C0154 moderate

Power Steering Fluid Pressure Sensor Circuit Malfunction

The C0154 code means the vehicle's onboard diagnostic system has detected: Power Steering Fluid Pressure Sensor Circuit Malfunction. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $50 - $400 (parts and labor)

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Common Symptoms

Power steering warning light on
Engine idle surges when steering
Steering pump noise at full lock
Hard steering at low speeds
Power steering fluid foaming

Probable Causes (Ranked by Likelihood)

Failed power steering pressure sensor Very High
Low power steering fluid level High
Air in power steering system Moderate
Corroded sensor connector Low

Step-by-Step Diagnostic Procedure

Check power steering fluid level and condition
Inspect pressure sensor connector for corrosion
Read pressure sensor data with scan tool
Test sensor resistance and compare to specs
Bleed power steering system of air

Frequently Asked Questions

What does the power steering pressure sensor do?

It monitors hydraulic pressure in the power steering system. The engine computer uses this data to increase idle speed when steering effort is high to prevent stalling.

Why does my engine idle change when I turn the wheel?

The power steering pump puts a load on the engine during turns. The pressure sensor signals the engine computer to increase idle RPM to compensate. If the sensor fails, the engine may stall or surge.

Is this sensor only on hydraulic power steering systems?

Yes. Vehicles with electric power steering do not have a hydraulic pressure sensor. This code applies to vehicles with traditional hydraulic power steering systems.