What are the common causes of P0551?

A drifting power steering pressure sensor. A corroded connector at the sensor. A failing power steering pump. A low fluid level. An incorrect sensor installed.

Read the pressure sensor signal on a scan tool. Check the fluid level and condition. Inspect the sensor connector and wiring. Test the pump for weak output. Replace the sensor if the signal drifts. Clear the code and retest.

P0551

Power Steering Pressure Sensor/Switch Circuit Range/Performance

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P0551 means Power Steering Pressure Sensor/Switch Circuit Range/Performance.

Where it lives

For P0551, the description names the sensor as the part involved.

Check these first

A drifting power steering pressure sensor
A corroded connector at the sensor
A failing power steering pump
A low fluid level
An incorrect sensor installed

What to do next

Read the pressure sensor signal on a scan tool
Check the fluid level and condition
Inspect the sensor connector and wiring
Test the pump for weak output
Replace the sensor if the signal drifts
Clear the code and retest

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

Generic SAE J2012 definition. Last updated 2026-10-10.