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.
Code 46: Power Steering Pressure Switch: Notes
PCM supplies and monitors a 12-volt signal on power steering pressure switch circuit. Pressure switch is normally closed, pulling 12-volt signal low. When power steering pressure exceeds 450 psi (kg/cm2 ), switch opens. Code 46 will set when vehicle speed is greater than 40 MPH and monitored circuit voltage is high (open) for more than 25 seconds.
- Tests for normal operation of power steering switch. "Scan" testers will display this information differently. Refer to manufacturer operating manual for additional information.
- If display does not change to normal (no pressure) when switch connector is removed, check for power steering switch signal circuit shorted to ground. If circuit is not shorted, ECM is faulty. If display changes to normal when switch connector is disconnected, switch is defective.
- Determines if fault is switch or circuit. A jumpered connector should cause high pressure to be displayed, indicating wiring and ECM are okay. If high pressure is indicated and Code 46 is present, switch or switch connector is faulty.
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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.