Code Definition

P0550 — Power Steering Pressure Sensor Circuit Malfunction

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0550

P0550 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0550 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0550 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0550 fault code is set when the Engine Control Module (ECM) detects a malfunction in the circuit of the power steering pressure sensor. This sensor plays a crucial role in the vehicle's power steering system by monitoring the hydraulic pressure in the system. The pressure readings are used by the ECM to adjust the power steering assist level, ensuring smooth and responsive steering. A malfunction in this sensor's circuit can lead to issues with the power steering system, such as irregular steering assist, increased steering effort, or activation of power steering warning lights. Causes fo...

Join TaT to view the complete code information and diagnostic details.

Quick Facts