Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC 73, Pressure Control Solenoid Circuit (Current Error): Notes
Pressure control solenoid is a PCM-controlled device used to regulate transmission line pressure. PCM compares TP voltage, engine RPM and other inputs to determine line pressure appropriate for a given load. PCM will regulate pressure by applying a varying amperage to pressure control solenoid. The applied amperage can vary from .1-1.1 amp. PCM then monitors amperage at the return line. DTC 73 will set when return amperage varies greater than .16 amp from commanded amperage for at least one second and DTC 75 is not set.
PCM will default to full line pressure being applied, causing harsh shifts. DTC 73 will be stored in PCM memory but will not turn on MIL.
- This test checks PCM's ability to command pressure control solenoid.
- This test checks internal transmission harness and pressure control solenoid for correct resistance.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.