P0550 Code - Power Steering Pressure Sensor Circuit Malfunction

What Does P0550 Mean?

Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load. This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the voltage signal to the Engine Control Module (ECM). The ECM controls the electric throttle control actuator and adjusts the throttle valve opening angle to increase the engine speed and adjusts the idle speed for the increased load.

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What are the common causes of P0550 ?

One or more of the following faults may cause this DTC:

• A bad PSP sensor
• Damage or a short or open in the PSP sensor wiring
• Loose or damaged PSP sensor connectors
• Bad or incorrect power steering fluid
• A power steering fluid leak
• A faulty power steering pump
• Rack and pinion failure

How do you troubleshoot P0550 ?

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.



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