Tag Archives: DTC P0550 Chevrolet

DTC P0550 Power Steering Pressure Sensor Circuit Malfunction

A properly functioning power steering system is vital for ease of steering and vehicle control. When an issue arises within this system, it can lead to difficulties in steering your vehicle safely. Diagnostic Trouble Code (DTC) P0550 indicates a problem with the Power Steering Pressure Sensor Circuit. In this post, we will explore the meaning of DTC P0550, potential causes, symptoms you may encounter, and the steps for accurate diagnosis and resolution of this issue.

1. What Does P0550 Code Mean?

DTC P0550 signifies a malfunction within the Power Steering Pressure Sensor Circuit. This sensor is responsible for monitoring the pressure in the power steering system, providing valuable data to the vehicle’s computer to adjust the power steering assistance as needed.

2. What Are the Causes of DTC P0550?

Several factors can contribute to the occurrence of DTC P0550:

  • Faulty Power Steering Pressure Sensor: The sensor itself may be malfunctioning or damaged.
  • Wiring Issues: Problems with the wiring, such as frayed or corroded wires, can disrupt the sensor’s signal.
  • Connector Problems: Poor connections or damaged connectors related to the power steering pressure sensor can trigger this code.
  • Power Steering Pump Issues: Problems with the power steering pump, such as low fluid levels or pump failure, may indirectly affect the sensor’s readings.

3. What Are the Symptoms of DTC P0550?

Recognizing the symptoms associated with DTC P0550 is important for diagnosis. Common signs might include:

  • Difficulty Steering: You may experience increased effort required to steer the vehicle, particularly at lower speeds.
  • Power Steering Warning Light: The power steering warning light on your dashboard may illuminate.
  • Loss of Power Steering Assistance: In some cases, the power steering assistance may be completely lost, making steering extremely difficult.

4. How to Diagnose DTC P0550?

To accurately diagnose DTC P0550, follow these steps:

  • Use an OBD-II scanner to retrieve the trouble code and confirm the presence of DTC P0550.
  • Inspect the wiring and connectors associated with the power steering pressure sensor for any visible damage or corrosion. Repair or replace any damaged components as needed.
  • Test the power steering pressure sensor using a multimeter to check its resistance and voltage readings. Consult your vehicle’s service manual for specific values.
  • If the sensor appears to be functioning correctly, perform a comprehensive inspection of the power steering system, including the power steering pump and fluid levels, to identify any issues that may indirectly affect the sensor.

5. How to Fix DTC P0550 Problem?

Once you have identified and diagnosed the issue causing the Power Steering Pressure Sensor Circuit Malfunction (DTC P0550), it’s essential to address it effectively. Here’s what to do:

  • Replace the power steering pressure sensor if it is found to be faulty during testing.
  • Repair or replace any damaged wiring or connectors associated with the sensor.
  • Inspect the power steering pump and fluid levels, addressing any problems that may affect the sensor readings.
  • After making the necessary repairs, clear the trouble code using your OBD-II scanner to reset the power steering warning light.


DTC P0550 points to a malfunction within the Power Steering Pressure Sensor Circuit, which can result in difficulties while steering your vehicle. Understanding the meaning of this code, recognizing the symptoms, identifying potential causes, conducting systematic diagnosis, and applying effective solutions are essential for restoring the power steering system’s functionality and ensuring safe and smooth vehicle operation.