriate line pressure for a given load, then regulates the pressure by applying a varying amperage. The applied amperage can vary from 1 to 1.1 amps. The PCM/TCM then monitors amperage at the return line.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Checks the ability of the PCM/TCM to command the solenoid.
  2. Checks internal transmission harness and solenoid for incorrect resistance.
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